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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 6 2015 Return: Wed Jan 7 2015 Trip spans 2 days
US Airways
US Airways
PHX
1:10p
ONT
2:21p
1h 11m
nonstop
ONT
7:40a
PHX
8:53a
1h 13m
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 10 2015 Return: Sun Jan 11 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: Sun Jan 11 2015 Return: Wed Jan 14 2015 Trip spans 4 days
US Airways
US Airways
SFO
12:05p
ONT
4:11p
4h 06m
1 stop
ONT
1:30a
SFO
7:34a
6h 04m
1 stop
Depart: Tue Feb 10 2015 Return: Sat Feb 14 2015 Trip spans 5 days
US Airways
US Airways
DEN
12:45a
ONT
5:04a
4h 19m
1 stop
ONT
7:40a
DEN
11:39a
3h 59m
1 stop
Depart: Wed Jan 28 2015 Return: Sun Feb 1 2015 Trip spans 5 days
Delta
Delta
SEA
12:15p
ONT
4:49p
4h 34m
1 stop
ONT
1:15a
SEA
7:29a
6h 14m
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: Thu Feb 26 2015 Return: Sat Feb 28 2015 Trip spans 3 days
Delta
Delta
SLC
3:40a
ONT
5:26a
1h 46m
nonstop
ONT
5:20a
SLC
6:55a
1h 35m
nonstop
Depart: Tue Mar 31 2015 Return: Wed Apr 1 2015 Trip spans 2 days
United
United
MCI
1:25p
ONT
6:27p
5h 02m
1 stop
ONT
9:05a
MCI
2:20p
5h 15m
1 stop
Depart: Mon Apr 20 2015 Return: Tue Apr 28 2015 Trip spans 9 days
United
United
ATL
2:25p
ONT
10:59p
8h 34m
1 stop
ONT
7:35a
ATL
3:12p
7h 37m
1 stop
Depart: Sun Apr 26 2015 Return: Tue Apr 28 2015 Trip spans 3 days
American Airlines
American Airlines
OMA
2:10a
ONT
7:57a
5h 47m
1 stop
ONT
10:15a
OMA
4:51p
6h 36m
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: Sun May 10 2015 Return: Tue Jul 7 2015 Trip spans 59 days
American Airlines
American Airlines
DFW
6:07p
ONT
9:08p
3h 01m
nonstop
ONT
8:59p
DFW
11:53p
2h 54m
nonstop
Depart: Sun May 31 2015 Return: Wed Jun 3 2015 Trip spans 4 days
United
United
ORD
6:35a
ONT
2:48p
8h 13m
1 stop
ONT
4:45p
ORD
12:43a
7h 58m
1 stop
Depart: Tue May 26 2015 Return: Wed Jun 3 2015 Trip spans 9 days
United
United
IAD
11:50a
ONT
10:59p
11h 09m
1 stop
ONT
8:30a
IAD
6:02p
9h 32m
1 stop
Depart: Sat Jun 13 2015 Return: Tue Jun 23 2015 Trip spans 11 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
Depart: Tue May 5 2015 Return: Thu May 7 2015 Trip spans 3 days
US Airways
US Airways
MSP
2:00p
ONT
7:05p
5h 05m
1 stop
ONT
8:59p
MSP
3:33a
6h 34m
1 stop
Depart: Wed Jun 10 2015 Return: Tue Jun 16 2015 Trip spans 7 days
US Airways
US Airways
IND
2:00a
ONT
8:03a
6h 03m
1 stop
ONT
12:41p
IND
6:07p
5h 26m
1 stop
Depart: Mon May 25 2015 Return: Fri May 29 2015 Trip spans 5 days
Delta
Delta
SAT
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
2:05a
SAT
7:36a
5h 31m
1 stop
Depart: Sat May 16 2015 Return: Mon May 25 2015 Trip spans 10 days
United
United
JFK
10:45a
ONT
10:59p
12h 14m
2 stops
ONT
3:05p
JFK
11:47p
8h 42m
1 stop
Change your search
Airports
Origin

Kansas City
$317
Portland
$218
Seattle
$183
San Antonio
$412
Chicago
$357
Fort Lauderdale
$339
Oakland
$159
Washington
$375
San Jose
$159
New York City
$419
Omaha
$338
San Francisco
$159
Minneapolis
$395
Atlanta
$326
Phoenix
$142
Salt Lake City
$230
Denver
$175
Dallas
$351
Boston
$375
Indianapolis
$397
Destination

Ontario
$142