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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 Mar 14 2015 Return: Sat Mar 28 2015 Trip spans 15 days
American Airlines
American Airlines
SJC
3:10p
ONT
7:56p
4h 46m
1 stop
ONT
2:30a
SJC
7:53a
5h 23m
1 stop
Depart: Sat Mar 7 2015 Return: Mon Mar 9 2015 Trip spans 2 days
American Airlines
American Airlines
PHX
3:50a
ONT
5:06a
1h 16m
nonstop
ONT
3:25p
PHX
4:33p
1h 08m
nonstop
Depart: Sun Apr 26 2015 Return: Wed May 6 2015 Trip spans 11 days
Delta
Delta
SLC
4:37a
ONT
6:28a
1h 51m
nonstop
ONT
6:20a
SLC
7:55a
1h 35m
nonstop
Depart: Sun Apr 12 2015 Return: Wed Apr 22 2015 Trip spans 11 days
Delta
Delta
DEN
2:10a
ONT
6:28a
4h 18m
1 stop
ONT
6:05a
DEN
10:19a
4h 14m
1 stop
Depart: Tue May 19 2015 Return: Wed May 27 2015 Trip spans 9 days
Delta
Delta
SEA
1:05p
ONT
5:46p
4h 41m
1 stop
ONT
1:30p
SEA
6:55p
5h 25m
1 stop
Depart: Thu May 21 2015 Return: Sun May 24 2015 Trip spans 4 days
United
United
SFO
6:45p
ONT
8:10p
1h 25m
nonstop
ONT
1:30a
SFO
3:01a
1h 31m
nonstop
Depart: Mon May 18 2015 Return: Tue May 19 2015 Trip spans 2 days
Alaska Airlines
Alaska Airlines
PDX
4:30p
ONT
6:37p
2h 07m
nonstop
ONT
2:30a
PDX
4:49a
2h 19m
nonstop
Depart: Wed Jul 8 2015 Return: Sat Jul 11 2015 Trip spans 4 days
United
United
SMF
10:45a
ONT
2:33p
3h 48m
1 stop
ONT
1:20a
SMF
3:57a
2h 37m
1 stop
Depart: Tue Jul 7 2015 Return: Wed Jul 15 2015 Trip spans 9 days
American Airlines
American Airlines
DFW
2:15a
ONT
9:31a
7h 16m
1 stop
ONT
12:41p
DFW
5:12p
4h 31m
1 stop
Depart: Mon Jul 27 2015 Return: Tue Aug 4 2015 Trip spans 9 days
American Airlines
American Airlines
MCI
5:15p
ONT
9:52p
4h 37m
1 stop
ONT
12:41p
MCI
5:34p
4h 53m
1 stop
Depart: Tue Aug 18 2015 Return: Wed Aug 26 2015 Trip spans 9 days
United
United
BWI
2:30a
ONT
10:58a
8h 28m
1 stop
ONT
9:15a
BWI
3:37p
6h 22m
1 stop
Depart: Sun Jul 12 2015 Return: Sun Jul 19 2015 Trip spans 8 days
American Airlines
American Airlines
AUS
5:40p
ONT
9:52p
4h 12m
1 stop
ONT
3:30p
AUS
7:53p
4h 23m
1 stop
Depart: Sun Aug 16 2015 Return: Sun Aug 30 2015 Trip spans 15 days
American Airlines
American Airlines
ORD
1:00a
ONT
7:03a
6h 03m
1 stop
ONT
3:30p
ORD
9:08p
5h 38m
1 stop
Change your search
Airports
Origin

Kansas City
$391
Sacramento
$265
Portland
$210
Seattle
$181
Chicago
$439
Austin
$411
San Jose
$159
San Francisco
$206
Baltimore
$397
Phoenix
$164
Salt Lake City
$172
Denver
$181
Dallas
$285
Destination

Ontario
$159