Cheap Flights from Ontario, CA to Denver, CO from $35

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On Cheapflightsplus.com you will find 12 direct and 205 connecting flights from Ontario to Denver. You can compare airfare deals from 4 airlines and multiple travel sites from $35, 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

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: $35 (one-way), $60 (round-trip).

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Best Flights from Ontario to Denver Today

Take a look at the list of non stop flights and flights with layovers from Ontario to Denver with the lowest price of $35. The fastest direct flight takes 2h 18m and the fastest connecting – 3h 54m.

Price	Departure	Arrival	Flight Duration	Airline	Flight
from $35 Find flight	10:39 Ontario Ontario Int.	13:57 Denver Denver International	2h 18m	Frontier Airlines	F91262
from $35 Find flight	00:49 Ontario Ontario Int.	04:10 Denver Denver International	2h 21m	Frontier Airlines	F91500
from $47 Find flight	16:51 Ontario Ontario Int.	20:09 Denver Denver International	2h 18m	Frontier Airlines	F92908
from $113 Find flight	05:05 Ontario Ontario Int.	08:25 Denver Denver International	2h 20m	United Airlines	UA2357
from $155 Find flight	05:05 Ontario Ontario Int.	08:24 Denver Denver International	2h 19m	United Airlines	UA1575
from $236 Find flight	05:05 Ontario Ontario Int.	08:23 Denver Denver International	2h 18m	United Airlines	UA2329
from $62 Find flight	19:59 Ontario Ontario Int.	00:53+1 день Denver Denver International	3h 54m layover 0h 43m - Las Vegas	Frontier Airlines	F94206 F94612
from $65 Find flight	12:38 Ontario Ontario Int.	19:10 Denver Denver International	5h 32m layover 2h 24m - Las Vegas	Frontier Airlines	F91358 F94612
from $65 Find flight	08:04 Ontario Ontario Int.	18:40 Denver Denver International	9h 36m layover 6h 22m - Las Vegas	Frontier Airlines	F91358 F92430
from $65 Find flight	09:26 Ontario Ontario Int.	23:48 Denver Denver International	13h 22m layover 10h 11m - Las Vegas	Frontier Airlines	F92010 F94612
from $65 Find flight	09:26 Ontario Ontario Int.	03:59+1 день Denver Denver International	17h 33m layover 14h 26m - Las Vegas	Frontier Airlines	F92010 F92430
from $65 Find flight	13:05 Ontario Ontario Int.	09:04+1 день Denver Denver International	18h 59m layover 15h 41m - Las Vegas	Frontier Airlines	F91358 F92016
from $65 Find flight	09:26 Ontario Ontario Int.	09:38+1 день Denver Denver International	23h 12m layover 19h 57m - Las Vegas	Frontier Airlines	F91358 F91994
from $65 Find flight	08:04 Ontario Ontario Int.	09:29+1 день Denver Denver International	24h 25m layover 21h 13m - Las Vegas	Frontier Airlines	F94758 F92016
from $77 Find flight	16:48 Ontario Ontario Int.	00:50+1 день Denver Denver International	7h 2m layover 1h 21m - Houston	Frontier Airlines	F93132 F94855
from $90 Find flight	17:30 Ontario Ontario Int.	22:54 Denver Denver International	4h 24m layover 1h 5m - Las Vegas	Frontier Airlines	F92232 F94612

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*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on March 13, 2025

Flight Schedule Ontario (California) to Denver (Colorado)

Full flight schedule will help you in detecting at what time planes fly from Ontario to Denver. 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	Flight Details	Flight Duration	Price
00:49 — 04:10	00:49 — 04:10 F91500 Frontier Airlines Ontario — Denver	2h 21m	Find flight from$35
05:05 — 08:25	05:05 — 08:25 UA2357 United Airlines Ontario — Denver	2h 20m	Find flight from$113
05:05 — 08:24	05:05 — 08:24 UA1575 United Airlines Ontario — Denver	2h 19m	Find flight from$155
05:05 — 08:25	05:05 — 08:25 UA652 United Airlines Ontario — Denver	2h 20m	Find flight from$163
05:05 — 08:23	05:05 — 08:23 UA2329 United Airlines Ontario — Denver	2h 18m	Find flight from$236
05:10 — 08:29	05:10 — 08:29 UA2317 United Airlines Ontario — Denver	2h 19m	Find flight from$129
10:39 — 13:57	10:39 — 13:57 F91262 Frontier Airlines Ontario — Denver	2h 18m	Find flight from$35
13:40 — 17:00	13:40 — 17:00 UA745 United Airlines Ontario — Denver	2h 20m	Find flight from$176
13:44 — 17:03	13:44 — 17:03 UA1942 United Airlines Ontario — Denver	2h 19m	Find flight from$155
13:45 — 17:04	13:45 — 17:04 UA2278 United Airlines Ontario — Denver	2h 19m	Find flight from$129
16:51 — 20:09	16:51 — 20:09 F92908 Frontier Airlines Ontario — Denver	2h 18m	Find flight from$47
18:30 — 21:49	18:30 — 21:49 UA1108 United Airlines Ontario — Denver	2h 19m	Find flight from$236
06:00 — 15:49	06:00 — 08:54 AS1091 Alaska Airlines Ontario — Seattle 3h 6m stop 12:00 — 15:49 AS602 Alaska Airlines Seattle — Denver	8h 49m including layover	Find flight from$140
06:57 — 16:21	06:30 — 11:32 F91406 Frontier Airlines Ontario — Dallas 2h 47m stop 15:42 — 16:57 F92631 Frontier Airlines Dallas — Denver	8h 24m including layover	Find flight from$84
08:04 — 18:40	13:17 — 14:29 F91358 Frontier Airlines Ontario — Las Vegas 6h 22m stop 00:59 — 03:59 F92430 Frontier Airlines Las Vegas — Denver	9h 36m including layover	Find flight from$65
08:04 — 09:29 +1 day	08:04 — 09:12 F94758 Frontier Airlines Ontario — Las Vegas 21h 13m stop 06:25 — 09:29 F92016 Frontier Airlines Las Vegas — Denver	24h 25m including layover	Find flight from$65
09:26 — 23:48	09:26 — 10:33 F92010 Frontier Airlines Ontario — Las Vegas 10h 11m stop 20:44 — 23:48 F94612 Frontier Airlines Las Vegas — Denver	13h 22m including layover	Find flight from$65
09:26 — 03:59 +1 day	09:26 — 10:33 F92010 Frontier Airlines Ontario — Las Vegas 14h 26m stop 00:59 — 03:59 F92430 Frontier Airlines Las Vegas — Denver	17h 33m including layover	Find flight from$65
10:39 — 19:40	10:35 — 12:08 UA4639 United Airlines Ontario — San Francisco 3h 40m stop 16:00 — 19:40 UA566 United Airlines San Francisco — Denver	8h 1m including layover	Find flight from$141
11:46 — 18:36	13:17 — 14:29 F91358 Frontier Airlines Ontario — Las Vegas 2h 43m stop 17:46 — 20:51 F93844 Frontier Airlines Las Vegas — Denver	5h 50m including layover	Find flight from$100
11:58 — 14:53 +1 day	11:58 — 17:11 F93132 Frontier Airlines Ontario — Houston 20h 3m stop 13:14 — 14:53 F93227 Frontier Airlines Houston — Denver	25h 55m including layover	Find flight from$107
12:34 — 18:40	17:26 — 18:36 F92232 Frontier Airlines Ontario — Las Vegas 1h 52m stop 00:59 — 03:59 F92430 Frontier Airlines Las Vegas — Denver	5h 6m including layover	Find flight from$71
12:38 — 19:10	13:17 — 14:29 F91358 Frontier Airlines Ontario — Las Vegas 2h 24m stop 20:33 — 23:36 F94612 Frontier Airlines Las Vegas — Denver	5h 32m including layover	Find flight from$65
13:05 — 09:04 +1 day	13:17 — 14:29 F91358 Frontier Airlines Ontario — Las Vegas 15h 41m stop 08:18 — 11:19 F92016 Frontier Airlines Las Vegas — Denver	18h 59m including layover	Find flight from$65
14:00 — 07:34 +1 day	14:00 — 19:16 F93132 Frontier Airlines Ontario — Houston 10h 44m stop 06:00 — 07:34 F93229 Frontier Airlines Houston — Denver	16h 34m including layover	Find flight from$71
15:24 — 03:59 +1 day	15:24 — 16:34 F91284 Frontier Airlines Ontario — Las Vegas 8h 25m stop 00:59 — 03:59 F92430 Frontier Airlines Las Vegas — Denver	11h 35m including layover	Find flight from$71
15:52 — 09:27 +1 day	11:46 — 12:56 F92232 Frontier Airlines Ontario — Las Vegas 13h 20m stop 06:25 — 09:27 F93844 Frontier Airlines Las Vegas — Denver	16h 35m including layover	Find flight from$95
16:48 — 00:50 +1 day	13:45 — 18:58 F93132 Frontier Airlines Ontario — Houston 1h 21m stop 20:20 — 22:00 F94855 Frontier Airlines Houston — Denver	7h 2m including layover	Find flight from$77
17:30 — 22:54	17:26 — 18:36 F92232 Frontier Airlines Ontario — Las Vegas 1h 5m stop 20:33 — 23:36 F94612 Frontier Airlines Las Vegas — Denver	4h 24m including layover	Find flight from$90
17:30 — 01:06 +1 day	15:56 — 17:09 F92232 Frontier Airlines Ontario — Las Vegas 3h 17m stop 21:36 — 00:32 F94968 Frontier Airlines Las Vegas — Denver	6h 36m including layover	Find flight from$90
18:44 — 09:38 +1 day	18:44 — 19:53 F94206 Frontier Airlines Ontario — Las Vegas 10h 37m stop 06:30 — 09:38 F91994 Frontier Airlines Las Vegas — Denver	13h 54m including layover	Find flight from$65
19:06 — 08:01 +1 day	19:06 — 21:52 F91122 Frontier Airlines Ontario — Salt Lake City 8h 23m stop 06:15 — 08:01 F93862 Frontier Airlines Salt Lake City — Denver	11h 55m including layover	Find flight from$83
19:59 — 00:53 +1 day	22:58 — 23:59 F94206 Frontier Airlines Ontario — Las Vegas 43m stop 20:44 — 23:48 F94612 Frontier Airlines Las Vegas — Denver	3h 54m including layover	Find flight from$62
20:59 — 09:27 +1 day	18:44 — 19:53 F94206 Frontier Airlines Ontario — Las Vegas 8h 17m stop 16:45 — 19:48 F93844 Frontier Airlines Las Vegas — Denver	11h 28m including layover	Find flight from$86
22:58 — 03:59 +1 day	22:58 — 23:59 F94206 Frontier Airlines Ontario — Las Vegas 1h stop 00:59 — 03:59 F92430 Frontier Airlines Las Vegas — Denver	4h 1m including layover	Find flight from$64
22:59 — 08:43 +1 day	22:59 — 01:27 F92404 Frontier Airlines Ontario — Phoenix 5h 18m stop 06:45 — 08:43 F91376 Frontier Airlines Phoenix — Denver	8h 44m including layover	Find flight from$96

Departure	Arrival	Flight Details	Flight Time	Price
		stop stop	including layover	Find flight from$

*Departure and arrival times - local. Updated on March 13, 2025

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 00:49 to 22:59 from 2 Ontario airports and arrive 00:49 to 22:59 to 2 Denver airports. Average flight time is 2h 19m.

The fastest flight 2h 18m
Average flight time 2h 19m
The earliest flight 00:49
The latest flight 22:59
Distance 818 ml

The cheapest months to travel to Denver are november (from 35 $), january (from 47 $), december (from 47 $).

The most expensive months are february (from 50 $), december (from 47 $), january (from 47 $).

What is the lowest airfare Ontario to Denver?

The cheapest plane ticket found by our users is $35. This airfare is for economy class on one-way F91500 flight by Frontier Airlines for February 21, 2025 which leaves Ontario Int. in Ontario at 00:49 am and arrives at Denver Denver International at 04:10.

Economy class

$35

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Business class

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First class

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Popular Airlines on the Route

The flight Ontario — Denver is served by 4 regular airlines and 2 low-cost airlines. Most of the flights on this route are operated by Alaska Airlines - 69 departures per week at the price of from $ 140 . And the most expensive tickets are offered by Volaris airline - from $ 991.

Direct flights

There are 12 nonstop flights on the route. The fastest direct flight is F91262 by Frontier Airlines takes 2h 18m and the cheapest is F91500 by Frontier Airlines for $35.

F9 - Frontier Airlines

from $35

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UA - United Airlines

from $113

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Connecting Flights

There are 205 flights with layovers on the route. The fastest connecting flight is F94206 by Frontier Airlines takes 3h 54m and the cheapest is F91500 by Frontier Airlines for $62.

AS - Alaska Airlines

from $140

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F9 - Frontier Airlines

from $62

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Y4 - Volaris

from $409

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UA - United Airlines

from $141

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See more connecting flights

Airports

You can fly from Ontario to Denver from 2 airports (Ontario Int., International Heliport).

Ontario airports

Ontario Int.-ONT

from $35
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International Heliport-JIO

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Denver airports

Denver International-DEN

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Arapahoe Co-APA

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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.

Ontario — Phoenix

from $56

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Ontario — Denver

from $65

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Ontario — Austin

from $67

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Ontario — Miami

from $62

Find
Ontario — Tucson

from $80

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Ontario — Las Vegas

from $63

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Ontario — Seattle

from $65

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Ontario — Boise

from $70

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Ontario — Chicago

from $78

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Ontario — Philadelphia

from $62

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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.

Ontario — London

from $62

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Ontario — San Jose

from $61

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Ontario — Guadalajara

from $70

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Ontario — Cancun

from $74

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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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