Find Deals on International Flights from 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 Ontario to worldwide

(Round-trip)
Depart: Mon May 15 2017 Return: Wed May 17 2017 Trip spans 3 days
Major Airline
Major Airline
ONT
SFO
5h 33m
nonstop
SFO
ONT
5h 16m
nonstop
Depart: Wed May 17 2017 Return: Sun May 21 2017 Trip spans 5 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 26m
nonstop
Depart: Tue Apr 25 2017 Return: Tue May 2 2017 Trip spans 8 days
American Airlines
American Airlines
ONT
SEA
7h 31m
1 stop
SEA
ONT
7h 16m
1 stop
Depart: Sat Jun 3 2017 Return: Mon Jun 5 2017 Trip spans 3 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 18m
nonstop
PDX
ONT
2h 20m
nonstop
Depart: Thu Aug 24 2017 Return: Sun Sep 10 2017 Trip spans 18 days
Aeromexico
Aeromexico
ONT
GDL
3h 13m
nonstop
GDL
ONT
3h 18m
nonstop
Depart: Fri Sep 22 2017 Return: Sun Oct 1 2017 Trip spans 10 days
Volaris
Volaris
ONT
GDL
3h 11m
nonstop
GDL
ONT
3h 10m
nonstop
Depart: Fri May 19 2017 Return: Mon May 22 2017 Trip spans 4 days
Major Airline
Major Airline
ONT
PDX
5h 21m
2 stops
PDX
ONT
7h 45m
2 stops
Depart: Thu Jul 27 2017 Return: Sat Aug 12 2017 Trip spans 17 days
Delta
Delta
ONT
GDL
3h 13m
nonstop
GDL
ONT
3h 02m
nonstop
Depart: Thu May 18 2017 Return: Sun May 21 2017 Trip spans 4 days
Major Airline
Major Airline
ONT
SFO
5h 36m
nonstop
SFO
ONT
4h 40m
nonstop
Depart: Fri Oct 20 2017 Return: Mon Oct 23 2017 Trip spans 4 days
United
United
ONT
SFO
1h 18m
nonstop
SFO
ONT
1h 14m
nonstop
Depart: Fri Jun 2 2017 Return: Sat Jun 3 2017 Trip spans 2 days
Major Airline
Major Airline
ONT
SFO
5h 42m
nonstop
SFO
ONT
16h 26m
nonstop
Depart: Tue Jul 11 2017 Return: Thu Jul 13 2017 Trip spans 3 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 18m
nonstop
PDX
ONT
2h 20m
nonstop
Depart: Wed Jun 7 2017 Return: Mon Jun 12 2017 Trip spans 6 days
Major Airline
Major Airline
ONT
SFO
9h 15m
nonstop
SFO
ONT
11h 00m
nonstop
Depart: Sat Jul 29 2017 Return: Sat Aug 5 2017 Trip spans 8 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 18m
nonstop
PDX
ONT
2h 15m
nonstop
Depart: Fri Aug 25 2017 Return: Thu Sep 7 2017 Trip spans 14 days
Aeromexico
Aeromexico
ONT
GDL
3h 13m
nonstop
GDL
ONT
3h 18m
nonstop
Depart: Mon Jul 10 2017 Return: Fri Jul 14 2017 Trip spans 5 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Tue Jul 18 2017 Return: Mon Jul 24 2017 Trip spans 7 days
Major Airline
Major Airline
ONT
SFO
8h 47m
nonstop
SFO
ONT
5h 53m
nonstop
Depart: Fri Jun 23 2017 Return: Sun Jul 2 2017 Trip spans 10 days
American Airlines
American Airlines
ONT
GDL
26h 18m
1 stop
GDL
ONT
19h 57m
1 stop
Depart: Sat Aug 5 2017 Return: Tue Aug 8 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 18m
nonstop
PDX
ONT
2h 15m
nonstop
Depart: Sat May 20 2017 Return: Mon May 22 2017 Trip spans 3 days
Volaris
Volaris
ONT
GDL
3h 20m
nonstop
GDL
ONT
3h 31m
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 email and someone from our team will get back to you promptly.

Airports
Origin

Ontario
$97
Destination

San Francisco
$97
Portland
$131
Seattle
$160
Guadalajara
$221