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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: Sat Feb 14 2015 Return: Tue Feb 17 2015 Trip spans 4 days
American Airlines
American Airlines
PHX
6:15a
ONT
7:34a
1h 19m
nonstop
ONT
11:40a
PHX
12:55p
1h 15m
nonstop
Depart: Tue Feb 17 2015 Return: Tue Feb 24 2015 Trip spans 8 days
American Airlines
American Airlines
SFO
10:50a
ONT
4:11p
5h 21m
1 stop
ONT
11:40a
SFO
5:23p
5h 43m
1 stop
Depart: Fri Mar 6 2015 Return: Sat Mar 7 2015 Trip spans 2 days
Delta
Delta
SLC
4:53p
ONT
6:34p
1h 41m
nonstop
ONT
1:15a
SLC
2:55a
1h 40m
nonstop
Depart: Mon Apr 27 2015 Return: Tue Apr 28 2015 Trip spans 2 days
US Airways
US Airways
OAK
12:15p
ONT
5:06p
4h 51m
1 stop
ONT
2:30a
OAK
7:47a
5h 17m
1 stop
Depart: Tue Apr 7 2015 Return: Mon Apr 13 2015 Trip spans 7 days
US Airways
US Airways
DEN
1:45a
ONT
6:07a
4h 22m
1 stop
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
Depart: Sat Feb 7 2015 Return: Sat Feb 14 2015 Trip spans 8 days
Delta
Delta
SEA
11:25a
ONT
4:43p
5h 18m
1 stop
ONT
1:10a
SEA
7:15a
6h 05m
1 stop
Depart: Sun Mar 8 2015 Return: Wed Mar 11 2015 Trip spans 4 days
Delta
Delta
PDX
2:00p
ONT
6:34p
4h 34m
1 stop
ONT
2:15a
PDX
8:15a
6h 00m
1 stop
Depart: Mon Feb 2 2015 Return: Sat Feb 7 2015 Trip spans 6 days
United
United
SMF
11:08a
ONT
2:30p
3h 22m
1 stop
ONT
12:30a
SMF
4:19a
3h 49m
1 stop
Depart: Sun Jun 7 2015 Return: Sat Jun 13 2015 Trip spans 7 days
American Airlines
American Airlines
DFW
6:07p
ONT
9:08p
3h 01m
nonstop
ONT
8:59p
DFW
11:53p
2h 54m
nonstop
Depart: Thu Aug 27 2015 Return: Sun Aug 30 2015 Trip spans 4 days
United
United
ORD
9:00a
ONT
4:33p
7h 33m
1 stop
ONT
4:45p
ORD
12:43a
7h 58m
1 stop
Depart: Mon Jul 27 2015 Return: Wed Aug 5 2015 Trip spans 10 days
Delta
Delta
HOU
2:35p
ONT
8:26p
5h 51m
1 stop
ONT
6:20a
HOU
11:49a
5h 29m
1 stop
Depart: Tue Aug 25 2015 Return: Tue Sep 1 2015 Trip spans 8 days
United
United
MCO
2:45a
ONT
9:55a
7h 10m
1 stop
ONT
7:35a
MCO
3:28p
7h 53m
1 stop
Depart: Sun Aug 23 2015 Return: Wed Aug 26 2015 Trip spans 4 days
United
United
JFK
2:00a
ONT
10:58a
8h 58m
1 stop
ONT
1:20p
JFK
11:47p
10h 27m
1 stop
Change your search
Airports
Origin

New York
$455
Sacramento
$284
Portland
$191
Seattle
$183
Chicago
$373
Oakland
$167
San Francisco
$159
Orlando
$450
Phoenix
$142
Salt Lake City
$164
Denver
$179
Dallas
$336
Houston
$418
Destination

Ontario
$142