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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: Mon Jan 12 2015 Return: Tue Jan 13 2015 Trip spans 2 days
US Airways
US Airways
SFO
10:50a
ONT
4:11p
5h 21m
1 stop
ONT
1:30a
SFO
7:34a
6h 04m
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: Thu Mar 5 2015 Return: Tue Mar 10 2015 Trip spans 5 days
Delta
Delta
SLC
4:45p
ONT
6:26p
1h 41m
nonstop
ONT
12:30p
SLC
2:11p
1h 41m
nonstop
Depart: Sat Jun 6 2015 Return: Tue Jun 16 2015 Trip spans 11 days
US Airways
US Airways
MSP
4:55p
ONT
9:52p
4h 57m
1 stop
ONT
5:50p
MSP
10:56p
5h 06m
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: Wed May 13 2015 Return: Tue May 19 2015 Trip spans 7 days
American Airlines
American Airlines
MCI
2:10a
ONT
7:57a
5h 47m
1 stop
ONT
6:42a
MCI
11:58a
5h 16m
1 stop
Depart: Sat Apr 25 2015 Return: Wed May 6 2015 Trip spans 12 days
American Airlines
American Airlines
ATL
12:24p
ONT
6:50p
6h 26m
1 stop
ONT
8:59p
ATL
3:36a
6h 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: Tue May 26 2015 Return: Thu Jun 4 2015 Trip spans 10 days
United
United
RDU
2:40p
ONT
10:59p
8h 19m
1 stop
ONT
7:35a
RDU
4:05p
8h 30m
1 stop
Depart: Mon Jun 1 2015 Return: Sat Jun 6 2015 Trip spans 6 days
Multiple Airlines
Multiple Airlines
OMA
4:15a
ONT
9:31a
5h 16m
1 stop
ONT
6:20a
OMA
10:53a
4h 33m
1 stop
Depart: Sun Apr 19 2015 Return: Fri Apr 24 2015 Trip spans 6 days
Delta
Delta
SAT
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
6:20a
SAT
5:35p
11h 15m
2 stops
Depart: Tue Jun 9 2015 Return: Sat Jun 13 2015 Trip spans 5 days
United
United
MCO
3:00a
ONT
10:58a
7h 58m
1 stop
ONT
9:15a
MCO
4:08p
6h 53m
1 stop
Depart: Sun Mar 29 2015 Return: Mon Mar 30 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
Change your search
Airports
Origin

Kansas City
$317
Portland
$218
Seattle
$174
Raleigh
$376
San Antonio
$390
Chicago
$401
Fort Lauderdale
$339
Oakland
$159
New York City
$336
Omaha
$384
San Francisco
$159
Minneapolis
$289
Atlanta
$327
Orlando
$399
Phoenix
$142
Salt Lake City
$230
Newark
$336
Denver
$175
Dallas
$305
Indianapolis
$360
Destination

Ontario
$142