ITA Airways flights from Denver (DEN) to Washington Dulles (IAD).

Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Tue,Thu,Sun 10:20 Denver (DEN) 15:44 Washington Dulles (IAD)
ITA Airways AZ 4374 Non-stop Boeing 737-900 (739) 3:24 Effective 2026-03-08 through 2026-03-26
Codeshare flight, operated by United Airlines.(UA 326)
Sun 06:00 Denver (DEN) 11:20 Washington Dulles (IAD)
ITA Airways AZ 4375 Non-stop Boeing 737 MAX 9 (7M9) 3:20 Operates only on 2026-03-01
Codeshare flight, operated by United Airlines.(UA 1279)
Tue,Fri-Sun 06:00 Denver (DEN) 11:29 Washington Dulles (IAD)
ITA Airways AZ 4375 Non-stop Boeing 737-900 (739) 3:29 Effective 2026-03-29 through 2026-04-28
Codeshare flight, operated by United Airlines.(UA 1279)
Tue,Fri-Sun 06:00 Denver (DEN) 11:14 Washington Dulles (IAD)
ITA Airways AZ 4375 Non-stop Boeing 737-900 (739) 3:14 Effective 2026-05-01 through 2026-05-31
Codeshare flight, operated by United Airlines.(UA 1279)
Daily 06:00 Denver (DEN) 11:14 Washington Dulles (IAD)
ITA Airways AZ 4375 Non-stop Boeing 737-900 (739) 3:14 Effective 2026-06-01 through 2026-09-29
Codeshare flight, operated by United Airlines.(UA 1279)
Tue,Fri-Sun 06:00 Denver (DEN) 11:14 Washington Dulles (IAD)
ITA Airways AZ 4375 Non-stop Boeing 737-900 (739) 3:14 Effective 2026-10-02 through 2026-10-24
Codeshare flight, operated by United Airlines.(UA 1279)
Thu 06:10 Denver (DEN) 11:30 Washington Dulles (IAD)
ITA Airways AZ 4375 Non-stop Boeing 757-200 (752) 3:20 Operates only on 2026-03-05
Codeshare flight, operated by United Airlines.(UA 1279)
Tue,Thu,Sun 07:45 Denver (DEN) 13:05 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Boeing 737-900 (739) 3:20 Effective 2026-03-01 through 2026-03-05
Codeshare flight, operated by United Airlines.(UA 351)
Tue,Thu 07:45 Denver (DEN) 13:05 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Boeing 737-900 (739) 3:20 Effective 2026-03-10 through 2026-03-26
Codeshare flight, operated by United Airlines.(UA 351)
Sun 07:45 Denver (DEN) 13:07 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Airbus A321neo (32Q) 3:22 Effective 2026-03-15 through 2026-03-22
Codeshare flight, operated by United Airlines.(UA 1101)
Tue,Fri-Sun 07:45 Denver (DEN) 13:14 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Boeing 737-900 (739) 3:29 Effective 2026-03-29 through 2026-04-28
Codeshare flight, operated by United Airlines.(UA 1101)
Sun 07:52 Denver (DEN) 13:14 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Airbus A321neo (32Q) 3:22 Operates only on 2026-03-08
Codeshare flight, operated by United Airlines.(UA 1101)
Tue,Fri-Sun 08:10 Denver (DEN) 13:27 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Airbus A321neo (32Q) 3:17 Effective 2026-05-01 through 2026-05-19
Codeshare flight, operated by United Airlines.(UA 1101)
Tue,Fri-Sun 08:10 Denver (DEN) 13:27 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Boeing 737-900 (739) 3:17 Effective 2026-05-22 through 2026-05-31
Codeshare flight, operated by United Airlines.(UA 1101)
Daily 08:10 Denver (DEN) 13:27 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Boeing 737-900 (739) 3:17 Effective 2026-06-01 through 2026-09-29
Codeshare flight, operated by United Airlines.(UA 1101)
Tue,Fri-Sun 08:10 Denver (DEN) 13:27 Washington Dulles (IAD)
ITA Airways AZ 4389 Non-stop Boeing 737-900 (739) 3:17 Effective 2026-10-02 through 2026-10-24
Codeshare flight, operated by United Airlines.(UA 1101)




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ITA Airways flights from Denver (DEN) to Washington Dulles (IAD).
Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
ITA Airways AZ4374
10:20
Denver (DEN)

15:44
Washington Dulles (IAD)
Effective 2026-03-08 through 2026-03-26
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 326)
Duration: 3:24, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4375
06:00
Denver (DEN)

11:20
Washington Dulles (IAD)
Operates only on 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 1279)
Duration: 3:20, non-stop
Boeing 737 MAX 9 (7M9)
Direct Codeshare Flights:
ITA Airways AZ4375
06:00
Denver (DEN)

11:29
Washington Dulles (IAD)
Effective 2026-03-29 through 2026-04-28
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1279)
Duration: 3:29, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4375
06:00
Denver (DEN)

11:14
Washington Dulles (IAD)
Effective 2026-05-01 through 2026-05-31
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1279)
Duration: 3:14, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4375
06:00
Denver (DEN)

11:14
Washington Dulles (IAD)
Effective 2026-06-01 through 2026-09-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1279)
Duration: 3:14, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4375
06:00
Denver (DEN)

11:14
Washington Dulles (IAD)
Effective 2026-10-02 through 2026-10-24
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1279)
Duration: 3:14, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4375
06:10
Denver (DEN)

11:30
Washington Dulles (IAD)
Operates only on 2026-03-05
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 1279)
Duration: 3:20, non-stop
Boeing 757-200 (752)
Direct Codeshare Flights:
ITA Airways AZ4389
07:45
Denver (DEN)

13:05
Washington Dulles (IAD)
Effective 2026-03-01 through 2026-03-05
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 351)
Duration: 3:20, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4389
07:45
Denver (DEN)

13:05
Washington Dulles (IAD)
Effective 2026-03-10 through 2026-03-26
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 351)
Duration: 3:20, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4389
07:45
Denver (DEN)

13:07
Washington Dulles (IAD)
Effective 2026-03-15 through 2026-03-22
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:22, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
ITA Airways AZ4389
07:45
Denver (DEN)

13:14
Washington Dulles (IAD)
Effective 2026-03-29 through 2026-04-28
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:29, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4389
07:52
Denver (DEN)

13:14
Washington Dulles (IAD)
Operates only on 2026-03-08
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:22, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
ITA Airways AZ4389
08:10
Denver (DEN)

13:27
Washington Dulles (IAD)
Effective 2026-05-01 through 2026-05-19
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:17, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
ITA Airways AZ4389
08:10
Denver (DEN)

13:27
Washington Dulles (IAD)
Effective 2026-05-22 through 2026-05-31
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:17, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4389
08:10
Denver (DEN)

13:27
Washington Dulles (IAD)
Effective 2026-06-01 through 2026-09-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:17, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
ITA Airways AZ4389
08:10
Denver (DEN)

13:27
Washington Dulles (IAD)
Effective 2026-10-02 through 2026-10-24
Mon
-
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1101)
Duration: 3:17, non-stop
Boeing 737-900 (739)
  • 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 3:14 and 3:29.
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