Cheap Flights from Denver, CO to Ontario, CA from $45

Return flight: Ontario – Denver

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

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $45 (one-way), $77 (round-trip).
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Full flight schedule will help you in detecting at what time planes fly from Denver to Ontario. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.
Departure Arrival Flight Details Flight Duration Price
18:15 — 19:37
18:15 — 19:37 F92907 Frontier Airlines
Denver — Ontario
2h 22m
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from$45
19:28 — 20:55
19:28 — 20:55 UA351 United Airlines
Denver — Ontario
2h 27m
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from$138
22:20 — 23:39
22:20 — 23:39 F91499 Frontier Airlines
Denver — Ontario
2h 19m
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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
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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
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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
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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
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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
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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
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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
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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
*Departure and arrival times - local. Updated on February 7, 2025

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.

Economy class
$45
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Business class
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First class
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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.

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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.

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Airports

You can fly from Denver to Ontario from 2 airports (Denver International, Arapahoe Co).

Denver airports

  • Denver International-DEN
    from $45
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  • Arapahoe Co-APA
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Ontario airports

  • Ontario Int.-ONT
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  • International Heliport-JIO
    Find

How to book a plane ticket yourself?

How to book an air 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.

    To find a plane ticket, please select dates.

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