ONT

$39 Find Cheap Flights from Colorado to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 5/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from Colorado to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Colorado to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Colorado to Ontario

Tue, May 26 - Wed, May 27
Frontier Logo
8:41 am - 10:05 am
DEN
-
ONT
2h 24mnonstop
Frontier Logo
6:00 am - 9:22 am
ONT
-
DEN
2h 22mnonstop
$71Frontier
Tue, May 19 - Wed, May 20
Frontier Logo
10:29 pm - 11:49 pm
DEN
-
ONT
2h 20mnonstop
Frontier Logo
6:00 am - 9:22 am
ONT
-
DEN
2h 22mnonstop
$77Frontier
Tue, May 12 - Wed, May 13
Frontier Logo
10:29 pm - 11:49 pm
DEN
-
ONT
2h 20mnonstop
Frontier Logo
6:00 am - 9:22 am
ONT
-
DEN
2h 22mnonstop
$79Frontier
Tue, May 19 - Tue, May 19
Delta Logo
8:15 am - 12:19 pm
COS
-
ONT
5h 04m
1 stop
Delta Logo
4:57 pm - 10:22 pm
ONT
-
COS
4h 25m
1 stop
$197Delta
Tue, May 19 - Wed, May 20
Delta Logo
8:15 am - 12:19 pm
COS
-
ONT
5h 04m
1 stop
Delta Logo
6:00 am - 11:15 am
ONT
-
COS
4h 15m
1 stop
$228Delta
Thu, May 28 - Wed, Jun 3
United Airlines Logo
12:56 pm - 5:28 pm
COS
-
ONT
5h 32m
1 stop
United Airlines Logo
6:30 pm - 11:59 pm
ONT
-
COS
4h 29m
1 stop
$237United Airlines
Sun, May 31 - Sun, Jun 7
Multiple Airlines Logo
1:23 pm - 3:09 pm
GJT
-
ONT
26h 46m
1 stop
Multiple Airlines Logo
3:30 pm - 7:55 pm
ONT
-
GJT
27h 25m
2 stops
$255Multiple Airlines
Sun, May 31 - Sun, Jun 7
Multiple Airlines Logo
1:23 pm - 3:09 pm
GJT
-
ONT
26h 46m
1 stop
Multiple Airlines Logo
3:30 pm - 7:55 pm
ONT
-
GJT
27h 25m
2 stops
$260Multiple Airlines
Sat, May 23 - Sat, May 30
Southwest Logo
1:10 pm - 9:20 pm
COS
-
ONT
9h 10m
1 stop
Southwest Logo
5:30 am - 10:50 am
ONT
-
COS
4h 20m
1 stop
$263Southwest
Tue, Aug 18 - Sat, Aug 22
United Airlines Logo
12:51 pm - 8:04 pm
COS
-
ONT
8h 13m
2 stops
United Airlines Logo
1:18 pm - 8:44 pm
ONT
-
COS
6h 26m
1 stop
$264United Airlines
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Good to know

Low seasonJanuary
Cheapest flight$39
Most popular time to fly and prices are also 13% lower on average.
Flight from Denver to Ontario

FAQs for booking flights from Colorado to Ontario

  • How does KAYAK find such low prices on flights from Colorado to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Colorado to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Colorado to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Colorado is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Colorado to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Colorado with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Colorado to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)