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Find Flight Deals from Ontario to Denver International (ONT - DEN)

Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from Ontario to Denver International

(Round-trip)
Depart: Sat Feb 21 2015 Return: Sat Mar 7 2015 Trip spans 15 days
United
United
ONT
12:30a
DEN
5:42a
5h 12m
1 stop
DEN
6:05a
ONT
8:26a
2h 21m
nonstop
Depart: Tue Feb 24 2015 Return: Sat Mar 7 2015 Trip spans 12 days
United
United
ONT
6:35a
DEN
1:10p
6h 35m
1 stop
DEN
6:05a
ONT
8:26a
2h 21m
nonstop
Depart: Wed Feb 25 2015 Return: Sat Mar 7 2015 Trip spans 11 days
United
United
ONT
10:50a
DEN
3:24p
4h 34m
1 stop
DEN
6:05a
ONT
8:26a
2h 21m
nonstop
Depart: Sat Feb 28 2015 Return: Sat Mar 7 2015 Trip spans 8 days
United
United
ONT
8:50a
DEN
1:38p
4h 48m
1 stop
DEN
6:05a
ONT
8:26a
2h 21m
nonstop
Depart: Wed Mar 4 2015 Return: Tue Mar 10 2015 Trip spans 6 days
American Airlines
American Airlines
ONT
7:40a
DEN
11:39a
3h 59m
1 stop
DEN
1:45a
ONT
6:06a
4h 21m
1 stop
Depart: Wed Mar 25 2015 Return: Tue Mar 31 2015 Trip spans 7 days
US Airways
US Airways
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
DEN
1:45a
ONT
6:07a
4h 22m
1 stop
Depart: Mon Mar 2 2015 Return: Wed Mar 4 2015 Trip spans 3 days
American Airlines
American Airlines
ONT
2:25p
DEN
6:35p
4h 10m
1 stop
DEN
3:05a
ONT
7:34a
4h 29m
1 stop
Depart: Tue Mar 3 2015 Return: Tue Mar 10 2015 Trip spans 7 days
American Airlines
American Airlines
ONT
1:30a
DEN
5:32a
4h 02m
1 stop
DEN
1:45a
ONT
6:06a
4h 21m
1 stop
Depart: Thu Apr 9 2015 Return: Sat Apr 11 2015 Trip spans 3 days
US Airways
US Airways
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
DEN
1:45a
ONT
6:07a
4h 22m
1 stop
Depart: Sat Apr 11 2015 Return: Mon Apr 13 2015 Trip spans 3 days
American Airlines
American Airlines
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
DEN
1:45a
ONT
6:07a
4h 22m
1 stop
Depart: Thu Apr 16 2015 Return: Sat Apr 18 2015 Trip spans 3 days
US Airways
US Airways
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
DEN
10:55a
ONT
3:05p
4h 10m
1 stop
Depart: Fri Apr 17 2015 Return: Wed Apr 22 2015 Trip spans 6 days
American Airlines
American Airlines
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
DEN
4:00a
ONT
8:33a
4h 33m
1 stop
Depart: Sat Apr 18 2015 Return: Thu Apr 23 2015 Trip spans 6 days
American Airlines
American Airlines
ONT
2:30a
DEN
6:26a
3h 56m
1 stop
DEN
1:45a
ONT
6:07a
4h 22m
1 stop
Depart: Wed Apr 22 2015 Return: Sun Apr 26 2015 Trip spans 5 days
American Airlines
American Airlines
ONT
12:40p
DEN
4:44p
4h 04m
1 stop
DEN
1:45a
ONT
6:05a
4h 20m
1 stop
Depart: Thu Apr 23 2015 Return: Sun Apr 26 2015 Trip spans 4 days
American Airlines
American Airlines
ONT
3:25p
DEN
7:35p
4h 10m
1 stop
DEN
1:45a
ONT
6:05a
4h 20m
1 stop
Depart: Fri Apr 24 2015 Return: Mon Apr 27 2015 Trip spans 4 days
US Airways
US Airways
ONT
8:35a
DEN
12:35p
4h 00m
1 stop
DEN
10:55a
ONT
3:05p
4h 10m
1 stop
Depart: Thu Mar 5 2015 Return: Mon Mar 9 2015 Trip spans 4 days
Delta
Delta
ONT
1:15a
DEN
6:24a
5h 09m
1 stop
DEN
3:05p
ONT
7:34p
4h 29m
1 stop
Depart: Tue Mar 10 2015 Return: Mon Mar 16 2015 Trip spans 7 days
Delta
Delta
ONT
2:15a
DEN
6:10a
3h 55m
1 stop
DEN
3:05p
ONT
7:34p
4h 29m
1 stop
Depart: Thu Mar 12 2015 Return: Mon Mar 16 2015 Trip spans 5 days
Delta
Delta
ONT
2:15a
DEN
6:10a
3h 55m
1 stop
DEN
3:05p
ONT
7:34p
4h 29m
1 stop
Depart: Thu May 21 2015 Return: Sun May 31 2015 Trip spans 11 days
Multiple Airlines
Multiple Airlines
ONT
3:30p
DEN
7:36p
4h 06m
1 stop
DEN
3:35a
ONT
8:58a
5h 23m
1 stop
Change your search
Direct flights ONT to DEN on United
Flight # Depart ONT Arrive DEN Sun Mon Tue Wed Thu Fri Sat Valid Between
5547 6:00 am 9:20 am Jan 31 - Feb 28
5547 6:00 am 9:24 am Mar 5 - Mar 6
5547 6:00 am 9:24 am Mar 7 - Mar 7
5547 6:00 am 9:20 am Mar 11 - Apr 1
5547 6:00 am 9:24 am Mar 8 - Apr 6
5547 6:00 am 9:20 am Jan 29 - Mar 4
5575 1:15 pm 4:32 pm Jan 29 - Feb 10
5583 1:15 pm 4:28 pm Feb 4 - Feb 11
6281 1:15 pm 4:32 pm Feb 2 - Feb 9
6281 1:23 pm 4:40 pm Feb 12 - Mar 4
Airports
Origin

Ontario
$171
Destination

Denver
$171