Find Deals on 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
Students
under 26
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: Wed Jan 18 2017 Return: Sat Jan 21 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
PDX
2h 22m
nonstop
PDX
ONT
2h 13m
nonstop
Depart: Fri Jan 27 2017 Return: Tue Jan 31 2017 Trip spans 5 days
Major Airline
Major Airline
ONT
PDX
2h 22m
nonstop
PDX
ONT
2h 13m
nonstop
Depart: Wed Mar 1 2017 Return: Sat Apr 8 2017 Trip spans 38 days
United
United
ONT
SFO
1h 29m
nonstop
SFO
ONT
1h 13m
nonstop
Depart: Sat Dec 24 2016 Return: Sat Dec 31 2016 Trip spans 8 days
American Airlines
American Airlines
ONT
PHX
1h 09m
nonstop
PHX
ONT
1h 22m
nonstop
Depart: Wed Dec 14 2016 Return: Mon Jan 9 2017 Trip spans 27 days
Southwest
Southwest
ONT
PDX
2h 40m
nonstop
PDX
ONT
2h 15m
nonstop
Depart: Wed Dec 14 2016 Return: Thu Dec 29 2016 Trip spans 16 days
Delta
Delta
ONT
SLC
1h 49m
nonstop
SLC
ONT
1h 52m
nonstop
Depart: Tue Feb 28 2017 Return: Tue Mar 7 2017 Trip spans 8 days
Major Airline
Major Airline
ONT
PDX
2h 22m
nonstop
PDX
ONT
2h 13m
nonstop
Depart: Wed Dec 14 2016 Return: Tue Dec 20 2016 Trip spans 7 days
Major Airline
Major Airline
ONT
SFO
8h 53m
nonstop
SFO
ONT
5h 53m
nonstop
Depart: Wed Mar 1 2017 Return: Tue Mar 7 2017 Trip spans 7 days
Major Airline
Major Airline
ONT
PDX
2h 22m
nonstop
PDX
ONT
2h 13m
nonstop
Depart: Wed Dec 21 2016 Return: Wed Dec 28 2016 Trip spans 8 days
United
United
ONT
SFO
1h 33m
nonstop
SFO
ONT
1h 28m
nonstop
Depart: Sun Dec 25 2016 Return: Thu Dec 29 2016 Trip spans 5 days
American Airlines
American Airlines
ONT
PHX
1h 09m
nonstop
PHX
ONT
1h 13m
nonstop
Depart: Thu Jan 19 2017 Return: Sun Jan 22 2017 Trip spans 4 days
Alaska Airlines
Alaska Airlines
ONT
SEA
2h 36m
nonstop
SEA
ONT
2h 29m
nonstop
Depart: Tue Jan 10 2017 Return: Thu Jan 12 2017 Trip spans 3 days
American Airlines
American Airlines
ONT
PHX
1h 16m
nonstop
PHX
ONT
1h 19m
nonstop
Depart: Wed Feb 1 2017 Return: Mon Feb 6 2017 Trip spans 6 days
Alaska Airlines
Alaska Airlines
ONT
SEA
2h 36m
nonstop
SEA
ONT
2h 29m
nonstop
Depart: Fri Feb 10 2017 Return: Fri Feb 17 2017 Trip spans 8 days
United
United
ONT
SFO
1h 29m
nonstop
SFO
ONT
1h 28m
nonstop
Depart: Fri Feb 24 2017 Return: Mon Feb 27 2017 Trip spans 4 days
Major Airline
Major Airline
ONT
SFO
5h 30m
nonstop
SFO
ONT
13h 53m
nonstop
Depart: Tue Dec 13 2016 Return: Thu Dec 15 2016 Trip spans 3 days
Southwest
Southwest
ONT
PHX
1h 10m
nonstop
PHX
ONT
1h 10m
nonstop
Depart: Sat Feb 11 2017 Return: Mon Feb 13 2017 Trip spans 3 days
American Airlines
American Airlines
ONT
PHX
1h 16m
nonstop
PHX
ONT
1h 15m
nonstop
Depart: Thu Dec 29 2016 Return: Wed Jan 4 2017 Trip spans 7 days
Delta
Delta
ONT
SLC
1h 47m
nonstop
SLC
ONT
1h 52m
nonstop
Depart: Fri Dec 16 2016 Return: Sun Dec 18 2016 Trip spans 3 days
Major Airline
Major Airline
ONT
SFO
15h 00m
nonstop
SFO
ONT
13h 50m
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
$109
Destination

San Francisco
$111
Portland
$109
Seattle
$137
Phoenix
$137
Salt Lake City
$167