Cheap Flights from Ontario, CA to Denver, CO from $29
On Cheapflightsplus.com you will find 9 direct and 123 connecting flights from Ontario to Denver. You can compare airfare deals from 4 airlines and multiple travel sites from $29, book and save on cheap plane tickets and last minute offers. Also check out ONT-DEN flight schedule to find best flight time, convenient departure and arrival airports.
Find One-Way and Round-Trip Ontario to Denver Flight Deals
Best Flights from Ontario to Denver Today
Price | Departure | Arrival | Flight Duration | Airline | Flight |
---|---|---|---|---|---|
from $29 | 00:59 Ontario Ontario Int. | 04:17 Denver Denver International | 2h 18m | Frontier Airlines | F91500 |
from $62 | 17:21 Ontario Ontario Int. | 20:42 Denver Denver International | 2h 21m | Frontier Airlines | F92908 |
from $83 | 13:15 Ontario Ontario Int. | 16:31 Denver Denver International | 2h 16m | United Airlines | UA1417 |
from $83 | 05:10 Ontario Ontario Int. | 08:27 Denver Denver International | 2h 17m | United Airlines | UA2446 |
from $83 | 18:38 Ontario Ontario Int. | 21:55 Denver Denver International | 2h 17m | United Airlines | UA368 |
from $84 | 05:10 Ontario Ontario Int. | 08:27 Denver Denver International | 2h 17m | United Airlines | UA1479 |
from $84 | 13:15 Ontario Ontario Int. | 16:32 Denver Denver International | 2h 17m | United Airlines | UA1697 |
from $89 | 05:05 Ontario Ontario Int. | 08:23 Denver Denver International | 2h 18m | United Airlines | UA1575 |
from $108 | 18:28 Ontario Ontario Int. | 21:47 Denver Denver International | 2h 19m | United Airlines | UA635 |
from $54 | 17:15 Ontario Ontario Int. | 22:45 Denver Denver International | 4h 30m layover 1h 12m - Las Vegas | Frontier Airlines | F91358 F94612 |
from $72 | 08:00 Ontario Ontario Int. | 03:59+1 день Denver Denver International | 18h 59m layover 15h 47m - Las Vegas | Frontier Airlines | F92232 F91994 |
from $87 | 21:41 Ontario Ontario Int. | 18:43+1 день Denver Denver International | 20h 2m layover 15h 47m - San Francisco | Frontier Airlines | F92677 F91094 |
from $89 | 13:31 Ontario Ontario Int. | 21:46 Denver Denver International | 7h 15m layover 1h 45m - Seattle | Hawaiian Airlines | HA6289 HA6654 |
from $90 | 16:00 Ontario Ontario Int. | 23:59 Denver Denver International | 6h 59m layover 1h 37m - Seattle | Hawaiian Airlines | HA6290 HA6652 |
from $90 | 14:21 Ontario Ontario Int. | 23:59 Denver Denver International | 8h 38m layover 3h 19m - Seattle | Hawaiian Airlines | HA6307 HA6652 |
from $95 | 15:54 Ontario Ontario Int. | 07:36+1 день Denver Denver International | 14h 42m layover 8h 42m - Houston | Frontier Airlines | F93132 F93229 |
Flight Schedule Ontario (California) to Denver (Colorado)
Departure | Arrival | Flight Details | Flight Duration | Price |
---|---|---|---|---|
00:59 — 04:17
|
00:59 — 04:17
F91500
Frontier Airlines
Ontario — Denver
|
2h 18m |
Find flight
from$29 |
|
05:05 — 08:23
|
05:05 — 08:23
UA1575
United Airlines
Ontario — Denver
|
2h 18m |
Find flight
from$89 |
|
05:10 — 08:27
|
05:10 — 08:27
UA2446
United Airlines
Ontario — Denver
|
2h 17m |
Find flight
from$83 |
|
05:10 — 08:27
|
05:10 — 08:27
UA1479
United Airlines
Ontario — Denver
|
2h 17m |
Find flight
from$84 |
|
13:15 — 16:31
|
13:15 — 16:31
UA1417
United Airlines
Ontario — Denver
|
2h 16m |
Find flight
from$83 |
|
13:15 — 16:32
|
13:15 — 16:32
UA1697
United Airlines
Ontario — Denver
|
2h 17m |
Find flight
from$84 |
|
17:21 — 20:42
|
17:21 — 20:42
F92908
Frontier Airlines
Ontario — Denver
|
2h 21m |
Find flight
from$62 |
|
18:28 — 21:47
|
18:28 — 21:47
UA635
United Airlines
Ontario — Denver
|
2h 19m |
Find flight
from$108 |
|
18:38 — 21:55
|
18:38 — 21:55
UA368
United Airlines
Ontario — Denver
|
2h 17m |
Find flight
from$83 |
|
06:00 — 14:06
|
06:00 — 08:42
AS1091
Alaska Airlines
Ontario — Seattle
1h 31m stop
10:20 — 14:07
AS535
Alaska Airlines
Seattle — Denver
|
7h 6m including layover |
Find flight
from$96 |
|
06:00 — 21:46
|
06:00 — 08:45
HA6288
Hawaiian Airlines
Ontario — Seattle
9h 14m stop
18:00 — 21:47
HA6654
Hawaiian Airlines
Seattle — Denver
|
14h 46m including layover |
Find flight
from$128 |
|
08:00 — 03:59
+1 day
|
06:00 — 07:16
F92232
Frontier Airlines
Ontario — Las Vegas
15h 47m stop
00:59 — 04:00
F91994
Frontier Airlines
Las Vegas — Denver
|
18h 59m including layover |
Find flight
from$72 |
|
08:00 — 20:00
|
15:56 — 17:09
F92232
Frontier Airlines
Ontario — Las Vegas
7h 39m stop
06:25 — 09:29
F93540
Frontier Airlines
Las Vegas — Denver
|
11h including layover |
Find flight
from$74 |
|
09:35 — 18:14
|
09:35 — 10:54
UA1585
United Airlines
Ontario — San Francisco
3h 40m stop
14:34 — 18:14
UA1596
United Airlines
San Francisco — Denver
|
7h 39m including layover |
Find flight
from$148 |
|
09:36 — 16:35
|
09:35 — 10:54
UA1585
United Airlines
Ontario — San Francisco
2h stop
12:55 — 16:36
UA1333
United Airlines
San Francisco — Denver
|
5h 59m including layover |
Find flight
from$138 |
|
11:15 — 18:02
|
10:00 — 12:22
HA6284
Hawaiian Airlines
Ontario — Portland
59m stop
14:30 — 18:09
HA6338
Hawaiian Airlines
Portland — Denver
|
5h 47m including layover |
Find flight
from$162 |
|
11:15 — 18:02
|
10:03 — 12:19
AS2456
Alaska Airlines
Ontario — Portland
59m stop
14:34 — 18:10
AS1235
Alaska Airlines
Portland — Denver
|
5h 47m including layover |
Find flight
from$168 |
|
12:00 — 19:32
|
12:00 — 14:38
HA6289
Hawaiian Airlines
Ontario — Seattle
1h 11m stop
15:49 — 19:32
HA6650
Hawaiian Airlines
Seattle — Denver
|
6h 32m including layover |
Find flight
from$163 |
|
13:37 — 20:00
|
17:15 — 18:28
F91358
Frontier Airlines
Ontario — Las Vegas
1h 56m stop
15:46 — 18:57
F93540
Frontier Airlines
Las Vegas — Denver
|
5h 23m including layover |
Find flight
from$69 |
|
14:21 — 23:59
|
14:21 — 16:58
HA6307
Hawaiian Airlines
Ontario — Seattle
3h 19m stop
20:17 — 23:59
HA6652
Hawaiian Airlines
Seattle — Denver
|
8h 38m including layover |
Find flight
from$90 |
|
14:21 — 23:59
|
14:21 — 16:58
AS1242
Alaska Airlines
Ontario — Seattle
3h 19m stop
20:17 — 23:59
AS642
Alaska Airlines
Seattle — Denver
|
8h 38m including layover |
Find flight
from$97 |
|
15:54 — 07:36
+1 day
|
12:40 — 18:11
F93132
Frontier Airlines
Ontario — Houston
8h 42m stop
06:00 — 07:50
F93229
Frontier Airlines
Houston — Denver
|
14h 42m including layover |
Find flight
from$95 |
|
16:00 — 23:59
|
16:00 — 18:40
HA6290
Hawaiian Airlines
Ontario — Seattle
1h 37m stop
20:17 — 23:59
HA6652
Hawaiian Airlines
Seattle — Denver
|
6h 59m including layover |
Find flight
from$90 |
|
16:00 — 23:59
|
16:00 — 18:40
AS1119
Alaska Airlines
Ontario — Seattle
1h 37m stop
20:17 — 23:59
AS642
Alaska Airlines
Seattle — Denver
|
6h 59m including layover |
Find flight
from$97 |
|
17:15 — 22:45
|
13:17 — 14:29
F91358
Frontier Airlines
Ontario — Las Vegas
1h 12m stop
20:33 — 23:36
F94612
Frontier Airlines
Las Vegas — Denver
|
4h 30m including layover |
Find flight
from$54 |
|
17:26 — 04:00
+1 day
|
09:26 — 10:33
F91358
Frontier Airlines
Ontario — Las Vegas
6h 20m stop
06:30 — 09:38
F91994
Frontier Airlines
Las Vegas — Denver
|
9h 34m including layover |
Find flight
from$54 |
|
19:25 — 11:55
+1 day
|
19:25 — 22:05
HA6287
Hawaiian Airlines
Ontario — Seattle
9h 57m stop
08:02 — 11:55
HA6555
Hawaiian Airlines
Seattle — Denver
|
15h 30m including layover |
Find flight
from$128 |
|
19:25 — 11:55
+1 day
|
19:25 — 22:05
AS1399
Alaska Airlines
Ontario — Seattle
9h 57m stop
08:02 — 11:55
AS682
Alaska Airlines
Seattle — Denver
|
15h 30m including layover |
Find flight
from$135 |
|
21:41 — 18:43
+1 day
|
21:41 — 23:13
F92677
Frontier Airlines
Ontario — San Francisco
15h 47m stop
15:00 — 18:43
F91094
Frontier Airlines
San Francisco — Denver
|
20h 2m including layover |
Find flight
from$87 |
|
21:41 — 09:44
+1 day
|
06:00 — 07:35
F92677
Frontier Airlines
Ontario — San Francisco
6h 47m stop
06:55 — 10:30
F91230
Frontier Airlines
San Francisco — Denver
|
11h 3m including layover |
Find flight
from$96 |
|
07:10 — 21:59
|
07:10 — 09:27
AS1058
Alaska Airlines
Ontario — Portland
3h 57m stop
13:24 — 14:26
AS1016
Alaska Airlines
Portland — Seattle
3h 46m stop
18:12 — 21:59
AS1163
Alaska Airlines
Seattle — Denver
|
13h 49m including layover |
Find flight
from$135 |
|
07:10 — 21:59
|
07:10 — 09:27
AS1058
Alaska Airlines
Ontario — Portland
5h 3m stop
14:30 — 15:33
AS3380
Alaska Airlines
Portland — Seattle
2h 39m stop
18:12 — 21:59
AS1163
Alaska Airlines
Seattle — Denver
|
13h 49m including layover |
Find flight
from$139 |
|
10:03 — 23:59
|
10:03 — 12:19
AS2456
Alaska Airlines
Ontario — Portland
3h 21m stop
15:40 — 16:40
AS3446
Alaska Airlines
Portland — Seattle
3h 37m stop
20:17 — 23:59
AS642
Alaska Airlines
Seattle — Denver
|
12h 56m including layover |
Find flight
from$136 |
|
10:03 — 23:59
|
10:03 — 12:19
AS2456
Alaska Airlines
Ontario — Portland
1h 1m stop
13:20 — 14:20
AS1016
Alaska Airlines
Portland — Seattle
5h 57m stop
20:17 — 23:59
AS642
Alaska Airlines
Seattle — Denver
|
12h 56m including layover |
Find flight
from$141 |
Flight Information
Below we will explain in detail what the flights cost on the destination from Ontario to Denver depends on and how to choose the most interesting flight option for you.
Distance between Ontario and Denver is 1316 miles. Time difference between the cities is 1h. Airplanes depart 00:59 to 21:41 from 2 Ontario airports and arrive 00:59 to 21:41 to 2 Denver airports. Average flight time is 2h 17m.
- The fastest flight 2h 16m
- Average flight time 2h 17m
- The earliest flight 00:59
- The latest flight 21:41
- Distance 818 ml
The cheapest months to travel to Denver are november (from 39 $), july (from 39 $), january (from 52 $).
The most expensive months are october (from 100 $), august (from 96 $), september (from 93 $).
What is the lowest airfare Ontario to Denver?
The cheapest plane ticket found by our users is $29. This airfare is for economy class on one-way F91500 flight by Frontier Airlines for July 8, 2025 which leaves Ontario Int. in Ontario at 00:59 am and arrives at Denver Denver International at 04:17.
Popular Airlines on the Route
The flight Ontario — Denver is served by 4 regular airlines and 1 low-cost airline. Most of the flights on this route are operated by Alaska Airlines - 47 departures per week at the price of from $ 96 . And the most expensive tickets are offered by Hawaiian Airlines airline - from $ 465.
Direct flights
There are 9 nonstop flights on the route. The fastest direct flight is UA1417 by United Airlines takes 2h 16m and the cheapest is F91500 by Frontier Airlines for $29.
- F9 - Frontier Airlinesfrom $29Find
- UA - United Airlinesfrom $83Find
Connecting Flights
There are 123 flights with layovers on the route. The fastest connecting flight is F91358 by Frontier Airlines takes 4h 30m and the cheapest is F91500 by Frontier Airlines for $54.
- AS - Alaska Airlinesfrom $96Find
- F9 - Frontier Airlinesfrom $54Find
- HA - Hawaiian Airlinesfrom $89Find
- UA - United Airlinesfrom $138Find
Airports
You can fly from Ontario to Denver from 2 airports (Ontario Int., International Heliport).
Ontario airports
- Ontario Int.-ONTfrom $29Find
- International Heliport-JIOFind
Denver airports
- Denver International-DENFind
- Arapahoe Co-APAFind
Airplanes
There are flights to Denver from Ontario by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.
Top Domestic Destinations from Ontario
You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.
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Top International Destinations from Ontario
Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.
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How to book a plane ticket yourself?

- Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
- Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
- Click «Buy» when you are ready — our system will redirect you to the site that sells the selected flight ticket.
- Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
- That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.
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