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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 Mar 24 2015 Return: Sat Mar 28 2015 Trip spans 5 days
Delta
Delta
SLC
5:53p
ONT
7:34p
1h 41m
nonstop
ONT
2:15a
SLC
3:55a
1h 40m
nonstop
Depart: Wed Apr 15 2015 Return: Wed Apr 22 2015 Trip spans 8 days
American Airlines
American Airlines
SJC
12:15p
ONT
5:06p
4h 51m
1 stop
ONT
2:30a
SJC
7:45a
5h 15m
1 stop
Depart: Sat Apr 25 2015 Return: Sat May 2 2015 Trip spans 8 days
American Airlines
American Airlines
SFO
2:00a
ONT
7:33a
5h 33m
1 stop
ONT
6:00a
SFO
12:02p
6h 02m
1 stop
Depart: Tue Apr 21 2015 Return: Wed Apr 22 2015 Trip spans 2 days
Alaska Airlines
Alaska Airlines
PDX
2:35a
ONT
4:47a
2h 12m
nonstop
ONT
2:30a
PDX
4:48a
2h 18m
nonstop
Depart: Sun Mar 29 2015 Return: Tue Apr 7 2015 Trip spans 10 days
Delta
Delta
DEN
2:10a
ONT
6:30a
4h 20m
1 stop
ONT
2:15a
DEN
6:11a
3h 56m
1 stop
Depart: Fri Apr 17 2015 Return: Sun Apr 19 2015 Trip spans 3 days
American Airlines
American Airlines
PHX
3:50a
ONT
5:07a
1h 17m
nonstop
ONT
2:30a
PHX
3:43a
1h 13m
nonstop
Depart: Mon Mar 23 2015 Return: Tue Mar 24 2015 Trip spans 2 days
Delta
Delta
SEA
2:10p
ONT
6:34p
4h 24m
1 stop
ONT
2:15a
SEA
8:02a
5h 47m
1 stop
Depart: Tue Sep 15 2015 Return: Sun Sep 20 2015 Trip spans 6 days
United
United
SMF
10:45a
ONT
2:33p
3h 48m
1 stop
ONT
1:20a
SMF
3:57a
2h 37m
1 stop
Depart: Mon Jul 13 2015 Return: Wed Jul 15 2015 Trip spans 3 days
US Airways
US Airways
DFW
2:15a
ONT
9:31a
7h 16m
1 stop
ONT
12:41p
DFW
5:11p
4h 30m
1 stop
Depart: Fri Sep 11 2015 Return: Mon Sep 14 2015 Trip spans 4 days
United
United
ORD
10:15a
ONT
6:15p
8h 00m
1 stop
ONT
11:10a
ORD
6:34p
7h 24m
1 stop
Depart: Wed Sep 9 2015 Return: Mon Sep 14 2015 Trip spans 6 days
Delta
Delta
JFK
8:50a
ONT
4:39p
7h 49m
1 stop
ONT
2:15p
JFK
11:09p
8h 54m
1 stop
Depart: Tue Sep 29 2015 Return: Sat Oct 3 2015 Trip spans 5 days
United
United
IND
2:10a
ONT
9:55a
7h 45m
1 stop
ONT
3:00a
IND
9:10a
6h 10m
1 stop
Depart: Sat Jul 18 2015 Return: Wed Jul 22 2015 Trip spans 5 days
US Airways
US Airways
MCI
5:15p
ONT
9:52p
4h 37m
1 stop
ONT
2:28a
MCI
7:41a
5h 13m
1 stop
Depart: Sat Sep 12 2015 Return: Sat Sep 19 2015 Trip spans 8 days
United
United
MCO
8:55a
ONT
6:10p
9h 15m
1 stop
ONT
7:35a
MCO
3:28p
7h 53m
1 stop
Depart: Sun Jul 12 2015 Return: Sun Jul 26 2015 Trip spans 15 days
Multiple Airlines
Multiple Airlines
OAK
2:00a
ONT
7:31a
5h 31m
1 stop
ONT
6:25a
OAK
8:05a
25h 40m
1 stop
Depart: Wed Aug 19 2015 Return: Mon Aug 24 2015 Trip spans 6 days
Delta
Delta
HOU
2:35p
ONT
8:26p
5h 51m
1 stop
ONT
6:20a
HOU
11:49a
5h 29m
1 stop
Depart: Mon Aug 31 2015 Return: Tue Sep 1 2015 Trip spans 2 days
United
United
MKE
1:40a
ONT
8:55a
7h 15m
1 stop
ONT
9:15a
MKE
3:20p
6h 05m
1 stop
Depart: Mon Sep 21 2015 Return: Sun Sep 27 2015 Trip spans 7 days
American Airlines
American Airlines
CLE
3:00p
ONT
10:08p
7h 08m
1 stop
ONT
8:59p
CLE
3:39a
6h 40m
1 stop
Depart: Tue Aug 11 2015 Return: Wed Aug 19 2015 Trip spans 9 days
American Airlines
American Airlines
DTW
1:40p
ONT
8:05p
6h 25m
1 stop
ONT
12:41p
DTW
6:35p
5h 54m
1 stop
Depart: Mon Aug 24 2015 Return: Sat Aug 29 2015 Trip spans 6 days
Multiple Airlines
Multiple Airlines
LGA
1:45a
ONT
9:55a
8h 10m
1 stop
ONT
8:59p
LGA
6:21a
9h 22m
1 stop
Airports
Origin

Milwaukee
$425
New York
only $336
only $478
Kansas City
$391
Detroit
$463
Sacramento
$278
Portland
$174
Seattle
$183
Chicago
$321
Oakland
$408
Cleveland
$431
San Jose
$159
San Francisco
$170
Orlando
$396
Phoenix
$182
Salt Lake City
$154
Denver
$181
Dallas
$305
Houston
$408
Indianapolis
$378
Destination

Ontario
$154