Airlines with flights from Ontario to Denver

There are five airlines with scheduled flights between ONT and DEN. Southwest, Frontier and United 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).
  • 27 flights per week
  • Boeing 737-800 (winglets) Passenger/BBJ2
    Boeing 737MAX 8 Passenger
    Boeing 737-700 Passenger (Scimitar Winglets)
ONT
Direct
DEN
 
Flight
Mon
Aug 3
Tue
Aug 4
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Aug 5
Thu
Aug 6
Fri
Aug 7
Sat
Aug 8
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Aug 9
WN3144
05:50
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WN319
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06:20
06:20
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WN3539
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06:25
WN3074
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07:00
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06:55
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WN4604
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07:00
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WN3145
08:00
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WN3075
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08:10
08:10
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WN2239
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09:25
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WN1428
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10:40
WN1082
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10:55
10:55
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WN3076
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12:25
12:25
13:00
14:05
WN3146
12:50
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WN196
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13:50
13:50
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WN239
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14:00
14:00
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WN3147
14:30
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WN1228
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17:55
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 23 minutes
  • Low-cost airline
  • Denver is a Frontier Airlines focus city (Operating base).
  • 14 flights per week
  • Airbus A320neo
ONT
Direct
DEN
 
Flight
Mon
Aug 3
Tue
Aug 4
Wed
Aug 5
Thu
Aug 6
Fri
Aug 7
Sat
Aug 8
Sun
Aug 9
F91500
06:00
06:00
06:00
06:00
06:00
06:00
06:00
F92908
10:49
10:49
10:49
10:49
10:49
10:49
10:49
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.
  • 14 flights per week
  • Boeing 737MAX 8 Passenger
    Boeing 737-800 Passenger
    Boeing 737MAX 9 Passenger
  • Business and first class available
ONT
Direct
DEN
 
Flight
Mon
Aug 3
Tue
Aug 4
Wed
Aug 5
Thu
Aug 6
Fri
Aug 7
Sat
Aug 8
Sun
Aug 9
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
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
Aug 3
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Aug 4
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Aug 5
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Aug 6
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Aug 7
Sat
Aug 8
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Aug 9
AA1194
AA1757
06:10
06:10
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AA1194
AA1332
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06:15
06:15
06:15
06:15
06:15
AA2661
AA2602
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12:59
12:59
12:59
12:59
12:59
AA2244
AA1638
13:10
13:10
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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 737-800 (winglets) Passenger/BBJ2
    Boeing 737MAX 8 Passenger
    Boeing 737-700 Passenger (Scimitar Winglets)
ONT
 
Via LAS
 
DEN
 
Flight
Mon
Aug 3
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Aug 4
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Aug 5
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Aug 6
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Aug 7
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Aug 8
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Aug 9
WN3150
WN519
05:30
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WN3080
WN3675
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05:40
05:40
05:40
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WN3080
WN163
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05:45
05:45
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WN2495
WN2158
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06:40
WN2235
WN2157
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08:30
08:30
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WN2333
WN2226
08:35
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WN2200
WN4139
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09:10
WN4314
WN2157
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09:40
09:40
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WN454
WN2157
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11:00
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WN3151
WN1382
12:40
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WN554
WN715
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14:10
14:10
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WN4469
WN2160
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14:55
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WN3081
WN2160
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16:35
WN2213
WN3843
16:40
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WN1037
WN2162
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16:45
16:45
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WN4315
WN374
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17:45
17:45
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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 737-800 (winglets) Passenger/BBJ2
    Boeing 737MAX 8 Passenger
    Boeing 737-700 Passenger (Scimitar Winglets)
ONT
 
Via PHX
 
DEN
 
Flight
Mon
Aug 3
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Aug 4
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Aug 5
Thu
Aug 6
Fri
Aug 7
Sat
Aug 8
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Aug 9
WN901
WN3190
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05:15
05:15
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WN864
WN3261
05:15
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WN503
WN2998
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05:35
WN503
WN1349
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05:50
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WN503
WN3194
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06:50
06:50
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WN4421
WN3262
08:00
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WN1774
WN3192
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08:00
08:00
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WN3087
WN472
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08:35
08:35
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WN894
WN3300
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10:05
WN3087
WN4346
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10:15
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WN3062
WN3265
12:45
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WN3876
WN3192
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13:10
13:10
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WN2638
WN2442
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14:30
WN3089
WN4346
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14:40
14:40
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WN3876
WN4661
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15:15
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WN3089
WN4661
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15:35
15:35
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WN2119
WN4347
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16:50
16:50
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WN3159
WN3267
17:15
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WN3089
WN4347
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18:10
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
Aug 3
Tue
Aug 4
Wed
Aug 5
Thu
Aug 6
Fri
Aug 7
Sat
Aug 8
Sun
Aug 9
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
17:16
17:16
17:16
17:16
17:16
17:16
17:16
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 2026-07-21
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