Find Cheap 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 to Ontario

(Round-trip)
Depart: Sat May 20 2017 Return: Tue May 23 2017 Trip spans 4 days
Major Airline
Major Airline
SFO
ONT
13h 48m
nonstop
ONT
SFO
9h 10m
nonstop
Depart: Sat Jun 3 2017 Return: Sat Jun 10 2017 Trip spans 8 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 30m
nonstop
Depart: Sat May 20 2017 Return: Tue May 23 2017 Trip spans 4 days
Delta
Delta
SLC
ONT
1h 48m
nonstop
ONT
SLC
1h 48m
nonstop
Depart: Sat Jun 10 2017 Return: Tue Jun 13 2017 Trip spans 4 days
American Airlines
American Airlines
PHX
ONT
1h 20m
nonstop
ONT
PHX
1h 15m
nonstop
Depart: Tue Jun 6 2017 Return: Sat Jun 10 2017 Trip spans 5 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 20m
nonstop
ONT
PDX
2h 18m
nonstop
Depart: Tue Oct 10 2017 Return: Sat Oct 14 2017 Trip spans 5 days
United
United
SFO
ONT
1h 14m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Tue May 23 2017 Return: Sat May 27 2017 Trip spans 5 days
Major Airline
Major Airline
SFO
ONT
4h 40m
nonstop
ONT
SFO
5h 42m
nonstop
Depart: Thu Jun 1 2017 Return: Tue Jun 6 2017 Trip spans 6 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 30m
nonstop
Depart: Thu Aug 24 2017 Return: Sat Aug 26 2017 Trip spans 3 days
Major Airline
Major Airline
SFO
ONT
11h 45m
nonstop
ONT
SFO
9h 37m
nonstop
Depart: Tue Jun 6 2017 Return: Sat Jun 10 2017 Trip spans 5 days
Delta
Delta
SLC
ONT
1h 47m
nonstop
ONT
SLC
1h 44m
nonstop
Depart: Mon Aug 28 2017 Return: Wed Aug 30 2017 Trip spans 3 days
United
United
SFO
ONT
1h 14m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Wed Jun 7 2017 Return: Sat Jun 10 2017 Trip spans 4 days
Delta
Delta
SLC
ONT
1h 51m
nonstop
ONT
SLC
1h 44m
nonstop
Depart: Tue Sep 5 2017 Return: Thu Sep 7 2017 Trip spans 3 days
United
United
SFO
ONT
1h 18m
nonstop
ONT
SFO
1h 23m
nonstop
Depart: Sun Aug 20 2017 Return: Sat Sep 9 2017 Trip spans 21 days
American Airlines
American Airlines
PHX
ONT
1h 09m
nonstop
ONT
PHX
1h 14m
nonstop
Depart: Tue Sep 26 2017 Return: Sat Sep 30 2017 Trip spans 5 days
Delta
Delta
SLC
ONT
1h 55m
nonstop
ONT
SLC
1h 47m
nonstop
Depart: Wed Aug 23 2017 Return: Sun Aug 27 2017 Trip spans 5 days
American Airlines
American Airlines
PHX
ONT
1h 19m
nonstop
ONT
PHX
1h 16m
nonstop
Depart: Thu Jun 1 2017 Return: Mon Jun 5 2017 Trip spans 5 days
Major Airline
Major Airline
SFO
ONT
11h 15m
nonstop
ONT
SFO
5h 57m
nonstop
Depart: Thu Jul 13 2017 Return: Sat Jul 15 2017 Trip spans 3 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 20m
nonstop
ONT
PDX
2h 18m
nonstop
Depart: Mon Jun 5 2017 Return: Thu Jun 8 2017 Trip spans 4 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 30m
nonstop
Depart: Tue Oct 10 2017 Return: Fri Oct 13 2017 Trip spans 4 days
American Airlines
American Airlines
DFW
ONT
3h 01m
nonstop
ONT
DFW
2h 54m
nonstop
* 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,
please send us an email and someone from our team will get back to you promptly.

^ The fares displayed in KAYAK ads found on other sites include all taxes and fees for economy class travel and were found by KAYAK users in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.
Airports
Origin

San Francisco
$117
Portland
$167
Phoenix
$163
Salt Lake City
$149
Dallas
$171
Destination

Ontario
$117
Airlines Airline reviews

89 travelers who booked a flight from San Francisco to Ontario rated their chosen airlines with an average of 7.0.

Overall
7.3
Boarding
7.2
Crew
7.6
Comfort
7.3
Food
6.5
Entertainment
6.4