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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: Thu Jan 8 2015 Return: Fri Jan 9 2015 Trip spans 2 days
US Airways
US Airways
PHX
3:59p
ONT
5:11p
1h 12m
nonstop
ONT
2:25p
PHX
3:36p
1h 11m
nonstop
Depart: Wed Jan 7 2015 Return: Sat Jan 10 2015 Trip spans 4 days
US Airways
US Airways
OAK
7:29a
ONT
1:46p
6h 17m
1 stop
ONT
11:40a
OAK
5:08p
5h 28m
1 stop
Depart: Sat Jan 17 2015 Return: Sun Jan 18 2015 Trip spans 2 days
US Airways
US Airways
SJC
11:10a
ONT
4:11p
5h 01m
1 stop
ONT
1:30a
SJC
6:53a
5h 23m
1 stop
Depart: Wed Jan 21 2015 Return: Tue Feb 24 2015 Trip spans 35 days
US Airways
US Airways
SFO
12:05p
ONT
4:11p
4h 06m
1 stop
ONT
11:40a
SFO
5:23p
5h 43m
1 stop
Depart: Wed Jan 28 2015 Return: Sat Jan 31 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
SEA
3:00a
ONT
5:38a
2h 38m
nonstop
ONT
12:20p
SEA
3:09p
2h 49m
nonstop
Depart: Wed Feb 4 2015 Return: Tue Feb 10 2015 Trip spans 7 days
US Airways
US Airways
DEN
3:05a
ONT
7:34a
4h 29m
1 stop
ONT
7:40a
DEN
11:39a
3h 59m
1 stop
Depart: Sun Jun 28 2015 Return: Sat Jul 18 2015 Trip spans 21 days
Multiple Airlines
Multiple Airlines
PDX
4:15p
ONT
6:26p
2h 11m
nonstop
ONT
2:00a
PDX
4:23a
2h 23m
nonstop
Depart: Mon Mar 16 2015 Return: Sat Mar 21 2015 Trip spans 6 days
Delta
Delta
SLC
4:40a
ONT
6:26a
1h 46m
nonstop
ONT
6:20a
SLC
7:55a
1h 35m
nonstop
Depart: Sun Feb 22 2015 Return: Wed Feb 25 2015 Trip spans 4 days
US Airways
US Airways
MSP
12:20a
ONT
6:04a
5h 44m
1 stop
ONT
7:40a
MSP
12:57p
5h 17m
1 stop
Depart: Fri Dec 26 2014 Return: Sat Jan 31 2015 Trip spans 37 days
United
United
SMF
10:07a
ONT
2:38p
4h 31m
1 stop
ONT
7:30a
SMF
11:32a
4h 02m
1 stop
Depart: Tue Mar 31 2015 Return: Tue Apr 7 2015 Trip spans 8 days
United
United
OMA
1:30p
ONT
6:27p
4h 57m
1 stop
ONT
9:30a
OMA
4:31p
7h 01m
1 stop
Depart: Mon Apr 13 2015 Return: Mon May 18 2015 Trip spans 36 days
Delta
Delta
DFW
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
2:05a
DFW
8:41a
6h 36m
1 stop
Depart: Sat May 16 2015 Return: Wed May 27 2015 Trip spans 12 days
American Airlines
American Airlines
MCI
2:10a
ONT
7:57a
5h 47m
1 stop
ONT
3:40a
MCI
9:10a
5h 30m
1 stop
Depart: Sat Apr 18 2015 Return: Wed Apr 22 2015 Trip spans 5 days
United
United
ATL
2:45a
ONT
9:55a
7h 10m
1 stop
ONT
7:35a
ATL
3:12p
7h 37m
1 stop
Depart: Mon Apr 27 2015 Return: Tue Apr 28 2015 Trip spans 2 days
United
United
EWR
2:30a
ONT
12:28p
9h 58m
1 stop
ONT
7:35a
EWR
4:38p
9h 03m
1 stop
Depart: Fri May 29 2015 Return: Sat May 30 2015 Trip spans 2 days
United
United
JFK
8:00a
ONT
5:33p
9h 33m
1 stop
ONT
1:20a
JFK
10:17a
8h 57m
1 stop
Depart: Wed May 27 2015 Return: Wed Jun 3 2015 Trip spans 8 days
United
United
FLL
4:00a
ONT
3:03p
11h 03m
1 stop
ONT
4:45p
FLL
12:15a
7h 30m
1 stop
Depart: Tue Apr 28 2015 Return: Tue May 5 2015 Trip spans 8 days
Delta
Delta
IND
9:35a
ONT
9:26p
11h 51m
2 stops
ONT
2:05a
IND
3:05p
13h 00m
2 stops
Depart: Wed May 13 2015 Return: Sat May 16 2015 Trip spans 4 days
United
United
RDU
2:20a
ONT
9:55a
7h 35m
1 stop
ONT
5:34a
RDU
4:10p
10h 36m
1 stop
Depart: Tue Jun 23 2015 Return: Tue Jun 30 2015 Trip spans 8 days
US Airways
US Airways
BOS
3:15p
ONT
10:52p
7h 37m
1 stop
ONT
5:50p
BOS
12:51a
7h 01m
1 stop
Change your search
Airports
Origin

Kansas City
$317
Sacramento
$280
Portland
$218
Seattle
$174
Raleigh
$376
Fort Lauderdale
$339
Oakland
$159
San Jose
$159
New York City
$336
Omaha
$305
San Francisco
$159
Minneapolis
$279
Atlanta
$324
Phoenix
$142
Salt Lake City
$230
Newark
$336
Denver
$175
Dallas
$305
Boston
$408
Indianapolis
$360
Destination

Ontario
$142