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
Students
under 26
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: Sat Jan 21 2017 Return: Tue Jan 24 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 13m
nonstop
ONT
PDX
2h 22m
nonstop
Depart: Thu Feb 2 2017 Return: Tue Feb 7 2017 Trip spans 6 days
Major Airline
Major Airline
PDX
ONT
12h 58m
1 stop
ONT
PDX
8h 15m
1 stop
Depart: Tue Dec 27 2016 Return: Sat Dec 31 2016 Trip spans 5 days
United
United
SFO
ONT
1h 24m
nonstop
ONT
SFO
1h 32m
nonstop
Depart: Wed Jan 11 2017 Return: Wed Jan 18 2017 Trip spans 8 days
American Airlines
American Airlines
ORD
ONT
6h 00m
1 stop
ONT
ORD
5h 44m
1 stop
Depart: Sat Feb 4 2017 Return: Tue Feb 7 2017 Trip spans 4 days
Delta
Delta
DFW
ONT
8h 14m
1 stop
ONT
DFW
5h 30m
1 stop
Depart: Thu Mar 2 2017 Return: Tue Mar 7 2017 Trip spans 6 days
Major Airline
Major Airline
PDX
ONT
5h 54m
1 stop
ONT
PDX
4h 28m
1 stop
Depart: Sat Mar 4 2017 Return: Tue Mar 7 2017 Trip spans 4 days
Southwest
Southwest
DFW
ONT
3h 20m
nonstop
ONT
DFW
3h 00m
nonstop
Depart: Thu Jan 26 2017 Return: Sun Jan 29 2017 Trip spans 4 days
United
United
PDX
ONT
6h 13m
1 stop
ONT
PDX
5h 38m
1 stop
Depart: Sun Jan 22 2017 Return: Sat Jan 28 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 13m
nonstop
ONT
PDX
2h 22m
nonstop
Depart: Sat Dec 24 2016 Return: Tue Dec 27 2016 Trip spans 4 days
Major Airline
Major Airline
SFO
ONT
12h 00m
nonstop
ONT
SFO
5h 36m
nonstop
Depart: Sat Jan 14 2017 Return: Tue Jan 24 2017 Trip spans 11 days
United
United
SFO
ONT
1h 24m
nonstop
ONT
SFO
1h 29m
nonstop
Depart: Sun Dec 25 2016 Return: Thu Dec 29 2016 Trip spans 5 days
Major Airline
Major Airline
SFO
ONT
7h 10m
nonstop
ONT
SFO
6h 15m
nonstop
Depart: Sat Feb 18 2017 Return: Tue Feb 21 2017 Trip spans 4 days
United
United
SFO
ONT
1h 28m
nonstop
ONT
SFO
1h 32m
nonstop
Depart: Wed Jan 25 2017 Return: Tue Jan 31 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
SEA
ONT
2h 29m
nonstop
ONT
SEA
2h 37m
nonstop
Depart: Wed Jan 18 2017 Return: Tue Jan 24 2017 Trip spans 7 days
Major Airline
Major Airline
SEA
ONT
2h 29m
nonstop
ONT
SEA
2h 37m
nonstop
Depart: Sat Apr 1 2017 Return: Tue Apr 4 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 13m
nonstop
ONT
PDX
2h 19m
nonstop
Depart: Wed Feb 1 2017 Return: Sat Feb 4 2017 Trip spans 4 days
American Airlines
American Airlines
ORD
ONT
6h 54m
1 stop
ONT
ORD
6h 47m
1 stop
Depart: Sat Jan 21 2017 Return: Thu Jan 26 2017 Trip spans 6 days
Major Airline
Major Airline
SEA
ONT
2h 29m
nonstop
ONT
SEA
2h 37m
nonstop
Depart: Tue Dec 27 2016 Return: Sat Dec 31 2016 Trip spans 5 days
United
United
SFO
ONT
1h 24m
nonstop
ONT
SFO
1h 32m
nonstop
Depart: Wed May 10 2017 Return: Sat May 13 2017 Trip spans 4 days
American Airlines
American Airlines
ORD
ONT
6h 27m
1 stop
ONT
ORD
6h 15m
1 stop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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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.

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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,
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Airports
Origin

San Francisco
$117
Portland
$109
Seattle
$137
Chicago
$194
Dallas
$224
Destination

Ontario
$109
Airlines Airline reviews

54 travelers who booked a flight from Portland to Ontario rated their chosen airlines with an average of 7.4.

Overall
7.6
Boarding
7.6
Crew
7.9
Comfort
7.4
Food
6.8
Entertainment
6.6