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Find Flight Deals from United States to Ontario

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

Book cheap flights to Ontario

(Round-trip)
Depart: Wed Aug 19 2015 Return: Sat Aug 22 2015 Trip spans 4 days
American Airlines
American Airlines
SMF
ONT
4h 50m
1 stop
ONT
SMF
5h 12m
1 stop
Depart: Wed Jun 24 2015 Return: Thu Jul 2 2015 Trip spans 9 days
United
United
SFO
ONT
1h 31m
nonstop
ONT
SFO
1h 27m
nonstop
Depart: Sat Oct 17 2015 Return: Sat Oct 31 2015 Trip spans 15 days
Alaska Airlines
Alaska Airlines
SEA
ONT
2h 29m
nonstop
ONT
SEA
2h 34m
nonstop
Depart: Tue Jun 9 2015 Return: Tue Jun 16 2015 Trip spans 8 days
US Airways
US Airways
PHX
ONT
1h 10m
nonstop
ONT
PHX
1h 12m
nonstop
Depart: Wed Aug 5 2015 Return: Tue Aug 11 2015 Trip spans 7 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 19m
nonstop
ONT
PDX
2h 07m
nonstop
Depart: Sat Sep 12 2015 Return: Tue Sep 15 2015 Trip spans 4 days
American Airlines
American Airlines
DEN
ONT
4h 03m
1 stop
ONT
DEN
3h 58m
1 stop
Depart: Thu Sep 10 2015 Return: Mon Sep 14 2015 Trip spans 5 days
Delta
Delta
SLC
ONT
1h 46m
nonstop
ONT
SLC
1h 35m
nonstop
Depart: Sat May 30 2015 Return: Sat Jun 13 2015 Trip spans 15 days
US Airways
US Airways
SJC
ONT
4h 53m
1 stop
ONT
SJC
5h 17m
1 stop
Depart: Mon Aug 31 2015 Return: Thu Sep 10 2015 Trip spans 11 days
United
United
ATL
ONT
7h 28m
1 stop
ONT
ATL
8h 22m
1 stop
Depart: Sat May 23 2015 Return: Sun May 24 2015 Trip spans 2 days
American Airlines
American Airlines
DFW
ONT
5h 07m
1 stop
ONT
DFW
7h 19m
1 stop
Depart: Tue Oct 27 2015 Return: Wed Nov 4 2015 Trip spans 9 days
United
United
AUS
ONT
5h 55m
1 stop
ONT
AUS
5h 03m
1 stop
Depart: Tue Nov 3 2015 Return: Mon Nov 9 2015 Trip spans 7 days
Delta
Delta
MSP
ONT
5h 16m
1 stop
ONT
MSP
5h 20m
1 stop
Depart: Mon Jun 15 2015 Return: Wed Jun 24 2015 Trip spans 10 days
US Airways
US Airways
HOU
ONT
4h 40m
1 stop
ONT
HOU
4h 57m
1 stop
Depart: Thu Oct 15 2015 Return: Tue Oct 20 2015 Trip spans 6 days
American Airlines
American Airlines
SAT
ONT
7h 17m
1 stop
ONT
SAT
4h 31m
1 stop
Depart: Wed Oct 28 2015 Return: Mon Nov 2 2015 Trip spans 6 days
United
United
ORD
ONT
7h 08m
1 stop
ONT
ORD
5h 49m
1 stop
Depart: Tue Aug 25 2015 Return: Tue Sep 1 2015 Trip spans 8 days
American Airlines
American Airlines
FLL
ONT
7h 12m
1 stop
ONT
FLL
7h 02m
1 stop
Depart: Sat Sep 19 2015 Return: Sat Sep 26 2015 Trip spans 8 days
Delta
Delta
MDW
ONT
7h 31m
2 stops
ONT
MDW
13h 27m
2 stops
Depart: Sat Sep 26 2015 Return: Sat Oct 3 2015 Trip spans 8 days
US Airways
US Airways
MCI
ONT
5h 03m
1 stop
ONT
MCI
5h 13m
1 stop
Depart: Thu Jul 9 2015 Return: Sun Jul 12 2015 Trip spans 4 days
US Airways
US Airways
OAK
ONT
5h 21m
1 stop
ONT
OAK
11h 32m
1 stop
Depart: Thu Sep 17 2015 Return: Tue Sep 22 2015 Trip spans 6 days
American Airlines
American Airlines
IAH
ONT
5h 16m
1 stop
ONT
IAH
15h 06m
1 stop
Airports
Origin

Kansas City
$345
Sacramento
$153
Portland
$194
Seattle
$174
San Antonio
$325
Chicago
only $330
only $344
Fort Lauderdale
$337
Austin
$311
Oakland
$347
San Jose
$275
San Francisco
$164
Minneapolis
$317
Atlanta
$281
Phoenix
$186
Salt Lake City
$256
Denver
$199
Dallas
$285
Houston
only $352
only $323
Destination

Ontario
$153