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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
6h 17m
1 stop
ONT
SMF
5h 53m
1 stop
Depart: Wed Jun 24 2015 Return: Tue Jun 30 2015 Trip spans 7 days
United
United
SFO
ONT
1h 31m
nonstop
ONT
SFO
1h 27m
nonstop
Depart: Sat Sep 12 2015 Return: Sat Sep 19 2015 Trip spans 8 days
Alaska Airlines
Alaska Airlines
SEA
ONT
2h 30m
nonstop
ONT
SEA
2h 25m
nonstop
Depart: Wed Jun 3 2015 Return: Sun Jun 7 2015 Trip spans 5 days
US Airways
US Airways
PHX
ONT
1h 17m
nonstop
ONT
PHX
1h 14m
nonstop
Depart: Wed Jul 1 2015 Return: Mon Jul 13 2015 Trip spans 13 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 14m
nonstop
ONT
PDX
2h 07m
nonstop
Depart: Sun Nov 1 2015 Return: Mon Nov 9 2015 Trip spans 9 days
United
United
DEN
ONT
4h 38m
1 stop
ONT
DEN
5h 09m
1 stop
Depart: Tue Sep 22 2015 Return: Tue Sep 29 2015 Trip spans 8 days
US Airways
US Airways
SJC
ONT
5h 17m
1 stop
ONT
SJC
5h 14m
1 stop
Depart: Sat Oct 10 2015 Return: Tue Oct 13 2015 Trip spans 4 days
Delta
Delta
SLC
ONT
1h 41m
nonstop
ONT
SLC
1h 41m
nonstop
Depart: Fri Oct 2 2015 Return: Sun Oct 4 2015 Trip spans 3 days
US Airways
US Airways
DFW
ONT
7h 16m
1 stop
ONT
DFW
4h 30m
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: Tue Jul 28 2015 Return: Tue Aug 11 2015 Trip spans 15 days
US Airways
US Airways
HOU
ONT
5h 26m
1 stop
ONT
HOU
4h 57m
1 stop
Depart: Wed Aug 12 2015 Return: Tue Aug 18 2015 Trip spans 7 days
United
United
ORD
ONT
9h 29m
1 stop
ONT
ORD
5h 49m
1 stop
Depart: Fri Sep 11 2015 Return: Mon Sep 14 2015 Trip spans 4 days
United
United
FLL
ONT
7h 25m
1 stop
ONT
FLL
8h 00m
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: Tue Aug 25 2015 Return: Sat Aug 29 2015 Trip spans 5 days
American Airlines
American Airlines
CMH
ONT
6h 15m
1 stop
ONT
CMH
5h 54m
1 stop
Depart: Wed Oct 21 2015 Return: Sat Oct 24 2015 Trip spans 4 days
Delta
Delta
MCI
ONT
5h 21m
1 stop
ONT
MCI
5h 03m
1 stop
Depart: Tue Sep 8 2015 Return: Tue Sep 15 2015 Trip spans 8 days
United
United
PIT
ONT
8h 43m
1 stop
ONT
PIT
6h 39m
1 stop
Depart: Thu Nov 19 2015 Return: Thu Nov 26 2015 Trip spans 8 days
Delta
Delta
BOS
ONT
7h 46m
1 stop
ONT
BOS
7h 12m
1 stop
Depart: Sat Oct 24 2015 Return: Fri Oct 30 2015 Trip spans 7 days
Delta
Delta
MKE
ONT
10h 51m
2 stops
ONT
MKE
8h 31m
2 stops
Airports
Origin

Milwaukee
$354
Kansas City
$345
Sacramento
$153
Portland
$206
Seattle
$174
Chicago
only $333
only $344
Fort Lauderdale
$341
Austin
$311
San Jose
$227
San Francisco
$164
Minneapolis
$317
Columbus
$345
Phoenix
$186
Salt Lake City
$256
Denver
$224
Dallas
$285
Houston
$333
Boston
$353
Pittsburgh
$349
Destination

Ontario
$153