Southwest Airlines flights from Denver (DEN) to Washington Dulles (IAD).

FLIGHT SCHEDULE
Direct Flights:
Tue,Wed 10:45 Denver (DEN) 15:55 Washington Dulles (IAD) Southwest Airlines WN 165 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-03-10 through 2026-04-01
Mon,Thu,Fri 10:55 Denver (DEN) 16:05 Washington Dulles (IAD) Southwest Airlines WN 165 Non-stop Boeing 737-700 (Scimitar Winglets) 3:10 Effective 2026-03-05 through 2026-04-06
Sat 10:55 Denver (DEN) 16:05 Washington Dulles (IAD) Southwest Airlines WN 165 Non-stop Boeing 737-800 (73H) 3:10 Effective 2026-03-07 through 2026-04-04
Sat 07:05 Denver (DEN) 12:25 Washington Dulles (IAD) Southwest Airlines WN 345 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-08-08 through 2026-09-26
Sun 08:15 Denver (DEN) 13:40 Washington Dulles (IAD) Southwest Airlines WN 345 Non-stop Boeing 737 MAX 8 (7M8) 3:25 Effective 2026-08-09 through 2026-09-27
Tue,Wed 09:25 Denver (DEN) 14:45 Washington Dulles (IAD) Southwest Airlines WN 345 Non-stop Boeing 737-800 (73H) 3:20 Effective 2026-08-04 through 2026-09-30
Mon,Thu,Fri 09:35 Denver (DEN) 15:00 Washington Dulles (IAD) Southwest Airlines WN 494 Non-stop Boeing 737 MAX 8 (7M8) 3:25 Effective 2026-08-06 through 2026-09-28
Mon,Tue,Fri,Sun 18:10 Denver (DEN) 23:25 Washington Dulles (IAD) Southwest Airlines WN 820 Non-stop Boeing 737-800 (73H) 3:15 Valid until 2026-01-04
Sat 19:45 Denver (DEN) 00:55 Washington Dulles (IAD) Southwest Airlines WN 820 Non-stop Boeing 737-800 (73H) 3:10 Valid until 2026-01-03 The flight arrives 1 day after departure.
Sat 17:35 Denver (DEN) 22:55 Washington Dulles (IAD) Southwest Airlines WN 1009 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-04-11 through 2026-05-30
Tue,Wed 18:10 Denver (DEN) 23:40 Washington Dulles (IAD) Southwest Airlines WN 1009 Non-stop Boeing 737 MAX 8 (7M8) 3:30 Effective 2026-04-07 through 2026-06-03
Sun 18:20 Denver (DEN) 23:45 Washington Dulles (IAD) Southwest Airlines WN 1009 Non-stop Boeing 737 MAX 8 (7M8) 3:25 Operates only on 2026-05-24
Mon,Thu,Fri 19:05 Denver (DEN) 00:20 Washington Dulles (IAD) Southwest Airlines WN 1009 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-04-09 through 2026-06-01 The flight arrives 1 day after departure.
Sun 19:25 Denver (DEN) 00:40 Washington Dulles (IAD) Southwest Airlines WN 1009 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-04-12 through 2026-05-17 The flight arrives 1 day after departure.
Sun 19:25 Denver (DEN) 00:40 Washington Dulles (IAD) Southwest Airlines WN 1009 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Operates only on 2026-05-31 The flight arrives 1 day after departure.
Sun 11:10 Denver (DEN) 16:20 Washington Dulles (IAD) Southwest Airlines WN 1397 Non-stop Boeing 737-700 (Scimitar Winglets) 3:10 Effective 2026-03-08 through 2026-04-05
Sat 17:05 Denver (DEN) 22:25 Washington Dulles (IAD) Southwest Airlines WN 1514 Non-stop Boeing 737-800 (73H) 3:20 Effective 2026-08-08 through 2026-09-26
Tue,Wed 17:55 Denver (DEN) 23:25 Washington Dulles (IAD) Southwest Airlines WN 1514 Non-stop Boeing 737-800 (73H) 3:30 Effective 2026-08-04 through 2026-09-30
Mon,Thu,Fri 18:00 Denver (DEN) 23:30 Washington Dulles (IAD) Southwest Airlines WN 1514 Non-stop Boeing 737-800 (73H) 3:30 Effective 2026-08-06 through 2026-09-28
Sun 18:50 Denver (DEN) 00:10 Washington Dulles (IAD) Southwest Airlines WN 1514 Non-stop Boeing 737-800 (73H) 3:20 Effective 2026-08-09 through 2026-09-27 The flight arrives 1 day after departure.
Mon,Tue,Fri,Sun 07:45 Denver (DEN) 13:05 Washington Dulles (IAD) Southwest Airlines WN 1762 Non-stop Boeing 737-800 (73H) 3:20 Valid until 2026-01-04
Mon 07:50 Denver (DEN) 13:10 Washington Dulles (IAD) Southwest Airlines WN 1762 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Operates only on 2026-01-05
Sat 10:20 Denver (DEN) 15:35 Washington Dulles (IAD) Southwest Airlines WN 1762 Non-stop Boeing 737-700 (Scimitar Winglets) 3:15 Operates only on 2026-01-03
Wed,Thu 17:00 Denver (DEN) 22:10 Washington Dulles (IAD) Southwest Airlines WN 1762 Non-stop Boeing 737-800 (73H) 3:10 Valid until 2026-01-01
Sun 10:25 Denver (DEN) 15:45 Washington Dulles (IAD) Southwest Airlines WN 1884 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-04-12 through 2026-05-17
Sun 10:25 Denver (DEN) 15:45 Washington Dulles (IAD) Southwest Airlines WN 1884 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Operates only on 2026-05-31
Mon,Thu,Fri 10:30 Denver (DEN) 15:50 Washington Dulles (IAD) Southwest Airlines WN 1884 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-04-09 through 2026-06-01
Sun 11:00 Denver (DEN) 16:15 Washington Dulles (IAD) Southwest Airlines WN 1884 Non-stop Boeing 737-800 (73H) 3:15 Operates only on 2026-05-24
Sat 11:10 Denver (DEN) 16:25 Washington Dulles (IAD) Southwest Airlines WN 1884 Non-stop Boeing 737-800 (73H) 3:15 Effective 2026-04-11 through 2026-05-30
Tue,Wed 11:30 Denver (DEN) 16:50 Washington Dulles (IAD) Southwest Airlines WN 1884 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-04-07 through 2026-06-03
Mon-Fri 16:45 Denver (DEN) 21:55 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-01-06 through 2026-01-14
Tue-Fri,Sun 16:45 Denver (DEN) 21:55 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-01-18 through 2026-01-23
Mon-Fri 16:45 Denver (DEN) 21:55 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-01-26 through 2026-02-04
Tue,Wed,Sun 16:45 Denver (DEN) 21:55 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-02-08 through 2026-02-11
Tue,Wed 16:45 Denver (DEN) 21:55 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-02-18 through 2026-03-04
Sat 17:00 Denver (DEN) 22:10 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-01-10 through 2026-02-07
Thu,Fri,Sun 17:25 Denver (DEN) 22:40 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-01-11 through 2026-01-16
Mon,Sun 17:25 Denver (DEN) 22:40 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-01-19 through 2026-01-25
Thu,Fri,Sun 17:25 Denver (DEN) 22:40 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-02-01 through 2026-02-06
Mon,Sun 17:25 Denver (DEN) 22:40 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-02-09 through 2026-02-15
Mon,Tue,Thu 17:25 Denver (DEN) 22:40 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Effective 2026-02-17 through 2026-02-23
Mon 17:25 Denver (DEN) 22:40 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:15 Operates only on 2026-03-02
Mon,Thu,Fri 17:50 Denver (DEN) 23:10 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-02-12 through 2026-02-16
Thu,Fri,Sun 17:50 Denver (DEN) 23:10 Washington Dulles (IAD) Southwest Airlines WN 2135 Non-stop Boeing 737 MAX 8 (7M8) 3:20 Effective 2026-02-20 through 2026-03-01
Mon 13:55 Denver (DEN) 19:05 Washington Dulles (IAD) Southwest Airlines WN 2474 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Operates only on 2026-01-05
Mon,Tue,Fri,Sun 14:00 Denver (DEN) 19:10 Washington Dulles (IAD) Southwest Airlines WN 2474 Non-stop Boeing 737-800 (73H) 3:10 Valid until 2026-01-04
Sat 18:25 Denver (DEN) 23:55 Washington Dulles (IAD) Southwest Airlines WN 2620 Non-stop Boeing 737 MAX 8 (7M8) 3:30 Effective 2026-06-06 through 2026-08-01
Mon,Thu,Fri,Sun 19:05 Denver (DEN) 00:30 Washington Dulles (IAD) Southwest Airlines WN 2620 Non-stop Boeing 737 MAX 8 (7M8) 3:25 Effective 2026-06-04 through 2026-08-03 The flight arrives 1 day after departure.
Tue,Wed 19:25 Denver (DEN) 00:50 Washington Dulles (IAD) Southwest Airlines WN 2620 Non-stop Boeing 737 MAX 8 (7M8) 3:25 Effective 2026-06-09 through 2026-07-29 The flight arrives 1 day after departure.
Sat 16:35 Denver (DEN) 21:45 Washington Dulles (IAD) Southwest Airlines WN 2658 Non-stop Boeing 737 MAX 8 (7M8) 3:10 Effective 2026-02-14 through 2026-02-28

1 2

A domestic route departing from the Denver airport (DEN) and arriving at Washington Dulles airport (IAD).
The flight distance is 1448 miles, or 2331 km.
The timezone of the departure airport is UTC-7 , and the timezone of the arrival airport is UTC-5 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 3:05 and 3:30.

Feedback - Disclaimer - Privacy

Southwest Airlines flights from Denver (DEN) to Washington Dulles (IAD).

FLIGHT SCHEDULE

Direct Flights:

Southwest Airlines WN165

10:45

Denver (DEN)

15:55

Washington Dulles (IAD)

Effective 2026-03-10 through 2026-04-01

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN165

10:55

Denver (DEN)

16:05

Washington Dulles (IAD)

Effective 2026-03-05 through 2026-04-06

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN165

10:55

Denver (DEN)

16:05

Washington Dulles (IAD)

Effective 2026-03-07 through 2026-04-04

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:10, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN345

07:05

Denver (DEN)

12:25

Washington Dulles (IAD)

Effective 2026-08-08 through 2026-09-26

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN345

08:15

Denver (DEN)

13:40

Washington Dulles (IAD)

Effective 2026-08-09 through 2026-09-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:25, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN345

09:25

Denver (DEN)

14:45

Washington Dulles (IAD)

Effective 2026-08-04 through 2026-09-30

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:20, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN494

09:35

Denver (DEN)

15:00

Washington Dulles (IAD)

Effective 2026-08-06 through 2026-09-28

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:25, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN820

18:10

Denver (DEN)

23:25

Washington Dulles (IAD)

Valid until 2026-01-04

Mon

Tue

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN820

19:45

Denver (DEN)

00:55(+1)

Washington Dulles (IAD)

Valid until 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:10, non-stop
Boeing 737-800 (73H)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN1009

17:35

Denver (DEN)

22:55

Washington Dulles (IAD)

Effective 2026-04-11 through 2026-05-30

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1009

18:10

Denver (DEN)

23:40

Washington Dulles (IAD)

Effective 2026-04-07 through 2026-06-03

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1009

18:20

Denver (DEN)

23:45

Washington Dulles (IAD)

Operates only on 2026-05-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:25, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1009

19:05

Denver (DEN)

00:20(+1)

Washington Dulles (IAD)

Effective 2026-04-09 through 2026-06-01

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN1009

19:25

Denver (DEN)

00:40(+1)

Washington Dulles (IAD)

Effective 2026-04-12 through 2026-05-17

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN1009

19:25

Denver (DEN)

00:40(+1)

Washington Dulles (IAD)

Operates only on 2026-05-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN1397

11:10

Denver (DEN)

16:20

Washington Dulles (IAD)

Effective 2026-03-08 through 2026-04-05

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:10, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN1514

17:05

Denver (DEN)

22:25

Washington Dulles (IAD)

Effective 2026-08-08 through 2026-09-26

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:20, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1514

17:55

Denver (DEN)

23:25

Washington Dulles (IAD)

Effective 2026-08-04 through 2026-09-30

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:30, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1514

18:00

Denver (DEN)

23:30

Washington Dulles (IAD)

Effective 2026-08-06 through 2026-09-28

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:30, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1514

18:50

Denver (DEN)

00:10(+1)

Washington Dulles (IAD)

Effective 2026-08-09 through 2026-09-27

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:20, non-stop
Boeing 737-800 (73H)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN1762

07:45

Denver (DEN)

13:05

Washington Dulles (IAD)

Valid until 2026-01-04

Mon

Tue

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 3:20, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1762

07:50

Denver (DEN)

13:10

Washington Dulles (IAD)

Operates only on 2026-01-05

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1762

10:20

Denver (DEN)

15:35

Washington Dulles (IAD)

Operates only on 2026-01-03

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:15, non-stop
Boeing 737-700 (Scimitar Winglets)

Direct Flights:

Southwest Airlines WN1762

17:00

Denver (DEN)

22:10

Washington Dulles (IAD)

Valid until 2026-01-01

Mon
-

Tue
-

Wed

Thu

Fri
-

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1884

10:25

Denver (DEN)

15:45

Washington Dulles (IAD)

Effective 2026-04-12 through 2026-05-17

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1884

10:25

Denver (DEN)

15:45

Washington Dulles (IAD)

Operates only on 2026-05-31

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1884

10:30

Denver (DEN)

15:50

Washington Dulles (IAD)

Effective 2026-04-09 through 2026-06-01

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN1884

11:00

Denver (DEN)

16:15

Washington Dulles (IAD)

Operates only on 2026-05-24

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1884

11:10

Denver (DEN)

16:25

Washington Dulles (IAD)

Effective 2026-04-11 through 2026-05-30

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:15, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN1884

11:30

Denver (DEN)

16:50

Washington Dulles (IAD)

Effective 2026-04-07 through 2026-06-03

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

16:45

Denver (DEN)

21:55

Washington Dulles (IAD)

Effective 2026-01-06 through 2026-01-14

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

16:45

Denver (DEN)

21:55

Washington Dulles (IAD)

Effective 2026-01-18 through 2026-01-23

Mon
-

Tue

Wed

Thu

Fri

Sat
-

Sun

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

16:45

Denver (DEN)

21:55

Washington Dulles (IAD)

Effective 2026-01-26 through 2026-02-04

Mon

Tue

Wed

Thu

Fri

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

16:45

Denver (DEN)

21:55

Washington Dulles (IAD)

Effective 2026-02-08 through 2026-02-11

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

16:45

Denver (DEN)

21:55

Washington Dulles (IAD)

Effective 2026-02-18 through 2026-03-04

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:00

Denver (DEN)

22:10

Washington Dulles (IAD)

Effective 2026-01-10 through 2026-02-07

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:25

Denver (DEN)

22:40

Washington Dulles (IAD)

Effective 2026-01-11 through 2026-01-16

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:25

Denver (DEN)

22:40

Washington Dulles (IAD)

Effective 2026-01-19 through 2026-01-25

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:25

Denver (DEN)

22:40

Washington Dulles (IAD)

Effective 2026-02-01 through 2026-02-06

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:25

Denver (DEN)

22:40

Washington Dulles (IAD)

Effective 2026-02-09 through 2026-02-15

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:25

Denver (DEN)

22:40

Washington Dulles (IAD)

Effective 2026-02-17 through 2026-02-23

Mon

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:25

Denver (DEN)

22:40

Washington Dulles (IAD)

Operates only on 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:15, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:50

Denver (DEN)

23:10

Washington Dulles (IAD)

Effective 2026-02-12 through 2026-02-16

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2135

17:50

Denver (DEN)

23:10

Washington Dulles (IAD)

Effective 2026-02-20 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 3:20, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2474

13:55

Denver (DEN)

19:05

Washington Dulles (IAD)

Operates only on 2026-01-05

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2474

14:00

Denver (DEN)

19:10

Washington Dulles (IAD)

Valid until 2026-01-04

Mon

Tue

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 3:10, non-stop
Boeing 737-800 (73H)

Direct Flights:

Southwest Airlines WN2620

18:25

Denver (DEN)

23:55

Washington Dulles (IAD)

Effective 2026-06-06 through 2026-08-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:30, non-stop
Boeing 737 MAX 8 (7M8)

Direct Flights:

Southwest Airlines WN2620

19:05

Denver (DEN)

00:30(+1)

Washington Dulles (IAD)

Effective 2026-06-04 through 2026-08-03

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 3:25, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN2620

19:25

Denver (DEN)

00:50(+1)

Washington Dulles (IAD)

Effective 2026-06-09 through 2026-07-29

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 3:25, non-stop
Boeing 737 MAX 8 (7M8)
The flight arrives 1 day after departure.

Direct Flights:

Southwest Airlines WN2658

16:35

Denver (DEN)

21:45

Washington Dulles (IAD)

Effective 2026-02-14 through 2026-02-28

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 3:10, non-stop
Boeing 737 MAX 8 (7M8)

Page 1 / 2 next

A domestic route departing from the Denver airport (DEN) and arriving at Washington Dulles airport (IAD).
The flight distance is 1448 miles, or 2331 km.
The timezone of the departure airport is UTC-7 , and the timezone of the arrival airport is UTC-5 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
For direct flights, the flight time varies between 3:05 and 3:30.

All DEN-IAD flights

All Southwest Airlines flights

Return (IAD-DEN) flights

Feedback - Disclaimer - Privacy