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Cheap flights from Ontario to Colorado from $140

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Colorado departing on 2/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:00 am - 6:33 pm
YOW
-
COS
10h 33m2 stops
United Airlines Logo
3:26 pm - 9:11 am
COS
-
YOW
15h 45m2 stops
$311United Airlines
Tue, Apr 14 - Mon, Apr 20
Multiple Airlines Logo
7:00 am - 12:19 pm
YOW
-
DEN
31h 19m2 stops
Multiple Airlines Logo
6:32 pm - 5:13 pm
DEN
-
YOW
20h 41m1 stop
$336Multiple Airlines
Tue, Jan 20 - Tue, Jan 27
American Airlines Logo
1:14 pm - 11:16 pm
YYZ
-
DEN
12h 02m1 stop
American Airlines Logo
7:00 am - 9:29 pm
DEN
-
YYZ
12h 29m1 stop
$368American Airlines
Wed, Feb 11 - Sat, Feb 14
Air Canada Logo
5:25 pm - 7:55 pm
YUL
-
DEN
4h 30mnonstop
Air Canada Logo
8:05 am - 7:25 pm
DEN
-
YUL
9h 20m1 stop
$369Air Canada
Mon, Jan 12 - Sun, Jan 18
Air Canada Logo
8:30 am - 10:23 am
YYZ
-
DEN
3h 53mnonstop
Air Canada Logo
5:30 pm - 10:41 pm
DEN
-
YYZ
3h 11mnonstop
$370Air Canada
Wed, Feb 25 - Sun, Mar 1
Alaska Airlines Logo
4:45 pm - 11:58 pm
YYZ
-
DEN
33h 13m2 stops
Alaska Airlines Logo
7:00 am - 3:35 pm
DEN
-
YYZ
30h 35m1 stop
$375Alaska Airlines
Sun, Feb 1 - Sun, Feb 8
Alaska Airlines Logo
4:55 pm - 6:28 pm
YYZ
-
DEN
27h 33m2 stops
Alaska Airlines Logo
6:03 pm - 3:45 pm
DEN
-
YYZ
19h 42m2 stops
$379Alaska Airlines
Tue, Apr 7 - Tue, Apr 14
American Airlines Logo
6:15 pm - 11:59 am
YYZ
-
COS
19h 44m1 stop
American Airlines Logo
6:00 am - 10:39 pm
COS
-
YYZ
14h 39m1 stop
$425American Airlines
Sat, Mar 21 - Sat, Mar 28
WestJet Logo
6:20 am - 7:29 pm
YKF
-
DEN
15h 09m2 stops
WestJet Logo
6:14 am - 5:28 am
DEN
-
YKF
21h 14m2 stops
$683WestJet
Thu, Jan 22 - Fri, Jan 23
WestJet Logo
6:20 am - 9:06 pm
YKF
-
DEN
16h 46m2 stops
WestJet Logo
5:45 am - 5:29 am
DEN
-
YKF
21h 44m2 stops
$726WestJet
Tue, Feb 17 - Wed, Feb 18

Alaska Airlines flights from Region of Ontario to Colorado

Our best Alaska Airlines deals on Region of Ontario to Colorado flight tickets
Alaska Airlines
Feb 1
YYZ4:45 pmToronto Pearson Intl
33h 13m
2 stops
DEN11:58 pmDenver Intl
Feb 8
DEN7:00 amDenver Intl
30h 35m
1 stop
YYZ3:35 pmToronto Pearson Intl
$375
Find similar
Alaska Airlines
Apr 7
YYZ4:55 pmToronto Pearson Intl
27h 33m
2 stops
DEN6:28 pmDenver Intl
Apr 14
DEN6:03 pmDenver Intl
19h 42m
2 stops
YYZ3:45 pmToronto Pearson Intl
$379
Find similar
Alaska Airlines
Feb 11
YYZ4:45 pmToronto Pearson Intl
27h 03m
2 stops
DEN5:48 pmDenver Intl
Feb 14
DEN12:34 pmDenver Intl
25h 01m
1 stop
YYZ3:35 pmToronto Pearson Intl
$383
Find similar

WestJet flights from Region of Ontario to Colorado

Our best WestJet deals on Region of Ontario to Colorado flight tickets
WestJet
May 21
YKF6:00 amToronto Region of Waterloo Intl
14h 50m
1 stop
DEN6:50 pmDenver Intl
May 30
DEN12:15 pmDenver Intl
10h 30m
1 stop
YKF12:45 amToronto Region of Waterloo Intl
$486
Find similar
WestJet
May 21
YHM6:10 pmHamilton
26h 40m
1 stop
DEN6:50 pmDenver Intl
May 30
DEN12:15 pmDenver Intl
26h 55m
1 stop
YHM5:10 pmHamilton
$651
Find similar
WestJet
Dec 31
YYZ6:30 amToronto Pearson Intl
34h 43m
2 stops
DEN3:13 pmDenver Intl
Feb 10
DEN6:14 amDenver Intl
16h 12m
2 stops
YYZ12:26 amToronto Pearson Intl
$761
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Region of Ontario to Colorado that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 24, 2025.
Use the filters below to find and compare flights from Ontario to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OttawaColorado Springs

YOW - COS

YOWCOS

Ottawa

Tue 4/14

10:00 am-6:33 pm

2 stops10h 33m

Colorado Springs

Mon 4/20

3:26 pm-9:11 am

2 stops15h 45m

$311

OttawaDenver

YOW - DEN

YOWDEN

Ottawa

Tue 1/20

7:00 am-12:19 pm

2 stops31h 19m

Denver Intl

Tue 1/27

6:32 pm-5:13 pm

1 stop20h 41m

$336

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 2/11

1:14 pm-11:16 pm

1 stop12h 02m

Denver Intl

Sat 2/14

7:00 am-9:29 pm

1 stop12h 29m

$368

MontrealDenver

YUL - DEN

YULDEN

Montreal Pierre Elliott Trudeau Intl

Mon 1/12

5:25 pm-7:55 pm

Nonstop4h 30m

Denver Intl

Sun 1/18

8:05 am-7:25 pm

1 stop9h 20m

$369

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Wed 2/25

8:30 am-10:23 am

Nonstop3h 53m

Denver Intl

Sun 3/1

5:30 pm-10:41 pm

Nonstop3h 11m

$370

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Sun 2/1

4:45 pm-11:58 pm

2 stops33h 13m

Denver Intl

Sun 2/8

7:00 am-3:35 pm

1 stop30h 35m

$375

TorontoDenver

YYZ - DEN

YYZDEN

Toronto Pearson Intl

Tue 4/7

4:55 pm-6:28 pm

2 stops27h 33m

Denver Intl

Tue 4/14

6:03 pm-3:45 pm

2 stops19h 42m

$379

TorontoColorado Springs

YYZ - COS

YYZCOS

Toronto Pearson Intl

Sat 3/21

6:15 pm-11:59 am

1 stop19h 44m

Colorado Springs

Sat 3/28

6:00 am-10:39 pm

1 stop14h 39m

$425

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Thu 1/22

6:20 am-7:29 pm

2 stops15h 09m

Denver Intl

Fri 1/23

6:14 am-5:28 am

2 stops21h 14m

$683

TorontoDenver

YKF - DEN

YKFDEN

Toronto Region of Waterloo Intl

Tue 2/17

6:20 am-9:06 pm

2 stops16h 46m

Denver Intl

Wed 2/18

5:45 am-5:29 am

2 stops21h 44m

$726

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Colorado from

How to get the cheapest flight ticket from Region of Ontario to Colorado

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Colorado?

The month of November is, on average, the cheapest month to fly to Colorado from Region of Ontario, with most prices found around $394. The month of August is another great option to travel to Colorado, with average flight prices from Region of Ontario averaging around $418.

What is the cheapest day to depart on your flight to Colorado?

The cheapest day to depart from Region of Ontario to Colorado is on a Friday when prices can be found for as low as $437. On the other hand, Sunday is the most expensive day to depart from Region of Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $601.

What is the cheapest time of day to depart on your flight to Colorado?

The cheapest time of day to fly to Colorado is at noon when flights can be purchased for as low as $452. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $515 per ticket.

What is the cheapest Ontario to Colorado flight route?

Fly from Toronto Pearson Intl to Denver Intl for the best Ontario - Colorado flight prices

How far in advance should I book a flight to Colorado?

You are more likely to see cheaper flights to Colorado from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $448 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from Region of Ontario for as low as $408 on momondo.

What cabin class options are available on Ontario to Colorado flights?

There are 4 cabin classes available to choose from on Ontario to Colorado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Region of Ontario to Colorado flights?

You could potentially save up to 22% on your flight if you consider stops on a Region of Ontario to Colorado flight.

Cheap Region of Ontario to Colorado flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Colorado

Best Price Found

$282

Fastest flight time

3h 46m

Direct flights

Every day

Airports in Colorado

87 airports
The best one-way flight to Colorado from Region of Ontario in the past 72 hours is $282. The best round-trip flight deal from Region of Ontario to Colorado found on momondo in the last 72 hours is $472.
The fastest flight from Region of Ontario to Colorado takes 3h 46m
Direct flights go from Region of Ontario to Colorado every day.
There are 87 airports in Colorado. From Region of Ontario there are direct flights to Denver Intl (DEN).
Search flight deals

  • When did momondo last update prices for flights from Ontario to Colorado?

    Prices for flights from Ontario to Colorado were last updated today.

  • How many operators does momondo search for flights from Ontario to Colorado?

  • How old do you have to be to fly from Ontario to Colorado?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario to Colorado.

  • What documentation or ID do you need to fly to Colorado?

    The required travel and health documents for your Colorado trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Colorado. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Region of Ontario to Colorado?

Best airlines flying from Region of Ontario to Colorado

Compare and see reviews for airlines that fly from Region of Ontario to Colorado with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $251Free CancellationRating
7.4
9,110 reviews
Search United Airlines flights
Air CanadaPriceFrom $267Free CancellationRating
7.1
10,554 reviews
Search Air Canada flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Colorado?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Colorado. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Colorado with flexible booking policies on momondo?

Flights from Ontario to Colorado with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to Colorado?

Once all potential Ontario to Colorado flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Ontario to Colorado right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Colorado flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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