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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
$199
Southwest Airlines
• nonstop
• 3h 55m
Nov 10 – Nov 13
The cheapest round trip flight from Denver to Ontario (DEN-ONT-DEN) is currently $199
Cheapest One way Flight
$189
Alaska Airlines
• 2 stops
• 40h 55m
Sep 25
The cheapest one way flight from Denver to Ontario (DEN-ONT) is currently $189
Cheapest Direct Flight
$199
Southwest Airlines
• nonstop
• 3h 55m
Nov 10
The cheapest nonstop flight from Denver to Ontario (DEN-ONT) is currently $199
Fastest Flight
3h 40m
The fastest nonstop flight from Denver to Ontario (DEN-ONT) takes 3h 40m
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.
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 55m
5:25 PM - 7:00 PM • nonstop
Denver → Ontario
3h 35m
8:40 PM - 11:55 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 45m
1:15 PM - 2:40 PM • nonstop
Denver → Ontario
3h 35m
1:20 PM - 4:35 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
7h 20m
6:05 AM - 9:45 AM • 1 stop
Denver → Ontario
3h 35m
8:05 AM - 11:20 AM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
8h 50m
8:45 AM - 1:15 PM • 1 stop
Denver → Ontario
3h 35m
2:45 PM - 6:00 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
8h 50m
10:00 AM - 2:30 PM • 1 stop
Denver → Ontario
3h 35m
8:05 AM - 11:20 AM • nonstop
Southwest Airlines
Explore competitive one-way airfare options for DEN - ONT flights. Best suited for flexible or open-ended travel plans.
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.
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.
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 55m
5:25 PM - 7:00 PM • nonstop
Denver → Ontario
3h 35m
8:40 PM - 11:55 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 45m
1:50 PM - 3:15 PM • nonstop
Denver → Ontario
3h 35m
8:40 PM - 11:55 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 40m
8:45 AM - 10:05 AM • nonstop
Denver → Ontario
3h 35m
8:40 PM - 11:55 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 45m
8:20 PM - 9:45 PM • nonstop
Denver → Ontario
3h 35m
8:40 PM - 11:55 PM • nonstop
Southwest Airlines
Nov 10 - Nov 13, Economy
Denver → Ontario
3h 45m
1:15 PM - 2:40 PM • nonstop
Denver → Ontario
3h 35m
1:20 PM - 4:35 PM • nonstop
Southwest 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 5:30 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 AS : USD 367
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 8:20 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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