Frontier Airlines flights from Denver (DEN) to Ontario, Los Angeles (ONT).

FLIGHT SCHEDULE
Direct Flights:
Tue 13:34 Denver (DEN) 15:07 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:33 Effective 2026-01-20 through 2026-02-03
Wed 13:34 Denver (DEN) 15:07 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A321neo (32Q) 2:33 Effective 2026-01-21 through 2026-02-04
Tue,Wed 20:00 Denver (DEN) 21:34 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:34 Effective 2026-02-10 through 2026-03-04
Tue 20:45 Denver (DEN) 22:12 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:27 Operates only on 2026-01-06
Tue,Sat 21:20 Denver (DEN) 22:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:39 Effective 2026-01-13 through 2026-01-17
Wed 21:20 Denver (DEN) 22:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A321neo (32Q) 2:39 Operates only on 2026-01-14
Wed,Sat 21:45 Denver (DEN) 23:14 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:29 Effective 2026-01-07 through 2026-01-10
Sat 21:45 Denver (DEN) 23:24 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:39 Effective 2026-01-24 through 2026-02-07
Daily 22:30 Denver (DEN) 00:01 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A320neo (32N) 2:31 Effective 2026-03-06 through 2026-03-31 The flight arrives 1 day after departure.
Daily 22:32 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1261 Non-stop Airbus A321 (321) 2:27 Effective 2026-04-02 through 2026-04-13
Wed 22:32 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1265 Non-stop Airbus A321 (321) 2:27 Operates only on 2026-04-01
Thu,Fri,Sun 22:29 Denver (DEN) 23:56 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A320neo (32N) 2:27 Effective 2026-01-08 through 2026-01-11
Mon 22:29 Denver (DEN) 23:56 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A321neo (32Q) 2:27 Operates only on 2026-01-12
Thu 22:29 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A320 (320) 2:30 Operates only on 2026-01-15
Fri,Sun 22:29 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A320neo (32N) 2:30 Effective 2026-01-16 through 2026-01-18
Mon 22:29 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A321neo (32Q) 2:30 Operates only on 2026-01-19
Thu,Sat,Sun 22:29 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A320neo (32N) 2:30 Effective 2026-02-12 through 2026-03-05
Mon,Fri 22:29 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A321neo (32Q) 2:30 Effective 2026-02-13 through 2026-03-02
Mon,Fri,Sat 22:32 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A321neo (32Q) 2:27 Valid until 2026-01-05
Tue,Thu,Sun 22:32 Denver (DEN) 23:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A320neo (32N) 2:27 Valid until 2026-01-04
Mon,Thu,Fri 22:49 Denver (DEN) 00:20 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A320neo (32N) 2:31 Effective 2026-01-22 through 2026-02-09 The flight arrives 1 day after departure.
Sun 22:49 Denver (DEN) 00:20 Ontario, Los Angeles (ONT) Frontier Airlines F9 1499 Non-stop Airbus A321neo (32Q) 2:31 Effective 2026-01-25 through 2026-02-08 The flight arrives 1 day after departure.
Sun 06:20 Denver (DEN) 07:59 Ontario, Los Angeles (ONT) Frontier Airlines F9 2907 Non-stop Airbus A320neo (32N) 2:39 Effective 2026-02-15 through 2026-03-01
Thu 08:00 Denver (DEN) 09:34 Ontario, Los Angeles (ONT) Frontier Airlines F9 2907 Non-stop Airbus A321neo (32Q) 2:34 Effective 2026-02-12 through 2026-03-05

A domestic route departing from the Denver airport (DEN) and arriving at Ontario, Los Angeles airport (ONT).
The flight distance is 817 miles, or 1315 km.
The timezone of the departure airport is UTC-7 , and the timezone of the arrival airport is UTC-8 . 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 2:27 and 2:39.

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FLIGHT SCHEDULE

Direct Flights:

Frontier Airlines F91261

13:34

Denver (DEN)

15:07

Ontario, Los Angeles (ONT)

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

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:33, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91261

13:34

Denver (DEN)

15:07

Ontario, Los Angeles (ONT)

Effective 2026-01-21 through 2026-02-04

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:33, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F91261

20:00

Denver (DEN)

21:34

Ontario, Los Angeles (ONT)

Effective 2026-02-10 through 2026-03-04

Mon
-

Tue

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:34, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91261

20:45

Denver (DEN)

22:12

Ontario, Los Angeles (ONT)

Operates only on 2026-01-06

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:27, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91261

21:20

Denver (DEN)

22:59

Ontario, Los Angeles (ONT)

Effective 2026-01-13 through 2026-01-17

Mon
-

Tue

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:39, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91261

21:20

Denver (DEN)

22:59

Ontario, Los Angeles (ONT)

Operates only on 2026-01-14

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:39, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F91261

21:45

Denver (DEN)

23:14

Ontario, Los Angeles (ONT)

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

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:29, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91261

21:45

Denver (DEN)

23:24

Ontario, Los Angeles (ONT)

Effective 2026-01-24 through 2026-02-07

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat

Sun
-

Duration: 2:39, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91261

22:30

Denver (DEN)

00:01(+1)

Ontario, Los Angeles (ONT)

Effective 2026-03-06 through 2026-03-31

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:31, non-stop
Airbus A320neo (32N)
The flight arrives 1 day after departure.

Direct Flights:

Frontier Airlines F91261

22:32

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Effective 2026-04-02 through 2026-04-13

Mon

Tue

Wed

Thu

Fri

Sat

Sun

Duration: 2:27, non-stop
Airbus A321 (321)

Direct Flights:

Frontier Airlines F91265

22:32

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Operates only on 2026-04-01

Mon
-

Tue
-

Wed

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:27, non-stop
Airbus A321 (321)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:56

Ontario, Los Angeles (ONT)

Effective 2026-01-08 through 2026-01-11

Mon
-

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun

Duration: 2:27, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:56

Ontario, Los Angeles (ONT)

Operates only on 2026-01-12

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:27, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Operates only on 2026-01-15

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:30, non-stop
Airbus A320 (320)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Effective 2026-01-16 through 2026-01-18

Mon
-

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun

Duration: 2:30, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Operates only on 2026-01-19

Mon

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun
-

Duration: 2:30, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Effective 2026-02-12 through 2026-03-05

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat

Sun

Duration: 2:30, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91499

22:29

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Effective 2026-02-13 through 2026-03-02

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat
-

Sun
-

Duration: 2:30, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F91499

22:32

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Valid until 2026-01-05

Mon

Tue
-

Wed
-

Thu
-

Fri

Sat

Sun
-

Duration: 2:27, non-stop
Airbus A321neo (32Q)

Direct Flights:

Frontier Airlines F91499

22:32

Denver (DEN)

23:59

Ontario, Los Angeles (ONT)

Valid until 2026-01-04

Mon
-

Tue

Wed
-

Thu

Fri
-

Sat
-

Sun

Duration: 2:27, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F91499

22:49

Denver (DEN)

00:20(+1)

Ontario, Los Angeles (ONT)

Effective 2026-01-22 through 2026-02-09

Mon

Tue
-

Wed
-

Thu

Fri

Sat
-

Sun
-

Duration: 2:31, non-stop
Airbus A320neo (32N)
The flight arrives 1 day after departure.

Direct Flights:

Frontier Airlines F91499

22:49

Denver (DEN)

00:20(+1)

Ontario, Los Angeles (ONT)

Effective 2026-01-25 through 2026-02-08

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:31, non-stop
Airbus A321neo (32Q)
The flight arrives 1 day after departure.

Direct Flights:

Frontier Airlines F92907

06:20

Denver (DEN)

07:59

Ontario, Los Angeles (ONT)

Effective 2026-02-15 through 2026-03-01

Mon
-

Tue
-

Wed
-

Thu
-

Fri
-

Sat
-

Sun

Duration: 2:39, non-stop
Airbus A320neo (32N)

Direct Flights:

Frontier Airlines F92907

08:00

Denver (DEN)

09:34

Ontario, Los Angeles (ONT)

Effective 2026-02-12 through 2026-03-05

Mon
-

Tue
-

Wed
-

Thu

Fri
-

Sat
-

Sun
-

Duration: 2:34, non-stop
Airbus A321neo (32Q)

A domestic route departing from the Denver airport (DEN) and arriving at Ontario, Los Angeles airport (ONT).
The flight distance is 817 miles, or 1315 km.
The timezone of the departure airport is UTC-7 , and the timezone of the arrival airport is UTC-8 . 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 2:27 and 2:39.

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