Find Deals on International Flights to Ontario

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 worldwide to Ontario

(Round-trip)
Depart: Tue Aug 29 2017 Return: Mon Sep 4 2017 Trip spans 7 days
United
United
DEN
ONT
2h 19m
nonstop
ONT
DEN
2h 17m
nonstop
Depart: Tue Oct 3 2017 Return: Sat Oct 7 2017 Trip spans 5 days
American Airlines
American Airlines
DEN
ONT
4h 26m
1 stop
ONT
DEN
4h 17m
1 stop
Depart: Fri Dec 1 2017 Return: Tue Dec 5 2017 Trip spans 5 days
Delta
Delta
DEN
ONT
4h 14m
1 stop
ONT
DEN
5h 25m
1 stop
Depart: Sat Oct 28 2017 Return: Tue Oct 31 2017 Trip spans 4 days
Multiple Airlines
Multiple Airlines
BWI
ONT
7h 11m
1 stop
ONT
BWI
9h 53m
1 stop
Depart: Sat Sep 2 2017 Return: Mon Sep 4 2017 Trip spans 3 days
United
United
DEN
ONT
2h 20m
nonstop
ONT
DEN
2h 17m
nonstop
Depart: Tue Oct 17 2017 Return: Sat Oct 21 2017 Trip spans 5 days
American Airlines
American Airlines
DEN
ONT
4h 43m
1 stop
ONT
DEN
4h 11m
1 stop
Depart: Sat Dec 9 2017 Return: Tue Dec 12 2017 Trip spans 4 days
United
United
DEN
ONT
2h 18m
nonstop
ONT
DEN
2h 05m
nonstop
Depart: Wed Aug 23 2017 Return: Sat Aug 26 2017 Trip spans 4 days
United
United
DEN
ONT
4h 59m
1 stop
ONT
DEN
2h 17m
nonstop
Depart: Tue Aug 15 2017 Return: Tue Aug 22 2017 Trip spans 8 days
United
United
DEN
ONT
2h 20m
nonstop
ONT
DEN
2h 17m
nonstop
Depart: Sat Jul 29 2017 Return: Tue Aug 1 2017 Trip spans 4 days
American Airlines
American Airlines
DFW
ONT
2h 59m
nonstop
ONT
DFW
2h 57m
nonstop
Depart: Mon Jan 22 2018 Return: Wed Jan 31 2018 Trip spans 10 days
British Airways
British Airways
CDG
ONT
20h 23m
2 stops
ONT
CDG
21h 38m
2 stops
Depart: Tue Oct 3 2017 Return: Sun Oct 8 2017 Trip spans 6 days
United
United
DEN
ONT
5h 34m
1 stop
ONT
DEN
2h 17m
nonstop
Depart: Tue Aug 29 2017 Return: Sat Sep 9 2017 Trip spans 12 days
Multiple Airlines
Multiple Airlines
BWI
ONT
7h 43m
1 stop
ONT
BWI
6h 26m
1 stop
Depart: Sat Nov 11 2017 Return: Tue Nov 14 2017 Trip spans 4 days
Delta
Delta
BWI
ONT
7h 18m
1 stop
ONT
BWI
6h 55m
1 stop
Depart: Tue Oct 10 2017 Return: Tue Oct 17 2017 Trip spans 8 days
American Airlines
American Airlines
ATL
ONT
6h 27m
1 stop
ONT
ATL
6h 26m
1 stop
Depart: Sun Sep 3 2017 Return: Wed Sep 6 2017 Trip spans 4 days
Multiple Airlines
Multiple Airlines
BWI
ONT
7h 27m
1 stop
ONT
BWI
8h 43m
1 stop
Depart: Fri Nov 24 2017 Return: Sat Dec 2 2017 Trip spans 9 days
United
United
DEN
ONT
2h 18m
nonstop
ONT
DEN
2h 11m
nonstop
Depart: Tue Aug 29 2017 Return: Tue Sep 12 2017 Trip spans 15 days
Multiple Airlines
Multiple Airlines
BDL
ONT
8h 42m
1 stop
ONT
BDL
9h 04m
1 stop
Depart: Wed Sep 20 2017 Return: Tue Sep 26 2017 Trip spans 7 days
American Airlines
American Airlines
BWI
ONT
7h 20m
1 stop
ONT
BWI
7h 25m
1 stop
Depart: Fri Dec 1 2017 Return: Thu Jan 4 2018 Trip spans 35 days
Delta
Delta
BOS
ONT
7h 59m
1 stop
ONT
BOS
7h 45m
1 stop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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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.

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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.

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Airports
Origin

Baltimore
$300
Atlanta
$280
Hartford
$318
Denver
$187
Dallas
$240
Paris
$603
Boston
$381
Destination

Ontario
$187
Airlines Airline reviews

17 travelers who booked a flight from Denver to Ontario rated their chosen airlines with an average of 6.8.

Overall
7.2
Boarding
6.9
Crew
7.5
Comfort
7.2
Food
6.1
Entertainment
6.0