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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: Thu Jan 8 2015 Return: Fri Jan 9 2015 Trip spans 2 days
US Airways
US Airways
PHX
3:50a
ONT
5:04a
1h 14m
nonstop
ONT
2:25p
PHX
3:36p
1h 11m
nonstop
Depart: Sat Jan 10 2015 Return: Tue Jan 13 2015 Trip spans 4 days
Delta
Delta
SLC
3:55p
ONT
5:43p
1h 48m
nonstop
ONT
12:25p
SLC
2:13p
1h 48m
nonstop
Depart: Fri Jan 9 2015 Return: Sun Jan 11 2015 Trip spans 3 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: Thu Jan 22 2015 Return: Tue Jan 27 2015 Trip spans 6 days
United
United
DEN
1:00a
ONT
5:35a
4h 35m
1 stop
ONT
12:30a
DEN
5:40a
5h 10m
1 stop
Depart: Fri Jan 23 2015 Return: Sun Jan 25 2015 Trip spans 3 days
US Airways
US Airways
OAK
1:00a
ONT
6:34a
5h 34m
1 stop
ONT
1:30a
OAK
6:54a
5h 24m
1 stop
Depart: Mon Jan 5 2015 Return: Tue Jan 6 2015 Trip spans 2 days
Delta
Delta
SEA
11:22a
ONT
5:35p
6h 13m
1 stop
ONT
12:25p
SEA
5:04p
4h 39m
1 stop
Depart: Wed Jun 17 2015 Return: Wed Jun 24 2015 Trip spans 8 days
United
United
PDX
9:15a
ONT
2:33p
5h 18m
1 stop
ONT
3:05p
PDX
6:38p
3h 33m
1 stop
Depart: Tue Apr 7 2015 Return: Tue Apr 14 2015 Trip spans 8 days
Delta
Delta
MSP
1:15p
ONT
8:26p
7h 11m
1 stop
ONT
2:05a
MSP
7:25a
5h 20m
1 stop
Depart: Sun May 31 2015 Return: Tue Jun 9 2015 Trip spans 10 days
United
United
SMF
2:00a
ONT
5:01a
3h 01m
1 stop
ONT
1:20a
SMF
3:57a
2h 37m
1 stop
Depart: Thu Apr 30 2015 Return: Sun May 3 2015 Trip spans 4 days
Delta
Delta
DFW
2:00a
ONT
7:26a
5h 26m
1 stop
ONT
2:05a
DFW
8:41a
6h 36m
1 stop
Depart: Tue Apr 28 2015 Return: Sun May 3 2015 Trip spans 6 days
United
United
ORD
8:15a
ONT
6:15p
10h 00m
1 stop
ONT
4:45p
ORD
12:43a
7h 58m
1 stop
Depart: Wed Apr 29 2015 Return: Tue May 5 2015 Trip spans 7 days
American Airlines
American Airlines
AUS
1:05a
ONT
7:57a
6h 52m
1 stop
ONT
10:15a
AUS
3:24p
5h 09m
1 stop
Depart: Mon Apr 27 2015 Return: Sat May 2 2015 Trip spans 6 days
American Airlines
American Airlines
MCI
2:00a
ONT
7:03a
5h 03m
1 stop
ONT
3:40a
MCI
9:10a
5h 30m
1 stop
Depart: Tue Apr 21 2015 Return: Tue May 5 2015 Trip spans 15 days
American Airlines
American Airlines
PHL
1:15a
ONT
8:57a
7h 42m
1 stop
ONT
10:15a
PHL
5:25p
7h 10m
1 stop
Depart: Sat May 9 2015 Return: Thu May 14 2015 Trip spans 6 days
United
United
JFK
8:00a
ONT
7:15p
11h 15m
1 stop
ONT
8:30a
JFK
4:45p
8h 15m
1 stop
Depart: Sun Apr 19 2015 Return: Tue Apr 28 2015 Trip spans 10 days
United
United
MKE
1:40a
ONT
8:55a
7h 15m
1 stop
ONT
9:30a
MKE
3:20p
5h 50m
1 stop
Depart: Sun May 17 2015 Return: Tue May 19 2015 Trip spans 3 days
American Airlines
American Airlines
OMA
2:55p
ONT
9:08p
6h 13m
1 stop
ONT
8:59p
OMA
2:54a
5h 55m
1 stop
Depart: Sun Jun 21 2015 Return: Tue Jun 23 2015 Trip spans 3 days
American Airlines
American Airlines
DTW
2:00a
ONT
8:57a
6h 57m
1 stop
ONT
5:50p
DTW
11:28p
5h 38m
1 stop
Depart: Fri Jun 26 2015 Return: Tue Jun 30 2015 Trip spans 5 days
United
United
EWR
8:50a
ONT
5:33p
8h 43m
1 stop
ONT
3:05p
EWR
1:15a
10h 10m
1 stop
Change your search
Airports
Origin

Milwaukee
$391
Kansas City
$371
Detroit
$525
Sacramento
$275
Portland
$231
Seattle
$185
Chicago
$333
Austin
$351
Oakland
$159
New York City
$388
Omaha
$405
San Francisco
$159
Minneapolis
$247
Phoenix
$142
Salt Lake City
$154
Newark
$532
Denver
$159
Dallas
$305
Philadelphia
$373
Destination

Ontario
$142