Airlines with flights from Ontario to Denver

There are five airlines with scheduled flights between ONT and DEN. Southwest, United and Frontier has non-stop flights from Ontario International Airport to Denver International and the flight time is 2 hours and 15 minutes.

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Schedules

Southwest Airlines

Non-stop with Southwest Airlines

  • Total flight time: 2 hours and 15 minutes
  • Low-cost airline
  • Denver is a Southwest Airlines focus city (Operating base).
  • 33 flights per week
  • Boeing 737MAX 8 Passenger
    Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737-700 Passenger (Scimitar Winglets)
ONT
Direct
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
WN3144
05:50
05:45
05:45
05:50
05:50
06:00
05:55
WN3145
08:00
08:15
08:15
08:00
08:00
08:05
08:50
WN3062
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11:55
WN3146
12:50
13:20
13:20
12:50
12:50
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WN3147
14:30
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----
14:30
14:30
14:20
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WN2687
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14:50
14:50
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WN670
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----
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15:10
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

United Airlines

Non-stop with United Airlines

  • Total flight time: 2 hours and 20 minutes
  • Denver is a United Airlines hub.
  • 18 flights per week
  • Boeing 737MAX 9 Passenger
    Airbus A320
  • Business and first class available
ONT
Direct
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
UA2446
05:00
05:00
05:00
05:00
05:00
05:00
05:00
UA1263
13:18
13:18
13:18
13:18
13:18
13:18
13:18
UA1316
18:30
----
18:30
18:30
18:30
----
18:30
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

Frontier Airlines

Non-stop with Frontier Airlines

  • Total flight time: 2 hours and 22 minutes
  • Low-cost airline
  • Denver is a Frontier Airlines focus city (Operating base).
  • 14 flights per week
  • Airbus A320neo
    Airbus A320
ONT
Direct
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
F91500
06:00
06:00
06:00
06:00
06:00
06:00
06:00
F92908
10:50
10:50
10:50
10:50
10:50
10:50
10:50
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

American Airlines

Via Phoenix with American Airlines

  • Total flight time: 3h 30m - 5h 43m.
  • One World Alliance
  • 97 flights per week
ONT
 
Via PHX
 
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
AA1194
AA1757
06:10
06:10
06:10
06:10
06:10
06:10
06:10
AA2244
AA1638
13:10
13:10
13:10
13:10
13:10
13:10
13:10
AA864
AA3255
19:12
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19:12
19:12
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19:12
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

Southwest Airlines

Via Las Vegas with Southwest Airlines

  • Total flight time: 3h 35m - 8h 40m.
  • Low-cost airline
  • Denver is a Southwest Airlines focus city (Operating base).
  • 138 flights per week
  • Boeing 737MAX 8 Passenger
    Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737-700 Passenger (Scimitar Winglets)
ONT
 
Via LAS
 
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
WN3150
WN519
05:30
05:30
05:30
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05:30
WN3150
WN1768
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05:30
05:30
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----
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WN3150
WN1587
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----
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----
05:40
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WN3580
WN1423
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08:30
08:30
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----
----
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WN2333
WN2226
08:35
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----
08:35
08:35
10:00
09:45
WN3151
WN1382
12:40
----
----
12:40
12:40
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----
WN300
WN2969
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----
----
----
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14:35
WN2126
WN3843
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----
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----
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15:00
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WN873
WN4225
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15:40
15:40
----
----
----
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WN2213
WN3843
16:40
18:35
18:35
16:40
16:40
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WN5082
WN3843
----
----
----
----
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19:00
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

Southwest Airlines

Via Phoenix with Southwest Airlines

  • Total flight time: 3h 40m - 7h 30m.
  • Low-cost airline
  • Denver is a Southwest Airlines focus city (Operating base).
  • 143 flights per week
  • Boeing 737MAX 8 Passenger
    Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737-700 Passenger (Scimitar Winglets)
ONT
 
Via PHX
 
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
WN864
WN3261
05:15
05:15
05:15
----
05:15
WN864
WN240
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05:15
05:15
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WN4460
WN28
----
----
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----
----
05:30
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WN4421
WN3262
08:00
----
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08:00
08:00
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WN2789
WN2492
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09:50
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WN3805
WN2492
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10:10
10:10
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----
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WN3062
WN3265
12:45
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12:45
12:45
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WN3585
WN2886
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----
----
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12:45
WN1450
WN2073
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13:30
13:30
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----
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WN3159
WN3267
17:15
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17:15
17:15
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WN3160
WN3233
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19:20
19:20
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----
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WN3160
WN482
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20:40
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

Delta Air Lines

Via Salt Lake City with Delta Air Lines

  • Total flight time: 4h 08m - 6h 17m.
  • Sky Team Alliance
  • 59 flights per week
ONT
 
Via SLC
 
DEN
 
Flight
Mon
Jun 15
Tue
Jun 16
Wed
Jun 17
Thu
Jun 18
Fri
Jun 19
Sat
Jun 20
Sun
Jun 21
DL2708
DL1553
06:00
06:00
06:00
06:00
06:00
06:00
06:00
DL1302
DL1623
09:40
09:40
09:40
09:40
09:40
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09:40
DL3172
DL1586
13:00
13:00
13:00
13:00
13:00
13:00
13:00
DL4443
DL1667
17:24
17:24
17:24
17:24
17:24
17:24
17:24
SHOW RETURN SCHEDULE
CHECK PRICES FOR ONT - DEN

The timetable & schedule information was updated at 2026-04-21

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Flight data on this page was last updated on 2026-06-02
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