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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: 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: Wed Jan 21 2015 Return: Sat Jan 24 2015 Trip spans 4 days
US Airways
US Airways
SFO
10:50a
ONT
4:11p
5h 21m
1 stop
ONT
11:40a
SFO
5:23p
5h 43m
1 stop
Depart: Mon Jan 19 2015 Return: Fri Jan 23 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: Sat Jan 31 2015 Return: Tue Feb 3 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
SEA
9:15a
ONT
11:45a
2h 30m
nonstop
ONT
12:20p
SEA
3:09p
2h 49m
nonstop
Depart: Tue Apr 14 2015 Return: Sat Apr 18 2015 Trip spans 5 days
Delta
Delta
SLC
5:45p
ONT
7:26p
1h 41m
nonstop
ONT
2:05a
SLC
3:51a
1h 46m
nonstop
Depart: Fri Apr 3 2015 Return: Sun Apr 5 2015 Trip spans 3 days
United
United
SMF
2:00a
ONT
7:10a
5h 10m
1 stop
ONT
1:35a
SMF
4:32a
2h 57m
1 stop
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: Sat May 2 2015 Return: Sun May 3 2015 Trip spans 2 days
Delta
Delta
DFW
10:25a
ONT
6:41p
8h 16m
1 stop
ONT
2:05a
DFW
7:20a
5h 15m
1 stop
Depart: Mon Apr 20 2015 Return: Mon Apr 27 2015 Trip spans 8 days
American Airlines
American Airlines
MCI
10:35a
ONT
5:50p
7h 15m
1 stop
ONT
6:42a
MCI
1:58p
7h 16m
1 stop
Depart: Wed May 13 2015 Return: Wed May 27 2015 Trip spans 15 days
American Airlines
American Airlines
DTW
2:00a
ONT
8:57a
6h 57m
1 stop
ONT
10:15a
DTW
5:01p
6h 46m
1 stop
Depart: Wed Apr 29 2015 Return: Mon May 18 2015 Trip spans 20 days
American Airlines
American Airlines
ORD
4:50a
ONT
11:27a
6h 37m
1 stop
ONT
8:59p
ORD
3:29a
6h 30m
1 stop
Depart: Fri May 1 2015 Return: Fri May 8 2015 Trip spans 8 days
American Airlines
American Airlines
HOU
4:34a
ONT
11:27a
6h 53m
1 stop
ONT
8:59p
HOU
1:54a
4h 55m
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: Tue Jun 2 2015 Return: Sat Jun 6 2015 Trip spans 5 days
United
United
LGA
1:45a
ONT
9:55a
8h 10m
1 stop
ONT
9:15a
LGA
4:04p
6h 49m
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: 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: Tue May 5 2015 Return: Sun May 10 2015 Trip spans 6 days
Delta
Delta
MCO
1:40p
ONT
8:46p
7h 06m
1 stop
ONT
2:05a
MCO
9:22a
7h 17m
1 stop
Depart: Tue Jun 9 2015 Return: Thu Jun 18 2015 Trip spans 10 days
US Airways
US Airways
MSP
2:00p
ONT
7:05p
5h 05m
1 stop
ONT
5:50p
MSP
10:56p
5h 06m
1 stop
Change your search
Airports
Origin

Kansas City
$317
Detroit
$327
Sacramento
$243
Portland
$253
Seattle
$184
Chicago
$333
Washington
$375
San Jose
$159
New York City
$374
San Francisco
$159
Baltimore
$375
Minneapolis
$540
Atlanta
$363
Orlando
$452
Phoenix
$142
Salt Lake City
$230
Denver
$175
Dallas
$305
Houston
$353
Boston
$408
Destination

Ontario
$142