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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
12:10p
ONT
5:11p
5h 01m
1 stop
ONT
2:30a
SJC
7:53a
5h 23m
1 stop
Depart: Sat Mar 28 2015 Return: Sat Apr 4 2015 Trip spans 8 days
American Airlines
American Airlines
SFO
1:05p
ONT
5:11p
4h 06m
1 stop
ONT
2:30a
SFO
8:32a
6h 02m
1 stop
Depart: Thu Apr 2 2015 Return: Fri Apr 3 2015 Trip spans 2 days
Multiple Airlines
Multiple Airlines
PHX
3:55p
ONT
5:06p
1h 11m
nonstop
ONT
6:00a
PHX
7:10a
1h 10m
nonstop
Depart: Sat Apr 18 2015 Return: Sun Apr 19 2015 Trip spans 2 days
Delta
Delta
SLC
6:00p
ONT
7:45p
1h 45m
nonstop
ONT
2:15a
SLC
4:05a
1h 50m
nonstop
Depart: Tue Mar 24 2015 Return: Sat Apr 4 2015 Trip spans 12 days
Delta
Delta
DEN
3:05p
ONT
7:34p
4h 29m
1 stop
ONT
2:10a
DEN
7:26a
5h 16m
1 stop
Depart: Tue Mar 10 2015 Return: Wed Mar 18 2015 Trip spans 9 days
Delta
Delta
SEA
2:10p
ONT
6:34p
4h 24m
1 stop
ONT
2:15a
SEA
8:02a
5h 47m
1 stop
Depart: Mon May 11 2015 Return: Thu May 14 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
PDX
2:35a
ONT
4:50a
2h 15m
nonstop
ONT
3:45p
PDX
6:02p
2h 17m
nonstop
Depart: Sat Mar 7 2015 Return: Sat Mar 21 2015 Trip spans 14 days
United
United
SMF
7:05a
ONT
12:10p
5h 05m
1 stop
ONT
1:35a
SMF
4:32a
2h 57m
1 stop
Depart: Tue Mar 3 2015 Return: Wed Mar 18 2015 Trip spans 15 days
American Airlines
American Airlines
DFW
1:00a
ONT
8:34a
7h 34m
1 stop
ONT
2:00a
DFW
4:59a
2h 59m
nonstop
Depart: Sat Sep 12 2015 Return: Sat Sep 19 2015 Trip spans 8 days
United
United
ORD
3:00a
ONT
12:38p
9h 38m
1 stop
ONT
1:20a
ORD
9:19a
7h 59m
1 stop
Depart: Mon Aug 24 2015 Return: Tue Sep 8 2015 Trip spans 16 days
Multiple Airlines
Multiple Airlines
MCI
2:00a
ONT
7:03a
5h 03m
1 stop
ONT
2:05a
MCI
7:08a
5h 03m
1 stop
Depart: Sat Sep 5 2015 Return: Sun Sep 6 2015 Trip spans 2 days
United
United
AUS
3:00a
ONT
8:55a
5h 55m
1 stop
ONT
3:00a
AUS
7:55a
4h 55m
1 stop
Depart: Fri Sep 11 2015 Return: Sun Sep 13 2015 Trip spans 3 days
United
United
JFK
2:00a
ONT
10:58a
8h 58m
1 stop
ONT
8:30a
JFK
5:52p
9h 22m
1 stop
Depart: Thu Sep 24 2015 Return: Sun Sep 27 2015 Trip spans 4 days
United
United
LGA
1:45a
ONT
9:55a
8h 10m
1 stop
ONT
1:20a
LGA
1:10p
11h 50m
2 stops
Depart: Tue Aug 11 2015 Return: Mon Aug 17 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: Sat Aug 8 2015 Return: Tue Aug 11 2015 Trip spans 4 days
American Airlines
American Airlines
HOU
5:10p
ONT
9:52p
4h 42m
1 stop
ONT
12:41p
HOU
5:34p
4h 53m
1 stop
Depart: Sun Aug 16 2015 Return: Sat Aug 22 2015 Trip spans 7 days
American Airlines
American Airlines
OMA
3:57a
ONT
11:27a
7h 30m
1 stop
ONT
8:59p
OMA
2:54a
5h 55m
1 stop
Depart: Tue Sep 22 2015 Return: Sun Sep 27 2015 Trip spans 6 days
American Airlines
American Airlines
MKE
2:24p
ONT
9:08p
6h 44m
1 stop
ONT
2:28a
MKE
9:35a
7h 07m
1 stop
Depart: Sun Sep 27 2015 Return: Tue Oct 6 2015 Trip spans 10 days
American Airlines
American Airlines
DTW
4:55p
ONT
10:52p
5h 57m
1 stop
ONT
10:15a
DTW
5:01p
6h 46m
1 stop
Depart: Sun Sep 6 2015 Return: Fri Sep 11 2015 Trip spans 6 days
Delta
Delta
BOS
1:40p
ONT
9:26p
7h 46m
1 stop
ONT
2:05a
BOS
9:17a
7h 12m
1 stop
Change your search
Airports
Origin

Milwaukee
$463
New York
only $376
only $379
Kansas City
$338
Detroit
$463
Sacramento
$256
Portland
$210
Seattle
$183
Chicago
$321
Austin
$348
Cleveland
$411
San Jose
$159
Omaha
$451
San Francisco
$159
Phoenix
$161
Salt Lake City
$172
Denver
$181
Dallas
$265
Houston
$428
Boston
$475
Destination

Ontario
$159