Cheap Flights from Denver, CO to Ontario, CA from $45
On Cheapflightsplus.com you will find 3 direct and 20 connecting flights from Denver to Ontario. You can compare airfare deals from 4 airlines and multiple travel sites from $45, book and save on cheap plane tickets and last minute offers. Also check out DEN-ONT flight schedule to find best flight time, convenient departure and arrival airports.
Find One-Way and Round-Trip Denver to Ontario Flight Deals
Best Flights from Denver to Ontario Today
Price | Departure | Arrival | Flight Duration | Airline | Flight |
---|---|---|---|---|---|
from $45 | 22:20 Denver Denver International | 23:39 Ontario Ontario Int. | 2h 19m | Frontier Airlines | F91499 |
from $45 | 18:15 Denver Denver International | 19:37 Ontario Ontario Int. | 2h 22m | Frontier Airlines | F92907 |
from $138 | 19:28 Denver Denver International | 20:55 Ontario Ontario Int. | 2h 27m | United Airlines | UA351 |
from $86 | 22:16 Denver Denver International | 06:36+1 день Ontario Ontario Int. | 9h 20m layover 5h 17m - San Francisco | Frontier Airlines | F93439 F92678 |
from $97 | 10:00 Denver Denver International | 17:06 Ontario Ontario Int. | 8h 6m layover 4h 45m - Salt Lake City | Frontier Airlines | F93981 F93343 |
from $97 | 05:01 Denver Denver International | 17:06 Ontario Ontario Int. | 13h 5m layover 9h 43m - Salt Lake City | Frontier Airlines | F93861 F93343 |
from $179 | 14:49 Denver Denver International | 11:05+1 день Ontario Ontario Int. | 21h 16m layover 16h 5m - Portland | Alaska Airlines | AS350 AS3312 |
from $225 | 08:54 Denver Denver International | 15:58 Ontario Ontario Int. | 8h 4m layover 4h 55m - Phoenix | Frontier Airlines | F91819 F91625 |
from $241 | 09:00 Denver Denver International | 13:01 Ontario Ontario Int. | 5h 1m layover 1h 53m - Las Vegas | Frontier Airlines | F92015 F91357 |
from $244 | 12:38 Denver Denver International | 23:24 Ontario Ontario Int. | 11h 46m layover 6h 4m - Seattle | Alaska Airlines | AS682 AS1003 |
from $255 | 19:55 Denver Denver International | 11:02+1 день Ontario Ontario Int. | 16h 7m layover 10h 27m - Seattle | Alaska Airlines | AS525 AS1254 |
from $258 | 15:50 Denver Denver International | 20:40 Ontario Ontario Int. | 5h 50m layover 1h 25m - San Francisco | United Airlines | UA1300 UA794 |
from $206 | 07:00 Denver Denver International | 23:58 Ontario Ontario Int. | 17h 58m layover 10h 39m - Seattle 0h 54m - Portland | Alaska Airlines | AS643 AS958 AS1066 |
from $243 | 07:00 Denver Denver International | 16:59 Ontario Ontario Int. | 10h 59m layover 0h 44m - Seattle 3h 51m - Portland | Alaska Airlines | AS643 AS2213 AS2074 |
from $243 | 07:00 Denver Denver International | 16:59 Ontario Ontario Int. | 10h 59m layover 2h 20m - Seattle 2h 12m - Portland | Alaska Airlines | AS643 AS1039 AS2074 |
from $249 | 12:38 Denver Denver International | 23:58 Ontario Ontario Int. | 12h 20m layover 5h 10m - Seattle 0h 54m - Portland | Alaska Airlines | AS682 AS958 AS1066 |
Flight Schedule Denver (Colorado) to Ontario (California)
Departure | Arrival | Flight Details | Flight Duration | Price |
---|---|---|---|---|
18:15 — 19:37
|
18:15 — 19:37
F92907
Frontier Airlines
Denver — Ontario
|
2h 22m |
Find flight
from$45 |
|
19:28 — 20:55
|
19:28 — 20:55
UA351
United Airlines
Denver — Ontario
|
2h 27m |
Find flight
from$138 |
|
22:20 — 23:39
|
22:20 — 23:39
F91499
Frontier Airlines
Denver — Ontario
|
2h 19m |
Find flight
from$45 |
|
05:01 — 17:06
|
05:01 — 06:36
F93861
Frontier Airlines
Denver — Salt Lake City
9h 43m stop
16:19 — 17:06
F93343
Frontier Airlines
Salt Lake City — Ontario
|
13h 5m including layover |
Find flight
from$97 |
|
08:54 — 15:58
|
08:54 — 10:50
F91819
Frontier Airlines
Denver — Phoenix
4h 55m stop
15:45 — 15:58
F91625
Frontier Airlines
Phoenix — Ontario
|
8h 4m including layover |
Find flight
from$225 |
|
09:00 — 13:01
|
06:00 — 07:09
F92015
Frontier Airlines
Denver — Las Vegas
1h 53m stop
16:44 — 17:51
F91357
Frontier Airlines
Las Vegas — Ontario
|
5h 1m including layover |
Find flight
from$241 |
|
10:00 — 17:06
|
08:08 — 09:50
F93981
Frontier Airlines
Denver — Salt Lake City
4h 45m stop
17:15 — 18:06
F93343
Frontier Airlines
Salt Lake City — Ontario
|
8h 6m including layover |
Find flight
from$97 |
|
11:20 — 18:05
|
11:20 — 13:17
UA1561
United Airlines
Denver — San Francisco
3h 20m stop
16:37 — 18:05
UA1932
United Airlines
San Francisco — Ontario
|
7h 45m including layover |
Find flight
from$258 |
|
12:15 — 23:01
|
12:15 — 16:43
Y41761
Volaris
Denver — Guadalajara
4h 57m stop
21:40 — 23:01
Y41860
Volaris
Guadalajara — Ontario
|
11h 46m including layover |
Find flight
from$422 |
|
12:38 — 23:24
|
12:04 — 14:17
AS682
Alaska Airlines
Denver — Seattle
6h 4m stop
20:38 — 23:12
AS1003
Alaska Airlines
Seattle — Ontario
|
11h 46m including layover |
Find flight
from$244 |
|
12:38 — 18:19
|
12:04 — 14:17
AS682
Alaska Airlines
Denver — Seattle
1h 4m stop
15:40 — 18:13
AS1086
Alaska Airlines
Seattle — Ontario
|
6h 41m including layover |
Find flight
from$259 |
|
13:30 — 20:40
|
13:30 — 15:26
UA1812
United Airlines
Denver — San Francisco
3h 44m stop
19:10 — 20:40
UA794
United Airlines
San Francisco — Ontario
|
8h 10m including layover |
Find flight
from$258 |
|
13:30 — 18:05
|
13:30 — 15:26
UA1812
United Airlines
Denver — San Francisco
1h 11m stop
16:37 — 18:05
UA1932
United Airlines
San Francisco — Ontario
|
5h 35m including layover |
Find flight
from$299 |
|
14:00 — 17:36
|
13:20 — 14:33
F92349
Frontier Airlines
Denver — Las Vegas
1h 18m stop
13:51 — 15:02
F92231
Frontier Airlines
Las Vegas — Ontario
|
4h 36m including layover |
Find flight
from$443 |
|
14:49 — 11:05
+1 day
|
14:07 — 15:52
AS350
Alaska Airlines
Denver — Portland
16h 5m stop
08:13 — 10:34
AS3312
Alaska Airlines
Portland — Ontario
|
21h 16m including layover |
Find flight
from$179 |
|
15:50 — 20:40
|
15:50 — 17:45
UA1300
United Airlines
Denver — San Francisco
1h 25m stop
19:10 — 20:40
UA794
United Airlines
San Francisco — Ontario
|
5h 50m including layover |
Find flight
from$258 |
|
19:55 — 11:02
+1 day
|
19:55 — 21:58
AS525
Alaska Airlines
Denver — Seattle
10h 27m stop
08:25 — 11:02
AS1254
Alaska Airlines
Seattle — Ontario
|
16h 7m including layover |
Find flight
from$255 |
|
22:16 — 06:36
+1 day
|
22:26 — 00:15
F93439
Frontier Airlines
Denver — San Francisco
5h 17m stop
08:05 — 09:30
F92678
Frontier Airlines
San Francisco — Ontario
|
9h 20m including layover |
Find flight
from$86 |
|
07:00 — 23:58
|
07:00 — 09:16
AS643
Alaska Airlines
Denver — Seattle
10h 39m stop
19:55 — 20:50
AS958
Alaska Airlines
Seattle — Portland
54m stop
21:44 — 23:58
AS1066
Alaska Airlines
Portland — Ontario
|
17h 58m including layover |
Find flight
from$206 |
|
07:00 — 16:59
|
07:00 — 09:16
AS643
Alaska Airlines
Denver — Seattle
44m stop
10:00 — 10:54
AS2213
Alaska Airlines
Seattle — Portland
3h 51m stop
14:45 — 16:59
AS2074
Alaska Airlines
Portland — Ontario
|
10h 59m including layover |
Find flight
from$243 |
|
07:00 — 16:59
|
07:00 — 09:16
AS643
Alaska Airlines
Denver — Seattle
2h 20m stop
11:36 — 12:33
AS1039
Alaska Airlines
Seattle — Portland
2h 12m stop
14:45 — 16:59
AS2074
Alaska Airlines
Portland — Ontario
|
10h 59m including layover |
Find flight
from$243 |
|
12:38 — 23:58
|
12:38 — 14:45
AS682
Alaska Airlines
Denver — Seattle
5h 10m stop
19:55 — 20:50
AS958
Alaska Airlines
Seattle — Portland
54m stop
21:44 — 23:58
AS1066
Alaska Airlines
Portland — Ontario
|
12h 20m including layover |
Find flight
from$249 |
|
17:08 — 23:58
|
17:08 — 19:10
AS615
Alaska Airlines
Denver — Seattle
45m stop
19:55 — 20:50
AS958
Alaska Airlines
Seattle — Portland
54m stop
21:44 — 23:58
AS1066
Alaska Airlines
Portland — Ontario
|
7h 50m including layover |
Find flight
from$275 |
Flight Information
Below we will explain in detail what the flights cost on the destination from Denver to Ontario depends on and how to choose the most interesting flight option for you.
Distance between Denver and Ontario is 1316 miles. Time difference between the cities is 1h. Airplanes depart 05:01 to 22:20 from 2 Denver airports and arrive 05:01 to 22:20 to 2 Ontario airports. Average flight time is 2h 22m.
- The fastest flight 2h 19m
- Average flight time 2h 22m
- The earliest flight 05:01
- The latest flight 22:20
- Distance 818 ml
The cheapest months to travel to Ontario are november (from 30 $), february (from 45 $), january (from 60 $).
The most expensive months are december (from 84 $), january (from 60 $), february (from 45 $).
What is the lowest airfare Denver to Ontario?
The cheapest plane ticket found by our users is $45. This airfare is for economy class on one-way F91499 flight by Frontier Airlines for February 21, 2025 which leaves Denver International in Denver at 22:20 am and arrives at Ontario Ontario Int. at 23:39.
Popular Airlines on the Route
The flight Denver — Ontario is served by 4 regular airlines and 2 low-cost airlines. Most of the flights on this route are operated by Alaska Airlines - 9 departures per week at the price of from $ 179 . And the most expensive tickets are offered by Frontier Airlines airline - from $ 443.
Direct flights
There are 3 nonstop flights on the route. The fastest direct flight is F91499 by Frontier Airlines takes 2h 19m and the cheapest is F91499 by Frontier Airlines for $45.
- from $45Find
- from $138Find
Connecting Flights
There are 20 flights with layovers on the route. The fastest connecting flight is F92349 by Frontier Airlines takes 4h 36m and the cheapest is F91499 by Frontier Airlines for $86.
- from $179Find
- from $86Find
- from $258Find
- Y4 - Volarisfrom $422Find
Airports
You can fly from Denver to Ontario from 2 airports (Denver International, Arapahoe Co).
Denver airports
- Denver International-DENfrom $45Find
- Arapahoe Co-APAFind
Ontario airports
- Ontario Int.-ONTFind
- International Heliport-JIOFind
Airplanes
There are flights to Ontario from Denver by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.
Top Domestic Destinations from Denver
You may also consider searching for discounted plane tickets to some other popular places from Denver within United States.
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Top International Destinations from Denver
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»
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