Direct flights from Denver to Ontario

Did you mean flights from Ontario to Denver?

Last updated on: 04-01-2026

Denver

United States

DEN

Denver International Airport

Ontario

United States

ONT

Ontario International Airport

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Flight schedule

Distance

817 miles · (1,315 km)

Flight time

2 hours and 30 minutes

Airlines

Frontier Airlines
Southwest Airlines
United Airlines

Alliances

Oneworld
SkyTeam
Star Alliance

Classes

Economy
Premium Economy
Business Class
First Class

Aircrafts

Airbus A320-100/200
Airbus A320neo
Airbus A321-100/200
Airbus A321neo
Boeing 737 MAX 8
Boeing 737 MAX 9
Boeing 737-800
Boeing 737-800 (winglets)
Boeing 737-900
Boeing 757

Denver to Ontario Flight Schedule

Scan through all non-stop flights from Denver to Ontario. The full flight schedule below gives an overview of all non-stop flights from DEN to ONT, which includes the daily timetable of every operating airline for the upcoming 12 months.

Note: for airline-specific flight schedules, please scroll further down.

Return schedule

Best time to visit Ontario

What is the best time to visit Ontario?

🌿 🍇 Warm Mediterranean

In Ontario, the summers are known for being warm, long, and dry, with temperatures typically reaching about 30°C (86°F). The area’s breathtaking scenery complements the sun-filled lifestyle, making it a popular destination for visitors all year round who are looking for relaxation, fun by the water, and the beauty of the outdoors.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Ontario is best explored from mid-spring to summer, specifically between April and September, as most rainfall occurs from October to February.

Ontario

ONT

Airlines flying from Denver to Ontario

Airline-specific flight schedules from Denver to Ontario

In total there are 3 airlines operating nonstop flights from Denver DEN to Ontario ONT. This section gives an overview of the flight schedules and timetables of every airline with direct flights for this route.

Click an airline below to view their DEN ONT flight schedule.

Frontier Airlines (F9)

Southwest Airlines (WN)

United Airlines (UA)

Frontier Airlines flight schedulefrom Denver to Ontario

Return schedule

Southwest Airlines flight schedulefrom Denver to Ontario

Return schedule

United Airlines flight schedulefrom Denver to Ontario

United Airlines is a member of Star Alliance

Return schedule

Denver to Ontario Flights

Flights from DEN to ONT are operated 48 times a week, with an average of 7 flights per day. Departure times vary between 06:00 - 22:30. The earliest flight departs at 06:00, the last flight departs at 22:30. However, this depends on the date you are flying so please check with the full flight schedule above to see which departure times are available on your preferred date(s) of travel.

You can fly in Economy and Business Class. Premium Economy and First Class are not available on this route (at least not as a non-stop flight).

The fastest direct flight from Denver to Ontario takes 2 hours and 30 minutes. The flight distance between Denver and Ontario is 817 miles (or 1,315 km).

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