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.
Compare vs. KAYAK all | none
Browse Origins:
Browse Destinations:

Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights to Ontario

(Round-trip)
Depart: Wed Apr 5 2017 Return: Mon Apr 10 2017 Trip spans 6 days
Major Airline
Major Airline
SFO
ONT
7h 10m
nonstop
ONT
SFO
5h 41m
nonstop
Depart: Wed Apr 12 2017 Return: Wed Apr 26 2017 Trip spans 15 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 30m
nonstop
Depart: Tue May 2 2017 Return: Wed May 3 2017 Trip spans 2 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 21m
nonstop
ONT
PDX
2h 20m
nonstop
Depart: Sat Apr 15 2017 Return: Tue May 16 2017 Trip spans 32 days
Delta
Delta
SLC
ONT
1h 47m
nonstop
ONT
SLC
1h 46m
nonstop
Depart: Wed Aug 30 2017 Return: Sat Sep 2 2017 Trip spans 4 days
American Airlines
American Airlines
DFW
ONT
3h 01m
nonstop
ONT
DFW
3h 02m
nonstop
Depart: Fri May 5 2017 Return: Tue May 9 2017 Trip spans 5 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 30m
nonstop
Depart: Fri May 12 2017 Return: Tue May 16 2017 Trip spans 5 days
Major Airline
Major Airline
SFO
ONT
8h 30m
nonstop
ONT
SFO
8h 01m
nonstop
Depart: Wed May 10 2017 Return: Tue May 16 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 23m
nonstop
ONT
PDX
2h 18m
nonstop
Depart: Sat Apr 15 2017 Return: Thu Apr 20 2017 Trip spans 6 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 30m
nonstop
Depart: Wed May 3 2017 Return: Wed May 10 2017 Trip spans 8 days
Delta
Delta
SLC
ONT
1h 51m
nonstop
ONT
SLC
1h 46m
nonstop
Depart: Mon Aug 21 2017 Return: Tue Aug 22 2017 Trip spans 2 days
Major Airline
Major Airline
SFO
ONT
9h 35m
nonstop
ONT
SFO
9h 30m
nonstop
Depart: Thu Jun 8 2017 Return: Tue Jun 13 2017 Trip spans 6 days
United
United
SFO
ONT
1h 14m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Wed May 10 2017 Return: Sat May 13 2017 Trip spans 4 days
Delta
Delta
SLC
ONT
1h 51m
nonstop
ONT
SLC
1h 48m
nonstop
Depart: Sat Aug 26 2017 Return: Thu Aug 31 2017 Trip spans 6 days
United
United
SFO
ONT
1h 18m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Tue Apr 18 2017 Return: Fri Apr 21 2017 Trip spans 4 days
Major Airline
Major Airline
PDX
ONT
2h 15m
nonstop
ONT
PDX
2h 20m
nonstop
Depart: Sun Jul 2 2017 Return: Sat Jul 8 2017 Trip spans 7 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 20m
nonstop
ONT
PDX
2h 14m
nonstop
Depart: Tue May 16 2017 Return: Sat May 20 2017 Trip spans 5 days
Delta
Delta
SLC
ONT
1h 47m
nonstop
ONT
SLC
1h 48m
nonstop
Depart: Sat Sep 16 2017 Return: Wed Sep 20 2017 Trip spans 5 days
American Airlines
American Airlines
DFW
ONT
3h 01m
nonstop
ONT
DFW
3h 04m
nonstop
Depart: Thu Sep 28 2017 Return: Tue Oct 3 2017 Trip spans 6 days
United
United
SFO
ONT
1h 18m
nonstop
ONT
SFO
1h 23m
nonstop
Depart: Tue Jun 6 2017 Return: Tue Jun 13 2017 Trip spans 8 days
Delta
Delta
SLC
ONT
1h 51m
nonstop
ONT
SLC
1h 47m
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

San Francisco
$79
Portland
$133
Salt Lake City
$149
Dallas
$183
Destination

Ontario
$79
Airlines Airline reviews

75 travelers who booked a flight from San Francisco to Ontario rated their chosen airlines with an average of 7.5.

Overall
7.7
Boarding
7.6
Crew
8.0
Comfort
7.5
Food
7.0
Entertainment
6.8