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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: Wed Jan 14 2015 Trip spans 7 days
US Airways
US Airways
PHX
3:59p
ONT
5:11p
1h 12m
nonstop
ONT
7:40a
PHX
8:53a
1h 13m
nonstop
Depart: Wed Jan 7 2015 Return: Sun Jan 11 2015 Trip spans 5 days
US Airways
US Airways
OAK
11:05a
ONT
4:11p
5h 06m
1 stop
ONT
1:30a
OAK
6:54a
5h 24m
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 Jan 27 2015 Return: Sat Jan 31 2015 Trip spans 5 days
Alaska Airlines
Alaska Airlines
SEA
3:00a
ONT
5:38a
2h 38m
nonstop
ONT
12:20p
SEA
3:09p
2h 49m
nonstop
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 May 20 2015 Return: Sun May 24 2015 Trip spans 5 days
Delta
Delta
PDX
1:30p
ONT
5:46p
4h 16m
1 stop
ONT
6:05a
PDX
11:56a
5h 51m
1 stop
Depart: Mon Mar 2 2015 Return: Mon Mar 9 2015 Trip spans 7 days
Delta
Delta
HOU
1:35p
ONT
7:26p
5h 51m
1 stop
ONT
12:30p
HOU
5:47p
5h 17m
1 stop
Depart: Fri Jun 5 2015 Return: Wed Jun 10 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: Sat May 30 2015 Return: Sun May 31 2015 Trip spans 2 days
Delta
Delta
DFW
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
2:05a
DFW
8:41a
6h 36m
1 stop
Depart: Thu Jun 11 2015 Return: Tue Jun 16 2015 Trip spans 6 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: Wed May 27 2015 Return: Wed Jun 3 2015 Trip spans 8 days
Delta
Delta
MCI
2:05a
ONT
7:26a
5h 21m
1 stop
ONT
2:05a
MCI
12:45p
10h 40m
2 stops
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: Mon Apr 20 2015 Return: Mon Apr 27 2015 Trip spans 8 days
United
United
STL
3:10p
ONT
9:11p
6h 01m
1 stop
ONT
8:30a
STL
4:05p
7h 35m
1 stop
Depart: Sat May 16 2015 Return: Sat May 23 2015 Trip spans 8 days
United
United
ORD
1:10p
ONT
9:59p
8h 49m
1 stop
ONT
3:05p
ORD
11:02p
7h 57m
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 16 2015 Trip spans 4 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: Tue Jun 30 2015 Return: Fri Jul 10 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: 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: Sun May 24 2015 Return: Mon Jun 1 2015 Trip spans 9 days
Delta
Delta
CLT
4:30a
ONT
4:51p
12h 21m
2 stops
ONT
2:05a
CLT
2:41p
12h 36m
2 stops
Change your search
Airports
Origin

Kansas City
$324
Charlotte
$442
Portland
$253
Seattle
$174
San Antonio
$412
Chicago
$341
Oakland
$159
Washington
$375
San Jose
$159
St Louis
$341
Omaha
$338
San Francisco
$159
Minneapolis
$311
Orlando
$399
Phoenix
$142
Salt Lake City
$296
Denver
$175
Dallas
$305
Houston
$258
Boston
$408
Destination

Ontario
$142