ONT

$43 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 1/16. 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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Everything you should know

Cheapest round-trip
$69
Overall average: $110
Frontier
Tue 1/20Thu 1/22
DEN - ONT • Non-stop
Cheapest one-way
$43
Typical prices: $49-$161
Frontier
Fri 1/16
DEN - ONT • Non-stop
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Flight Deals
Useful Info
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, Jan 20 - Thu, Jan 22
Frontier Logo
1:34 pm - 3:07 pm
DEN
-
ONT
2h 33mnonstop
Frontier Logo
6:20 am - 9:40 am
ONT
-
DEN
2h 20mnonstop
$69Frontier
Wed, Jan 14 - Mon, Jan 19
Frontier Logo
9:20 pm - 10:59 pm
DEN
-
ONT
2h 39mnonstop
Frontier Logo
6:10 am - 9:30 am
ONT
-
DEN
2h 20mnonstop
$70Frontier
Mon, Jan 5 - Sun, Jan 11
Delta Logo
7:40 am - 12:16 pm
GJT
-
ONT
5h 36m1 stop
Delta Logo
5:07 pm - 10:02 pm
ONT
-
GJT
3h 55m1 stop
$211Delta
Thu, Jan 15 - Thu, Jan 22
Delta Logo
7:59 am - 12:16 pm
COS
-
ONT
5h 17m1 stop
Delta Logo
6:00 am - 11:17 am
ONT
-
COS
4h 17m1 stop
$213Delta
Thu, Jan 29 - Tue, Feb 3
American Airlines Logo
12:12 pm - 6:20 pm
ASE
-
ONT
7h 08m1 stop
American Airlines Logo
6:00 am - 4:28 pm
ONT
-
ASE
9h 28m1 stop
$229American Airlines
Thu, Jan 29 - Tue, Feb 3
American Airlines Logo
12:12 pm - 6:20 pm
ASE
-
ONT
7h 08m1 stop
American Airlines Logo
6:22 am - 7:04 pm
ONT
-
ASE
11h 42m2 stops
$234American Airlines
Tue, Feb 3 - Wed, Feb 4
United Airlines Logo
3:30 pm - 8:58 pm
COS
-
ONT
6h 28m1 stop
United Airlines Logo
1:24 pm - 9:06 pm
ONT
-
COS
6h 42m1 stop
$267United Airlines
Tue, Feb 3 - Wed, Feb 4
United Airlines Logo
11:33 am - 10:53 pm
COS
-
ONT
12h 20m2 stops
United Airlines Logo
1:24 pm - 9:06 pm
ONT
-
COS
6h 42m1 stop
$272United Airlines
Sat, Feb 28 - Sat, Mar 7
Alaska Airlines Logo
4:23 pm - 11:32 pm
EGE
-
ONT
8h 09m1 stop
Alaska Airlines Logo
4:02 pm - 5:20 pm
ONT
-
EGE
24h 18m1 stop
$404Alaska Airlines
Wed, Feb 25 - Sat, Feb 28
Alaska Airlines Logo
4:23 pm - 11:52 pm
EGE
-
ONT
32h 29m2 stops
Alaska Airlines Logo
7:00 am - 6:20 pm
ONT
-
EGE
34h 20m2 stops
$491Alaska Airlines
Useful Info

Good to know

Low seasonSeptember
Cheapest flight$43
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 19% increase in price.
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)