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.

$33 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

Tue, Oct 27 - Sat, Oct 31

9:10 am - 10:35 amDEN Denver Intl-ONT Ontario

2h 25mnonstop

6:25 am - 9:46 amONT Ontario-DEN Denver Intl

2h 21mnonstop

$66Frontier

Sat, Oct 17 - Wed, Oct 21

9:01 am - 10:29 amDEN Denver Intl-ONT Ontario

2h 28mnonstop

6:15 am - 9:41 amONT Ontario-DEN Denver Intl

2h 26mnonstop

$66Frontier

Wed, Oct 28 - Sat, Oct 31

7:07 am - 1:16 pmDEN Denver Intl-ONT Ontario

7h 09m1 stop Seattle/Tacoma Intl

6:25 am - 9:46 amONT Ontario-DEN Denver Intl

2h 21mnonstop

$123Multiple Airlines

Thu, Oct 1 - Tue, Oct 6

9:05 am - 10:30 amDEN Denver Intl-ONT Ontario

2h 25mnonstop

2:13 pm - 10:37 pmONT Ontario-DEN Denver Intl

7h 24m1 stop Seattle/Tacoma Intl

$129Multiple Airlines

Tue, Oct 27 - Sat, Oct 31

4:40 pm - 6:00 pmDEN Denver Intl-ONT Ontario

2h 20mnonstop

10:05 am - 1:15 pmONT Ontario-DEN Denver Intl

2h 10mnonstop

$157Southwest

Tue, Oct 27 - Sat, Oct 31

8:50 am - 10:15 amDEN Denver Intl-ONT Ontario

2h 25mnonstop

10:50 am - 4:20 pmONT Ontario-DEN Denver Intl

4h 30m1 stop Las Vegas Harry Reid Intl

$167Southwest

Wed, Jan 13 - Sat, Jan 16

7:05 pm - 8:20 pmDEN Denver Intl-ONT Ontario

2h 15mnonstop

5:00 am - 8:11 amONT Ontario-DEN Denver Intl

2h 11mnonstop

$237United Airlines

Tue, Feb 23 - Sat, Feb 27

7:05 pm - 8:20 pmDEN Denver Intl-ONT Ontario

2h 15mnonstop

5:00 am - 8:11 amONT Ontario-DEN Denver Intl

2h 11mnonstop

$237United Airlines

Thu, Oct 1 - Sat, Oct 10

6:11 pm - 11:47 pmCOS Colorado Springs-ONT Ontario

6h 36m1 stop Salt Lake City

5:03 pm - 10:22 pmONT Ontario-COS Colorado Springs

4h 19m1 stop Salt Lake City

$337Delta

Sat, Oct 17 - Sat, Oct 24

6:07 pm - 10:11 pmCOS Colorado Springs-ONT Ontario

5h 04m1 stop Salt Lake City

5:03 pm - 10:22 pmONT Ontario-COS Colorado Springs

4h 19m1 stop Salt Lake City

$337Delta

Recent last minute flight deals from Colorado to Ontario

Wed, Sep 16 - Sat, Sep 19

9:05 am - 10:30 amDEN Denver Intl-ONT Ontario

2h 25mnonstop

11:45 am - 3:07 pmONT Ontario-DEN Denver Intl

2h 22mnonstop

$143Frontier

Wed, Sep 16 - Sat, Sep 19

1:05 pm - 4:59 pmDEN Denver Intl-ONT Ontario

4h 54m1 stop Las Vegas Harry Reid Intl

11:45 am - 3:07 pmONT Ontario-DEN Denver Intl

2h 22mnonstop

$164Frontier

Sun, Sep 20 - Sat, Sep 26

7:30 am - 11:22 amDEN Denver Intl-ONT Ontario

4h 52m1 stop Las Vegas Harry Reid Intl

10:47 am - 6:32 pmONT Ontario-DEN Denver Intl

6h 45m1 stop Portland

$393Multiple Airlines

Sun, Sep 20 - Wed, Sep 23

7:30 am - 11:22 amDEN Denver Intl-ONT Ontario

4h 52m1 stop Las Vegas Harry Reid Intl

3:14 pm - 11:19 pmONT Ontario-DEN Denver Intl

7h 05m1 stop Seattle/Tacoma Intl

$393Multiple Airlines

Sat, Sep 19 - Wed, Nov 4

6:11 pm - 10:04 pmCOS Colorado Springs-ONT Ontario

4h 53m1 stop Salt Lake City

5:03 pm - 10:22 pmONT Ontario-COS Colorado Springs

4h 19m1 stop Salt Lake City

$405Delta

Sat, Sep 19 - Tue, Nov 3

6:11 pm - 10:04 pmCOS Colorado Springs-ONT Ontario

4h 53m1 stop Salt Lake City

5:03 pm - 10:22 pmONT Ontario-COS Colorado Springs

4h 19m1 stop Salt Lake City

$405Delta

Fri, Sep 18 - Sun, Sep 20

8:20 am - 12:06 pmGJT Grand Junction Regnl-ONT Ontario

4h 46m1 stop Phoenix Sky Harbor Intl

1:04 pm - 6:22 pmONT Ontario-GJT Grand Junction Regnl

4h 18m1 stop Phoenix Sky Harbor Intl

$444American Airlines

Wed, Sep 16 - Tue, Nov 3

6:00 am - 12:12 pmCOS Colorado Springs-ONT Ontario

7h 12m2 stops Denver Intl San Francisco

1:29 pm - 8:49 pmONT Ontario-COS Colorado Springs

6h 20m1 stop Denver Intl

$490United Airlines

Wed, Sep 16 - Sat, Oct 31

6:00 am - 12:12 pmCOS Colorado Springs-ONT Ontario

7h 12m2 stops Denver Intl San Francisco

1:29 pm - 8:49 pmONT Ontario-COS Colorado Springs

6h 20m1 stop Denver Intl

$490United Airlines

Fri, Sep 18 - Sat, Sep 19

7:00 am - 6:17 pmGJT Grand Junction Regnl-ONT Ontario

12h 17m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

6:15 am - 11:27 amONT Ontario-GJT Grand Junction Regnl

4h 12m1 stop Phoenix Sky Harbor Intl

$589American Airlines

Useful Info

Low season	January
High season	October
Cheapest flight	$33

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

Most popular time to fly and prices are also 20% 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.