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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: Sat Jan 10 2015 Trip spans 5 days
US Airways
US Airways
PHX
3:50a
ONT
5:04a
1h 14m
nonstop
ONT
1:30a
PHX
2:45a
1h 15m
nonstop
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: Mon Jan 12 2015 Return: Tue Jan 13 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: Sat Jan 17 2015 Return: Tue Jan 20 2015 Trip spans 4 days
US Airways
US Airways
OAK
11:05a
ONT
4:11p
5h 06m
1 stop
ONT
7:40a
OAK
1:40p
6h 00m
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: Mon Feb 9 2015 Return: Wed Feb 11 2015 Trip spans 3 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: Sat Mar 28 2015 Return: Sat Apr 4 2015 Trip spans 8 days
Delta
Delta
SLC
5:45p
ONT
7:26p
1h 41m
nonstop
ONT
7:20a
SLC
8:55a
1h 35m
nonstop
Depart: Mon Mar 2 2015 Return: Sat Mar 7 2015 Trip spans 6 days
Delta
Delta
PDX
1:30p
ONT
5:26p
3h 56m
1 stop
ONT
11:30a
PDX
5:36p
6h 06m
1 stop
Depart: Tue Apr 21 2015 Return: Fri Apr 24 2015 Trip spans 4 days
United
United
SMF
1:10p
ONT
4:15p
3h 05m
1 stop
ONT
1:20a
SMF
3:57a
2h 37m
1 stop
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: Tue May 12 2015 Return: Mon May 18 2015 Trip spans 7 days
American Airlines
American Airlines
LGA
1:50p
ONT
10:08p
8h 18m
1 stop
ONT
8:59p
LGA
4:44a
7h 45m
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 19 2015 Return: Thu May 28 2015 Trip spans 10 days
American Airlines
American Airlines
ATL
3:36p
ONT
10:08p
6h 32m
1 stop
ONT
3:40a
ATL
10:01a
6h 21m
1 stop
Depart: Mon May 18 2015 Return: Wed May 20 2015 Trip spans 3 days
American Airlines
American Airlines
OMA
2:55p
ONT
9:08p
6h 13m
1 stop
ONT
2:05a
OMA
7:43a
5h 38m
1 stop
Depart: Wed May 6 2015 Return: Mon May 11 2015 Trip spans 6 days
American Airlines
American Airlines
BWI
1:55a
ONT
8:57a
7h 02m
1 stop
ONT
8:59p
BWI
4:11a
7h 12m
1 stop
Depart: Tue May 26 2015 Return: Wed Jun 3 2015 Trip spans 9 days
United
United
IAD
3:00a
ONT
10:58a
7h 58m
1 stop
ONT
9:15a
IAD
5:45p
8h 30m
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
Change your search
Airports
Origin

Sacramento
$279
Portland
$253
Seattle
$174
Chicago
$341
Oakland
$159
Washington
$375
San Jose
$159
St Louis
$341
New York City
$337
Omaha
$371
San Francisco
$159
Baltimore
$375
Minneapolis
$311
Atlanta
$363
Orlando
$399
Phoenix
$142
Salt Lake City
$230
Denver
$175
Dallas
$305
Boston
$408
Destination

Ontario
$142