Find Deals on 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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Book cheap flights to Ontario

(Round-trip)
Depart: Tue May 31 2016 Return: Sat Jun 4 2016 Trip spans 5 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 29m
nonstop
Depart: Sat Jun 4 2016 Return: Sat Jun 11 2016 Trip spans 8 days
Major Airline
Major Airline
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 24m
nonstop
Depart: Wed Oct 26 2016 Return: Wed Nov 2 2016 Trip spans 8 days
Southwest
Southwest
OAK
ONT
1h 15m
nonstop
ONT
OAK
1h 15m
nonstop
Depart: Sun May 22 2016 Return: Sat May 28 2016 Trip spans 7 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 17m
nonstop
ONT
PDX
2h 19m
nonstop
Depart: Sat May 28 2016 Return: Mon Jun 6 2016 Trip spans 10 days
Delta
Delta
SLC
ONT
1h 51m
nonstop
ONT
SLC
1h 47m
nonstop
Depart: Sat Oct 22 2016 Return: Wed Oct 26 2016 Trip spans 5 days
American Airlines
American Airlines
PHX
ONT
1h 11m
nonstop
ONT
PHX
1h 17m
nonstop
Depart: Wed Jun 1 2016 Return: Sat Jun 4 2016 Trip spans 4 days
United
United
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 29m
nonstop
Depart: Tue Sep 20 2016 Return: Sat Sep 24 2016 Trip spans 5 days
Major Airline
Major Airline
SFO
ONT
1h 27m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Sat Oct 8 2016 Return: Tue Oct 11 2016 Trip spans 4 days
United
United
SFO
ONT
1h 27m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Thu Jun 2 2016 Return: Thu Jun 9 2016 Trip spans 8 days
Southwest
Southwest
OAK
ONT
1h 15m
nonstop
ONT
OAK
1h 10m
nonstop
Depart: Tue May 17 2016 Return: Thu May 19 2016 Trip spans 3 days
Major Airline
Major Airline
SFO
ONT
1h 26m
nonstop
ONT
SFO
1h 29m
nonstop
Depart: Sat Sep 3 2016 Return: Sat Sep 10 2016 Trip spans 8 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 16m
nonstop
ONT
PDX
2h 11m
nonstop
Depart: Tue Aug 30 2016 Return: Wed Sep 7 2016 Trip spans 9 days
Southwest
Southwest
OAK
ONT
1h 15m
nonstop
ONT
OAK
1h 10m
nonstop
Depart: Wed Aug 24 2016 Return: Mon Aug 29 2016 Trip spans 6 days
United
United
SFO
ONT
1h 13m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Mon Jun 6 2016 Return: Tue Jun 7 2016 Trip spans 2 days
Delta
Delta
SLC
ONT
1h 47m
nonstop
ONT
SLC
1h 47m
nonstop
Depart: Wed Sep 14 2016 Return: Thu Sep 15 2016 Trip spans 2 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 16m
nonstop
ONT
PDX
2h 11m
nonstop
Depart: Sat Sep 17 2016 Return: Sat Sep 24 2016 Trip spans 8 days
Southwest
Southwest
OAK
ONT
1h 10m
nonstop
ONT
OAK
1h 10m
nonstop
Depart: Thu Sep 1 2016 Return: Tue Sep 13 2016 Trip spans 13 days
United
United
SFO
ONT
1h 27m
nonstop
ONT
SFO
1h 18m
nonstop
Depart: Fri May 20 2016 Return: Tue May 24 2016 Trip spans 5 days
Major Airline
Major Airline
PDX
ONT
2h 17m
nonstop
ONT
PDX
2h 19m
nonstop
Depart: Mon May 23 2016 Return: Tue May 24 2016 Trip spans 2 days
Alaska Airlines
Alaska Airlines
SEA
ONT
2h 25m
nonstop
ONT
SEA
2h 35m
nonstop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We make every attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller
At KAYAK we don’t set prices, so it’s not possible for us to guarantee what other companies are selling.

We aggregate tons 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 don'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.

More questions or if you have a bad price to report to us
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Airports
Origin

San Francisco
$135
Portland
$162
Seattle
$172
Phoenix
$209
Salt Lake City
$177
Oakland
$147
Destination

Ontario
$135