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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: Tue Jan 13 2015 Return: Sat Jan 17 2015 Trip spans 5 days
Delta
Delta
SLC
4:00p
ONT
5:49p
1h 49m
nonstop
ONT
1:15a
SLC
3:02a
1h 47m
nonstop
Depart: Sat Jan 10 2015 Return: Sun Jan 11 2015 Trip spans 2 days
US Airways
US Airways
SFO
1:00a
ONT
6:34a
5h 34m
1 stop
ONT
1:30a
SFO
7:34a
6h 04m
1 stop
Depart: Thu Jan 22 2015 Return: Tue Jan 27 2015 Trip spans 6 days
United
United
DEN
1:00a
ONT
5:35a
4h 35m
1 stop
ONT
12:30a
DEN
5:40a
5h 10m
1 stop
Depart: Fri Jan 23 2015 Return: Sun Jan 25 2015 Trip spans 3 days
US Airways
US Airways
OAK
1:00a
ONT
6:34a
5h 34m
1 stop
ONT
1:30a
OAK
6:54a
5h 24m
1 stop
Depart: Mon Jan 5 2015 Return: Wed Jan 7 2015 Trip spans 3 days
Delta
Delta
SEA
11:22a
ONT
5:35p
6h 13m
1 stop
ONT
5:10a
SEA
9:59a
4h 49m
1 stop
Depart: Mon Apr 13 2015 Return: Mon Apr 20 2015 Trip spans 8 days
American Airlines
American Airlines
PHX
10:50a
ONT
12:01p
1h 11m
nonstop
ONT
12:41p
PHX
1:58p
1h 17m
nonstop
Depart: Tue May 19 2015 Return: Tue May 26 2015 Trip spans 8 days
Alaska Airlines
Alaska Airlines
PDX
1:05a
ONT
5:47a
4h 42m
1 stop
ONT
6:30a
PDX
12:15p
5h 45m
1 stop
Depart: Mon Mar 23 2015 Return: Sun Mar 29 2015 Trip spans 7 days
United
United
SMF
4:45p
ONT
7:59p
3h 14m
1 stop
ONT
1:35a
SMF
4:32a
2h 57m
1 stop
Depart: Wed May 27 2015 Return: Sun May 31 2015 Trip spans 5 days
Delta
Delta
DFW
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
2:05a
DFW
7:20a
5h 15m
1 stop
Depart: Sun Apr 26 2015 Return: Mon Apr 27 2015 Trip spans 2 days
US Airways
US Airways
ORD
4:05p
ONT
9:52p
5h 47m
1 stop
ONT
3:30p
ORD
9:08p
5h 38m
1 stop
Depart: Sat May 9 2015 Return: Thu May 14 2015 Trip spans 6 days
United
United
JFK
8:00a
ONT
7:15p
11h 15m
1 stop
ONT
8:30a
JFK
4:45p
8h 15m
1 stop
Depart: Tue Apr 14 2015 Return: Wed Apr 22 2015 Trip spans 9 days
United
United
PIT
12:25p
ONT
7:23p
6h 58m
1 stop
ONT
9:30a
PIT
3:32p
6h 02m
1 stop
Depart: Sun Apr 19 2015 Return: Tue Apr 28 2015 Trip spans 10 days
United
United
MKE
1:40a
ONT
8:55a
7h 15m
1 stop
ONT
9:30a
MKE
3:20p
5h 50m
1 stop
Depart: Sun Jun 7 2015 Return: Thu Jun 11 2015 Trip spans 5 days
US Airways
US Airways
MSP
7:30a
ONT
2:01p
6h 31m
1 stop
ONT
3:30p
MSP
10:56p
7h 26m
1 stop
Depart: Sun May 17 2015 Return: Tue May 19 2015 Trip spans 3 days
American Airlines
American Airlines
OMA
2:55p
ONT
9:08p
6h 13m
1 stop
ONT
8:59p
OMA
2:54a
5h 55m
1 stop
Depart: Sun Jun 21 2015 Return: Tue Jun 23 2015 Trip spans 3 days
American Airlines
American Airlines
DTW
2:00a
ONT
8:57a
6h 57m
1 stop
ONT
5:50p
DTW
11:28p
5h 38m
1 stop
Change your search
Airports
Origin

Milwaukee
$391
Detroit
$525
Sacramento
$243
Portland
$231
Seattle
$185
Chicago
$333
Oakland
$159
New York City
$388
Omaha
$405
San Francisco
$159
Minneapolis
$397
Phoenix
$210
Salt Lake City
$154
Denver
$159
Dallas
$305
Pittsburgh
$391
Destination

Ontario
$154