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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 May 16 2015 Return: Wed May 27 2015 Trip spans 12 days
United
United
DEN
ONT
2h 24m
nonstop
ONT
DEN
6h 02m
1 stop
Depart: Wed May 6 2015 Return: Sat May 9 2015 Trip spans 4 days
Alaska Airlines
Alaska Airlines
SEA
ONT
2h 22m
nonstop
ONT
SEA
2h 37m
nonstop
Depart: Mon Jun 1 2015 Return: Fri Jun 5 2015 Trip spans 5 days
American Airlines
American Airlines
PHX
ONT
1h 17m
nonstop
ONT
PHX
1h 13m
nonstop
Depart: Tue May 5 2015 Return: Sat May 9 2015 Trip spans 5 days
Alaska Airlines
Alaska Airlines
PDX
ONT
2h 15m
nonstop
ONT
PDX
2h 16m
nonstop
Depart: Thu May 14 2015 Return: Mon May 18 2015 Trip spans 5 days
United
United
SFO
ONT
1h 27m
nonstop
ONT
SFO
1h 27m
nonstop
Depart: Sun May 10 2015 Return: Sat May 16 2015 Trip spans 7 days
American Airlines
American Airlines
OAK
ONT
5h 18m
1 stop
ONT
OAK
5h 54m
1 stop
Depart: Sun Jun 28 2015 Return: Fri Jul 3 2015 Trip spans 6 days
United
United
SMF
ONT
3h 14m
1 stop
ONT
SMF
3h 01m
1 stop
Depart: Wed May 27 2015 Return: Sat May 30 2015 Trip spans 4 days
US Airways
US Airways
DFW
ONT
7h 33m
1 stop
ONT
DFW
4h 32m
1 stop
Depart: Thu May 21 2015 Return: Mon May 25 2015 Trip spans 5 days
Delta
Delta
SLC
ONT
1h 51m
nonstop
ONT
SLC
1h 50m
nonstop
Depart: Sat May 9 2015 Return: Sat May 16 2015 Trip spans 8 days
American Airlines
American Airlines
AUS
ONT
6h 48m
1 stop
ONT
AUS
6h 20m
1 stop
Depart: Tue Sep 15 2015 Return: Tue Sep 22 2015 Trip spans 8 days
United
United
ATL
ONT
7h 10m
1 stop
ONT
ATL
8h 07m
1 stop
Depart: Tue May 12 2015 Return: Wed May 13 2015 Trip spans 2 days
American Airlines
American Airlines
MSP
ONT
5h 03m
1 stop
ONT
MSP
5h 14m
1 stop
Depart: Wed Sep 30 2015 Return: Tue Oct 6 2015 Trip spans 7 days
United
United
STL
ONT
8h 29m
1 stop
ONT
STL
7h 33m
1 stop
Depart: Sat May 23 2015 Return: Wed Jun 3 2015 Trip spans 12 days
United
United
IND
ONT
7h 17m
1 stop
ONT
IND
7h 22m
1 stop
Depart: Mon May 4 2015 Return: Sat May 9 2015 Trip spans 6 days
American Airlines
American Airlines
LGA
ONT
10h 00m
1 stop
ONT
LGA
7h 31m
1 stop
Depart: Fri May 8 2015 Return: Mon May 11 2015 Trip spans 4 days
United
United
EWR
ONT
8h 52m
1 stop
ONT
EWR
8h 52m
1 stop
Depart: Wed Jul 22 2015 Return: Tue Jul 28 2015 Trip spans 7 days
United
United
ORD
ONT
8h 57m
1 stop
ONT
ORD
7h 39m
1 stop
Depart: Sat Aug 8 2015 Return: Mon Aug 17 2015 Trip spans 10 days
American Airlines
American Airlines
BOS
ONT
7h 42m
1 stop
ONT
BOS
7h 08m
1 stop
Depart: Mon May 25 2015 Return: Wed Jun 3 2015 Trip spans 10 days
US Airways
US Airways
DTW
ONT
5h 58m
1 stop
ONT
DTW
5h 55m
1 stop
Depart: Thu Sep 17 2015 Return: Tue Sep 22 2015 Trip spans 6 days
United
United
FLL
ONT
15h 50m
2 stops
ONT
FLL
8h 00m
1 stop
Airports
Origin

New York
$311
Detroit
$357
Sacramento
$238
Portland
$194
Seattle
$174
Chicago
$321
Fort Lauderdale
$363
Austin
$257
Oakland
$227
St Louis
$301
San Francisco
$210
Minneapolis
$293
Atlanta
$281
Phoenix
$182
Salt Lake City
$256
Newark
$311
Denver
$157
Dallas
$241
Boston
$353
Indianapolis
$307
Destination

Ontario
$157