Find Cheap Flights from Ontario to North America

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from Ontario to North America

(Round-trip)
Depart: Thu Nov 30 2017 Return: Wed Dec 6 2017 Trip spans 7 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 29m
nonstop
Depart: Sat Jan 20 2018 Return: Tue Jan 23 2018 Trip spans 4 days
United
United
ONT
DEN
2h 15m
nonstop
DEN
ONT
2h 23m
nonstop
Depart: Fri Dec 1 2017 Return: Tue Dec 5 2017 Trip spans 5 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 29m
nonstop
Depart: Sat Dec 2 2017 Return: Sun Dec 10 2017 Trip spans 9 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Sun Dec 3 2017 Return: Sat Dec 9 2017 Trip spans 7 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 29m
nonstop
Depart: Tue Dec 5 2017 Return: Sun Dec 10 2017 Trip spans 6 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Wed Dec 6 2017 Return: Sun Dec 10 2017 Trip spans 5 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Wed Jan 24 2018 Return: Sat Jan 27 2018 Trip spans 4 days
United
United
ONT
DEN
2h 17m
nonstop
DEN
ONT
2h 23m
nonstop
Depart: Fri Dec 8 2017 Return: Tue Dec 12 2017 Trip spans 5 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Tue Feb 13 2018 Return: Sun Feb 18 2018 Trip spans 6 days
United
United
ONT
DEN
2h 15m
nonstop
DEN
ONT
2h 22m
nonstop
Depart: Sat Dec 9 2017 Return: Sun Dec 10 2017 Trip spans 2 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Tue Feb 13 2018 Return: Sun Feb 18 2018 Trip spans 6 days
United
United
ONT
DEN
2h 15m
nonstop
DEN
ONT
2h 22m
nonstop
Depart: Wed Jan 10 2018 Return: Wed Jan 17 2018 Trip spans 8 days
Frontier
Frontier
ONT
DEN
2h 24m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Wed Feb 14 2018 Return: Sun Feb 18 2018 Trip spans 5 days
United
United
ONT
DEN
2h 17m
nonstop
DEN
ONT
2h 22m
nonstop
Depart: Thu Jan 11 2018 Return: Tue Jan 16 2018 Trip spans 6 days
Frontier
Frontier
ONT
DEN
2h 24m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Sat Feb 17 2018 Return: Sun Feb 18 2018 Trip spans 2 days
United
United
ONT
DEN
2h 16m
nonstop
DEN
ONT
2h 22m
nonstop
Depart: Sat Feb 3 2018 Return: Wed Feb 7 2018 Trip spans 5 days
Frontier
Frontier
ONT
DEN
2h 24m
nonstop
DEN
ONT
2h 27m
nonstop
Depart: Sat Feb 17 2018 Return: Sun Feb 18 2018 Trip spans 2 days
United
United
ONT
DEN
2h 16m
nonstop
DEN
ONT
2h 22m
nonstop
Depart: Sat Dec 2 2017 Return: Sun Dec 3 2017 Trip spans 2 days
Frontier
Frontier
ONT
DEN
2h 18m
nonstop
DEN
ONT
2h 29m
nonstop
Depart: Thu Jan 11 2018 Return: Sat Jan 20 2018 Trip spans 10 days
Frontier
Frontier
ONT
DEN
2h 24m
nonstop
DEN
ONT
2h 27m
nonstop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an and someone from our team will get back to you promptly.

Airports
Origin

Ontario
$67
Destination

Denver
$67