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Uncover the best deals on Denver to Ontario flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest DEN - ONT Flights
Useful information for finding best airline tickets from Denver International to Ontario International on your next trip.
Cheapest Round Trip Flight
$200
Frontier Airlines
• 1 stop
• 18h 46m
Jul 23 – Jul 26
The cheapest round trip flight from Denver to Ontario (DEN-ONT-DEN) is currently $200
Cheapest Direct Flight
$280
Frontier Airlines
• nonstop
• 3h 39m
Jul 23
The cheapest nonstop flight from Denver to Ontario (DEN-ONT) is currently $280
Fastest Flight
3h 39m
The fastest nonstop flight from Denver to Ontario (DEN-ONT) takes 3h 39m
Top Airlines Flying from Denver to Ontario
Latest Flight Deals from Denver (DEN) to Ontario (ONT)
Compare and book low fare round-trip air tickets from Denver to Ontario. Ideal for travelers with confirmed return itineraries.
Jul 23 - Jul 26, Economy
Denver → Ontario
18h 46m
9:06 PM - 7:32 AM • 1 stop
Denver → Ontario
27h 5m
3:40 PM - 9:05 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
17h 24m
6:10 AM - 3:54 PM • 1 stop
Denver → Ontario
24h 16m
11:52 AM - 3:48 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
28h 29m
6:58 PM - 11:07 AM • 1 stop
Denver → Ontario
18h 28m
3:40 PM - 3:48 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
27h 18m
4:25 PM - 8:03 AM • 1 stop
Denver → Ontario
24h 16m
11:52 AM - 3:48 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
3h 39m
8:45 AM - 10:04 AM • nonstop
Denver → Ontario
3h 41m
10:49 AM - 2:10 PM • nonstop
Frontier Airlines
Flying to Ontario soon? We've surfaced some of the most affordable last-minute flights from Denver to Ontario, ideal for urgent plans or spontaneous trips.
Jul 23 - Jul 26, Economy
Denver → Ontario
18h 46m
9:06 PM - 7:32 AM • 1 stop
Denver → Ontario
27h 5m
3:40 PM - 9:05 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
17h 24m
6:10 AM - 3:54 PM • 1 stop
Denver → Ontario
24h 16m
11:52 AM - 3:48 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
28h 29m
6:58 PM - 11:07 AM • 1 stop
Denver → Ontario
18h 28m
3:40 PM - 3:48 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
27h 18m
4:25 PM - 8:03 AM • 1 stop
Denver → Ontario
24h 16m
11:52 AM - 3:48 AM • 1 stop
Frontier Airlines
Jul 23 - Jul 26, Economy
Denver → Ontario
3h 39m
8:45 AM - 10:04 AM • nonstop
Denver → Ontario
3h 41m
10:49 AM - 2:10 PM • nonstop
Frontier Airlines
Looking for the fastest way to Ontario? These direct flight options from DEN to ONT offer both convenience and value—no layovers, just straight to your destination.
Jul 23 - Jul 26, Economy
Denver → Ontario
3h 39m
8:45 AM - 10:04 AM • nonstop
Denver → Ontario
3h 41m
10:49 AM - 2:10 PM • nonstop
Frontier Airlines
FAQs on Denver to Ontario Flights
What are the airports in Denver?
DEN
What’s the most popular airline flying from DEN to ONT?
The most popular airline flying from Denver to Ontario are
Can I fly from DEN to ONT non-stop?
Yes, you can fly DEN to ONT non-stop on
Which airlines fly nonstop between Denver and Ontario?
The non-stop flights between Denver and Ontario are .
What’s the earliest departure time from DEN to ONT Airport?
The earliest flight leaves DEN at 6:10 am and lands in ONT - Ontario International
What are the airports in Ontario?
ONT
Can I make changes to my Denver to Ontario flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from DEN to ONT?
Read the fare rules of the Denver to Ontario air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Denver and Ontario?
operate flights between Denver and Ontario
How long does a flight from Denver to Ontario take?
It takes approximately 2 hour to fly non-stop from DEN to ONT, which is 818.62 miles by air.
Which airlines provide the cheapest flights from Denver (DEN) to Ontario (ONT) ?
In the past couple of days, the cheapest tickets to ONT from DEN were found on F9 : USD 212
Do I need a passport to fly between DEN and ONT?
No
What’s the latest departure time from DEN to ONT ?
The last flight leaves DEN at 10:29 pm
Denver (DEN) to Ontario (ONT): Airport Information
| Origin Airport | Denver International , Denver, US |
| Destination Airport | Ontario International , Ontario, US |
| Distance | 819 miles |
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