Find Cheap Flights from Ontario to Denver International (ONT - DEN)

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
Compare vs. KAYAK all | none
Browse Origins:
Browse Destinations:

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

Book cheap flights from Ontario to Denver International

(Round-trip)
Depart: Mon Jul 3 2017 Return: Tue Jul 4 2017 Trip spans 2 days
United
United
ONT
12:00a
DEN
2:17a
2h 17m
nonstop
DEN
12:00a
ONT
2:20a
2h 20m
nonstop
Depart: Wed Jun 28 2017 Return: Wed Jul 5 2017 Trip spans 8 days
Major Airline
Major Airline
ONT
12:00a
DEN
8:32a
8h 32m
1 stop
DEN
12:00a
ONT
6:30a
6h 30m
1 stop
Depart: Sat Jul 1 2017 Return: Mon Jul 10 2017 Trip spans 10 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:12a
4h 12m
1 stop
DEN
12:00a
ONT
4:26a
4h 26m
1 stop
Depart: Sun Jul 2 2017 Return: Fri Jul 7 2017 Trip spans 6 days
Delta
Delta
ONT
12:00a
DEN
8:11a
8h 11m
1 stop
DEN
12:00a
ONT
4:11a
4h 11m
1 stop
Depart: Sun Jul 2 2017 Return: Tue Jul 11 2017 Trip spans 10 days
United
United
ONT
12:00a
DEN
2:17a
2h 17m
nonstop
DEN
12:00a
ONT
2:20a
2h 20m
nonstop
Depart: Sun Jul 2 2017 Return: Wed Jul 5 2017 Trip spans 4 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
DEN
2:17a
2h 17m
nonstop
DEN
12:00a
ONT
4:12a
4h 12m
1 stop
Depart: Sun Jul 2 2017 Return: Mon Jul 10 2017 Trip spans 9 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:11a
4h 11m
1 stop
DEN
12:00a
ONT
4:05a
4h 05m
1 stop
Depart: Sun Jul 2 2017 Return: Tue Jul 4 2017 Trip spans 3 days
United
United
ONT
12:00a
DEN
2:17a
2h 17m
nonstop
DEN
12:00a
ONT
2:20a
2h 20m
nonstop
Depart: Thu Jun 29 2017 Return: Mon Jul 3 2017 Trip spans 5 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:11a
4h 11m
1 stop
DEN
12:00a
ONT
4:05a
4h 05m
1 stop
Depart: Sun Jul 2 2017 Return: Fri Jul 7 2017 Trip spans 6 days
Major Airline
Major Airline
ONT
12:00a
DEN
11:42a
11h 42m
1 stop
DEN
12:00a
ONT
4:31p
16h 31m
1 stop
Depart: Sun Jul 2 2017 Return: Mon Jul 3 2017 Trip spans 2 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:11a
4h 11m
1 stop
DEN
12:00a
ONT
4:05a
4h 05m
1 stop
Depart: Thu Jun 29 2017 Return: Fri Jun 30 2017 Trip spans 2 days
United
United
ONT
12:00a
DEN
2:19a
2h 19m
nonstop
DEN
12:00a
ONT
2:19a
2h 19m
nonstop
Depart: Sat Jul 1 2017 Return: Tue Jul 11 2017 Trip spans 11 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:12a
4h 12m
1 stop
DEN
12:00a
ONT
4:26a
4h 26m
1 stop
Depart: Wed Jun 28 2017 Return: Tue Jul 4 2017 Trip spans 7 days
United
United
ONT
12:00a
DEN
2:18a
2h 18m
nonstop
DEN
12:00a
ONT
2:20a
2h 20m
nonstop
Depart: Sun Jul 2 2017 Return: Wed Jul 12 2017 Trip spans 11 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:11a
4h 11m
1 stop
DEN
12:00a
ONT
4:31a
4h 31m
1 stop
Depart: Thu Jun 29 2017 Return: Fri Jul 7 2017 Trip spans 9 days
United
United
ONT
12:00a
DEN
2:19a
2h 19m
nonstop
DEN
12:00a
ONT
2:20a
2h 20m
nonstop
Depart: Sat Jul 1 2017 Return: Tue Jul 4 2017 Trip spans 4 days
Delta
Delta
ONT
12:00a
DEN
4:56a
4h 56m
1 stop
DEN
12:00a
ONT
4:48a
4h 48m
1 stop
Depart: Thu Jun 29 2017 Return: Sat Jul 8 2017 Trip spans 10 days
American Airlines
American Airlines
ONT
12:00a
DEN
4:11a
4h 11m
1 stop
DEN
12:00a
ONT
4:03a
4h 03m
1 stop
Depart: Fri Jun 30 2017 Return: Thu Jul 6 2017 Trip spans 7 days
United
United
ONT
12:00a
DEN
2:16a
2h 16m
nonstop
DEN
12:00a
ONT
2:19a
2h 19m
nonstop
Depart: Fri Jun 30 2017 Return: Thu Jul 6 2017 Trip spans 7 days
Multiple Airlines
Multiple Airlines
ONT
12:00a
DEN
5:49a
5h 49m
1 stop
DEN
12:00a
ONT
2:19a
2h 19m
nonstop
Direct flights ONT to DEN on United
Flight # Depart ONT Arrive DEN Sun Mon Tue Wed Thu Fri Sat Valid Between
1852 5:25 am 8:42 am Jul 14 - Jul 17
1852 5:25 am 8:42 am Jul 2 - Jul 10
1852 5:25 am 8:42 am Jul 6 - Jul 12
1852 5:25 am 8:43 am Aug 3 - Aug 3
1852 5:25 am 8:42 am Jul 30 - Aug 9
1852 5:25 am 8:42 am Jul 29 - Jul 29
1852 5:25 am 8:42 am Jul 13 - Jul 19
1852 5:25 am 8:43 am Jul 20 - Jul 20
1852 5:25 am 8:42 am Jul 21 - Jul 28
1635 1:25 pm 4:44 pm Jul 3 - Aug 17
1635 1:25 pm 4:44 pm Jul 7 - Aug 4
5903 1:25 pm 4:48 pm Jul 9 - Aug 13
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an email and someone from our team will get back to you promptly.

Airports
Origin

Ontario
$329
Destination

Denver
$329
Airlines Airline reviews

21 travelers who booked a flight from Ontario to Denver rated their chosen airlines with an average of 7.4.

Overall
7.7
Boarding
7.7
Crew
7.8
Comfort
7.5
Food
6.9
Entertainment
6.7