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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 Jan 7 2015 Return: Sun Jan 11 2015 Trip spans 5 days
US Airways
US Airways
PHX
6:15a
ONT
7:34a
1h 19m
nonstop
ONT
2:25p
PHX
3:36p
1h 11m
nonstop
Depart: Sat Jan 31 2015 Return: Wed Feb 4 2015 Trip spans 5 days
United
United
DEN
3:00a
ONT
8:00a
5h 00m
1 stop
ONT
8:15a
DEN
10:28a
2h 13m
nonstop
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
5:10a
SLC
6:56a
1h 46m
nonstop
Depart: Sun Jan 11 2015 Return: Tue Jan 13 2015 Trip spans 3 days
US Airways
US Airways
SFO
12:05p
ONT
4:11p
4h 06m
1 stop
ONT
7:40a
SFO
2:04p
6h 24m
1 stop
Depart: Fri Feb 6 2015 Return: Sun Feb 8 2015 Trip spans 3 days
US Airways
US Airways
OAK
7:29a
ONT
1:46p
6h 17m
1 stop
ONT
1:30a
OAK
6:54a
5h 24m
1 stop
Depart: Tue Jan 6 2015 Return: Wed Jan 14 2015 Trip spans 9 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 14 2015 Return: Wed Jun 17 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
PDX
4:15p
ONT
6:26p
2h 11m
nonstop
ONT
2:00a
PDX
4:23a
2h 23m
nonstop
Depart: Sun Feb 22 2015 Return: Tue Feb 24 2015 Trip spans 3 days
US Airways
US Airways
MSP
12:20a
ONT
6:04a
5h 44m
1 stop
ONT
11:40a
MSP
4:56p
5h 16m
1 stop
Depart: Sun May 31 2015 Return: Tue Jun 9 2015 Trip spans 10 days
United
United
SMF
2:00a
ONT
5:01a
3h 01m
1 stop
ONT
1:20a
SMF
3:57a
2h 37m
1 stop
Depart: Sat May 9 2015 Return: Tue May 12 2015 Trip spans 4 days
American Airlines
American Airlines
AUS
4:09p
ONT
9:08p
4h 59m
1 stop
ONT
10:15a
AUS
5:06p
6h 51m
1 stop
Depart: Sat May 2 2015 Return: Sat May 16 2015 Trip spans 15 days
Delta
Delta
DFW
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
2:05a
DFW
7:20a
5h 15m
1 stop
Depart: Tue Apr 28 2015 Return: Tue May 5 2015 Trip spans 8 days
American Airlines
American Airlines
ATL
10:50a
ONT
6:50p
8h 00m
1 stop
ONT
3:40a
ATL
10:01a
6h 21m
1 stop
Depart: Thu Jun 4 2015 Return: Tue Jun 9 2015 Trip spans 6 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: Sun May 3 2015 Return: Tue May 5 2015 Trip spans 3 days
United
United
BOS
2:05a
ONT
12:28p
10h 23m
1 stop
ONT
1:20a
BOS
9:38a
8h 18m
1 stop
Depart: Mon Apr 27 2015 Return: Wed May 6 2015 Trip spans 10 days
US Airways
US Airways
IND
2:00a
ONT
8:03a
6h 03m
1 stop
ONT
6:42a
IND
2:53p
8h 11m
1 stop
Depart: Mon May 18 2015 Return: Sun May 24 2015 Trip spans 7 days
Delta
Delta
BWI
12:45p
ONT
9:26p
8h 41m
1 stop
ONT
6:05a
BWI
3:58p
9h 53m
1 stop
Depart: Tue Jun 30 2015 Return: Wed Jul 8 2015 Trip spans 9 days
US Airways
US Airways
MCO
4:45p
ONT
10:52p
6h 07m
1 stop
ONT
3:30p
MCO
10:07p
6h 37m
1 stop
Depart: Sun May 17 2015 Return: Tue May 19 2015 Trip spans 3 days
US Airways
US Airways
MCI
5:15p
ONT
9:52p
4h 37m
1 stop
ONT
6:00a
MCI
11:11a
5h 11m
1 stop
Depart: Sat Jun 27 2015 Return: Sat Jul 4 2015 Trip spans 8 days
American Airlines
American Airlines
SAT
2:30a
ONT
7:03a
4h 33m
1 stop
ONT
6:00a
SAT
10:43a
4h 43m
1 stop
Depart: Fri Jun 26 2015 Return: Tue Jun 30 2015 Trip spans 5 days
United
United
EWR
8:50a
ONT
5:33p
8h 43m
1 stop
ONT
3:05p
EWR
1:15a
10h 10m
1 stop
Change your search
Airports
Origin

Kansas City
$440
Sacramento
$275
Portland
$218
Seattle
$183
San Antonio
$451
Chicago
$337
Austin
$287
Oakland
$159
San Francisco
$159
Baltimore
$397
Minneapolis
$247
Atlanta
$327
Orlando
$399
Phoenix
$142
Salt Lake City
$154
Newark
$532
Denver
$151
Dallas
$305
Boston
$370
Indianapolis
$388
Destination

Ontario
$142