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.

$20 CHEAP FLIGHTS from Colorado to Ontario

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Cheap Flights from Colorado to Ontario

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Colorado to Ontario

Wed, Dec 16 - Mon, Dec 21

9:20 am - 10:45 amDEN Denver Intl-ONT Ontario

2h 25mnonstop

6:30 am - 9:54 amONT Ontario-DEN Denver Intl

2h 24mnonstop

$74Frontier

Tue, Nov 24 - Sat, Dec 5

10:52 pm - 12:14 amDEN Denver Intl-ONT Ontario

2h 22mnonstop

6:00 am - 9:24 amONT Ontario-DEN Denver Intl

2h 24mnonstop

$74Frontier

Thu, Dec 3 - Mon, Dec 7

3:22 pm - 10:59 pmDEN Denver Intl-ONT Ontario

8h 37m1 stop Seattle/Tacoma Intl

6:00 am - 9:24 amONT Ontario-DEN Denver Intl

2h 24mnonstop

$121Multiple Airlines

Sat, Dec 5 - Mon, Dec 7

7:24 pm - 11:13 amDEN Denver Intl-ONT Ontario

16h 49m1 stop Seattle/Tacoma Intl

11:30 am - 2:55 pmONT Ontario-DEN Denver Intl

2h 25mnonstop

$122Multiple Airlines

Tue, Nov 24 - Tue, Nov 24

5:45 am - 8:50 amDEN Denver Intl-ONT Ontario

4h 05m1 stop Las Vegas Harry Reid Intl

12:45 pm - 4:00 pmONT Ontario-DEN Denver Intl

2h 15mnonstop

$141Southwest

Mon, Nov 23 - Thu, Nov 26

12:45 pm - 2:05 pmDEN Denver Intl-ONT Ontario

2h 20mnonstop

11:45 am - 2:55 pmONT Ontario-DEN Denver Intl

2h 10mnonstop

$144Southwest

Tue, Dec 22 - Tue, Jan 5

7:35 pm - 9:00 pmDEN Denver Intl-ONT Ontario

2h 25mnonstop

1:42 pm - 5:01 pmONT Ontario-DEN Denver Intl

2h 19mnonstop

$185United Airlines

Sat, Dec 5 - Tue, Dec 8

7:45 pm - 9:11 pmDEN Denver Intl-ONT Ontario

2h 26mnonstop

1:40 pm - 4:55 pmONT Ontario-DEN Denver Intl

2h 15mnonstop

$231United Airlines

Thu, Dec 3 - Mon, Dec 7

6:05 pm - 11:57 pmCOS Colorado Springs-ONT Ontario

6h 52m1 stop Salt Lake City

5:04 pm - 10:24 pmONT Ontario-COS Colorado Springs

4h 20m1 stop Salt Lake City

$311Delta

Sat, Dec 5 - Mon, Dec 7

8:02 am - 12:17 pmCOS Colorado Springs-ONT Ontario

5h 15m1 stop Salt Lake City

5:04 pm - 10:24 pmONT Ontario-COS Colorado Springs

4h 20m1 stop Salt Lake City

$311Delta

Recent last minute flight deals from Colorado to Ontario

Sun, Nov 1 - Wed, Nov 11

7:30 am - 11:16 amDEN Denver Intl-ONT Ontario

4h 46m1 stop Las Vegas Harry Reid Intl

5:07 pm - 11:44 pmONT Ontario-DEN Denver Intl

5h 37m1 stop Las Vegas Harry Reid Intl

$116Frontier

Mon, Nov 2 - Wed, Nov 11

1:05 pm - 4:21 pmDEN Denver Intl-ONT Ontario

4h 16m1 stop Las Vegas Harry Reid Intl

5:07 pm - 11:44 pmONT Ontario-DEN Denver Intl

5h 37m1 stop Las Vegas Harry Reid Intl

$126Frontier

Wed, Nov 4 - Fri, Nov 13

1:15 pm - 4:23 pmGJT Grand Junction Regnl-ONT Ontario

4h 08m1 stop Salt Lake City

6:00 am - 12:39 pmONT Ontario-GJT Grand Junction Regnl

5h 39m1 stop Salt Lake City

$411Delta

Tue, Nov 3 - Fri, Nov 13

1:15 pm - 10:43 pmGJT Grand Junction Regnl-ONT Ontario

10h 28m2 stops Salt Lake City Seattle/Tacoma Intl

6:00 am - 12:39 pmONT Ontario-GJT Grand Junction Regnl

5h 39m1 stop Salt Lake City

$416Delta

Sat, Oct 31 - Tue, Nov 3

12:06 pm - 3:16 pmGJT Grand Junction Regnl-ONT Ontario

4h 10m1 stop Phoenix Sky Harbor Intl

6:30 am - 11:28 amONT Ontario-GJT Grand Junction Regnl

3h 58m1 stop Phoenix Sky Harbor Intl

$433American Airlines

Thu, Nov 5 - Sun, Nov 8

6:48 pm - 9:53 pmGJT Grand Junction Regnl-ONT Ontario

4h 05m1 stop Phoenix Sky Harbor Intl

7:49 pm - 12:30 amONT Ontario-GJT Grand Junction Regnl

3h 41m1 stop Phoenix Sky Harbor Intl

$449American Airlines

Mon, Nov 2 - Wed, Nov 4

10:15 am - 2:05 pmCOS Colorado Springs-ONT Ontario

4h 50m1 stop Denver Intl

3:50 pm - 8:50 pmONT Ontario-COS Colorado Springs

4h 00m1 stop Phoenix Sky Harbor Intl

$562Southwest

Mon, Nov 2 - Wed, Nov 4

12:40 pm - 4:40 pmCOS Colorado Springs-ONT Ontario

5h 00m1 stop Las Vegas Harry Reid Intl

12:50 pm - 8:55 pmONT Ontario-COS Colorado Springs

7h 05m2 stops Phoenix Sky Harbor Intl Las Vegas Harry Reid Intl

$567Southwest

Sat, Oct 31 - Wed, Nov 4

7:15 am - 12:33 pmMTJ Montrose County-ONT Ontario

6h 18m1 stop Denver Intl

1:29 pm - 8:30 pmONT Ontario-MTJ Montrose County

6h 01m1 stop Denver Intl

$599United Airlines

Thu, Nov 5 - Sun, Nov 8

7:05 am - 12:33 pmMTJ Montrose County-ONT Ontario

6h 28m1 stop Denver Intl

5:00 am - 12:36 pmONT Ontario-MTJ Montrose County

6h 36m1 stop Denver Intl

$599United Airlines

Useful Info

Low season	January
High season	November
Cheapest flight	$20

Best time to beat the crowds with an average 9% drop in price.

Most popular time to fly and prices are also 5% lower on average.

Flight from Denver 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.