Find Cheap Flights from Ontario to United States

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 United States

(Round-trip)
Depart: Tue Aug 22 2017 Return: Thu Aug 24 2017 Trip spans 3 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Fri Oct 27 2017 Return: Wed Nov 1 2017 Trip spans 6 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 22m
nonstop
PDX
ONT
2h 22m
nonstop
Depart: Sat Aug 26 2017 Return: Sat Sep 2 2017 Trip spans 8 days
Delta
Delta
ONT
SLC
1h 44m
nonstop
SLC
ONT
1h 47m
nonstop
Depart: Sat Sep 16 2017 Return: Tue Sep 19 2017 Trip spans 4 days
American Airlines
American Airlines
ONT
DFW
3h 00m
nonstop
DFW
ONT
3h 08m
nonstop
Depart: Sat Aug 26 2017 Return: Mon Aug 28 2017 Trip spans 3 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Sat Sep 2 2017 Return: Mon Sep 4 2017 Trip spans 3 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Wed Oct 4 2017 Return: Mon Oct 16 2017 Trip spans 13 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Sat Oct 7 2017 Return: Wed Oct 11 2017 Trip spans 5 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Sat Oct 21 2017 Return: Mon Oct 23 2017 Trip spans 3 days
United
United
ONT
SFO
1h 30m
nonstop
SFO
ONT
1h 29m
nonstop
Depart: Tue Oct 31 2017 Return: Tue Nov 7 2017 Trip spans 8 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 23m
nonstop
PDX
ONT
2h 18m
nonstop
Depart: Thu Nov 23 2017 Return: Tue Nov 28 2017 Trip spans 6 days
United
United
ONT
SFO
1h 18m
nonstop
SFO
ONT
1h 18m
nonstop
Depart: Wed Nov 1 2017 Return: Sun Nov 5 2017 Trip spans 5 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 23m
nonstop
PDX
ONT
2h 18m
nonstop
Depart: Sat Sep 2 2017 Return: Tue Sep 5 2017 Trip spans 4 days
Delta
Delta
ONT
SLC
1h 44m
nonstop
SLC
ONT
1h 49m
nonstop
Depart: Mon Dec 11 2017 Return: Sat Dec 16 2017 Trip spans 6 days
United
United
ONT
SFO
1h 18m
nonstop
SFO
ONT
1h 18m
nonstop
Depart: Fri Oct 20 2017 Return: Tue Oct 24 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
DFW
2h 56m
nonstop
DFW
ONT
3h 03m
nonstop
Depart: Thu Sep 28 2017 Return: Mon Oct 2 2017 Trip spans 5 days
Delta
Delta
ONT
SLC
1h 46m
nonstop
SLC
ONT
1h 44m
nonstop
Depart: Wed Nov 29 2017 Return: Sat Dec 2 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 31m
nonstop
PDX
ONT
2h 18m
nonstop
Depart: Tue Oct 24 2017 Return: Sat Oct 28 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
DFW
3h 00m
nonstop
DFW
ONT
3h 08m
nonstop
Depart: Thu Oct 26 2017 Return: Mon Oct 30 2017 Trip spans 5 days
Delta
Delta
ONT
SLC
1h 47m
nonstop
SLC
ONT
1h 44m
nonstop
Depart: Fri Dec 1 2017 Return: Sat Dec 2 2017 Trip spans 2 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 31m
nonstop
PDX
ONT
2h 18m
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
$149
Salt Lake City
$167
Dallas
$175