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$44 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 8/23. 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
0 bags
Sat 7/6
Sat 7/13

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In the last 7 days travelers have searched 43,995,393 times on KAYAK, and here is why:

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Good to know

Low season

January

High season

May

Cheapest flight

$44
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 7% 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.

See more FAQs

Prefer to fly non-stop from Colorado to Ontario?

Find which airlines fly direct from Colorado to Ontario, which days they fly and book direct flights.

Nonstop departures

Colorado to Ontario

Monday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Tuesday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Wednesday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Thursday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Friday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Saturday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Sunday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

See more direct flights

Nonstop returns

Ontario to Colorado

Monday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Tuesday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Wednesday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Thursday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

Friday

Aeromexico, Air Canada, Air France, +22 more

Aeromexico, Air Canada, +23 more

Saturday

Aeromexico, Air Canada, Air France, +23 more

Aeromexico, Air Canada, +24 more

Sunday

Aeromexico, Air Canada, Air France, +24 more

Aeromexico, Air Canada, +25 more

See more direct flights
See more direct flights

Book cheap flights from Colorado to Ontario

Recent round-trip flight deals

8/14Wed
nonstopFrontier
2h 19mDEN-ONT
8/20Tue
nonstopFrontier
2h 21mONT-DEN
$48
8/16Fri
nonstopFrontier
2h 22mDEN-ONT
8/19Mon
nonstopFrontier
2h 21mONT-DEN
$53
7/4Thu
1 stop
8h 17mDEN-ONT
7/13Sat
nonstop
2h 32mONT-DEN
$152
7/2Tue
1 stopDelta
6h 05mDEN-ONT
7/6Sat
1 stopDelta
4h 51mONT-DEN
$206
7/17Wed
2 stops
13h 01mDEN-ONT
7/19Fri
nonstop
2h 20mONT-DEN
$215
7/5Fri
1 stopDelta
6h 05mDEN-ONT
7/10Wed
1 stopDelta
4h 50mONT-DEN
$216
8/16Fri
1 stopAmerican Airlines
3h 52mDEN-ONT
8/20Tue
1 stopAmerican Airlines
4h 28mONT-DEN
$237
7/4Thu
1 stopUnited Airlines
4h 33mCOS-ONT
7/10Wed
1 stopUnited Airlines
4h 34mONT-COS
$260
7/1Mon
1 stopUnited Airlines
4h 40mCOS-ONT
7/2Tue
1 stopUnited Airlines
4h 34mONT-COS
$320
7/3Wed
1 stopAmerican Airlines
8h 40mCOS-ONT
7/14Sun
1 stopAmerican Airlines
8h 55mONT-COS
$334

Search by stops

Search by airline

Search by price

Recent one-way flight deals

8/23Fri
nonstopFrontier
2h 19mDEN-ONT
$44
9/22Sun
nonstopFrontier
2h 19mDEN-ONT
$45
8/19Mon
1 stopDelta
6h 24mDEN-ONT
$98
8/31Sat
1 stopAlaska Airlines
8h 17mDEN-ONT
$109
7/5Fri
1 stopAmerican Airlines
8h 57mDEN-ONT
$117
7/5Fri
1 stopDelta
6h 05mDEN-ONT
$118
7/4Thu
1 stopAlaska Airlines
7h 11mDEN-ONT
$128
6/18Tue
nonstopSouthwest
2h 15mDEN-ONT
$138
6/18Tue
1 stopSouthwest
11h 10mDEN-ONT
$145
6/21Fri
1 stopAmerican Airlines
3h 48mDEN-ONT
$168

Search by stops

Search by airline

Search by price

Last minute flights from Colorado to Ontario

Last minute flight, train and bus deals

6/11Tue
nonstopFrontier
2h 22mDEN-ONT
6/18Tue
nonstopFrontier
2h 21mONT-DEN
$99
6/11Tue
nonstopFrontier
2h 22mDEN-ONT
6/12Wed
nonstopFrontier
2h 21mONT-DEN
$111
6/11Tue
multi-stopAlaska Airlines
16h 28mDEN-ONT
6/13Thu
multi-stopAlaska Airlines
6h 34mONT-DEN
$534
6/9Sun
multi-stopAmerican Airlines
4h 54mGJT-ONT
6/16Sun
multi-stopAmerican Airlines
9h 06mONT-GJT
$592
6/9Sun
multi-stopAmerican Airlines
12h 05mGJT-ONT
6/16Sun
multi-stopAmerican Airlines
3h 57mONT-GJT
$597
6/9Sun
multi-stopUnited Airlines
6h 14mASE-ONT
6/12Wed
multi-stopUnited Airlines
5h 41mONT-ASE
$622
6/8Sat
multi-stopUnited Airlines
6h 23mEGE-ONT
6/12Wed
multi-stopUnited Airlines
4h 35mONT-EGE
$627
6/7Fri
multi-stop
9h 57mDEN-ONT
6/9Sun
multi-stop
10h 25mONT-DEN
$627
6/10Mon
multi-stopAlaska Airlines
16h 55mDEN-ONT
6/14Fri
multi-stopAlaska Airlines
6h 34mONT-DEN
$634
6/7Fri
multi-stop
9h 57mDEN-ONT
6/8Sat
nonstop
2h 20mONT-DEN
$661

Search by stops

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Search by price

Flights to Ontario

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Colorado

Cabin classes:

$648
$588
$487
$56