Direct flights from Ontario to Denver

Did you mean Flights from Denver to Ontario?

Ontario

United States

ONT

Ontario International Airport

Denver

United States

DEN

Denver International Airport

Route: Nonstop service available
Distance: 818 miles
Airlines: 5 airlines
Aircraft: 11 aircraft types
Dates: Sep 7, 2026 – Sep 5, 2027

Ontario to Denver route overview

Ontario International Airport (ONT) serves Ontario; Denver International Airport (DEN) serves Denver.

The airports are 818 miles apart by great-circle distance.

Roame's current schedule feed shows nonstop service from ONT to DEN.

Airlines represented in the current schedule are Air Canada (AC), Frontier Airlines (F9), United Airlines (UA), Southwest Airlines (WN) and Volaris (Y4).

Published schedule dates span Sep 7, 2026 – Sep 5, 2027.

Airlines on the Ontario to Denver route

Airline alliance affiliations represented: Star Alliance

Aircraft flying from ONT to DEN

Frequently asked questions

Which airports serve the Ontario to Denver route?

Ontario International Airport (ONT) is the origin airport and Denver International Airport (DEN) is the destination airport.

How far is Denver from Ontario?

ONT and DEN are approximately 818 miles apart by great-circle distance.

Are there direct flights from ONT to DEN?

Yes. Roame's current schedule feed shows nonstop service from ONT to DEN.

Which airlines fly from ONT to DEN?

Airlines represented in the current schedule are Air Canada (AC), Frontier Airlines (F9), United Airlines (UA), Southwest Airlines (WN) and Volaris (Y4).

Which aircraft fly from ONT to DEN?

Aircraft listed in the current schedule include Airbus A319 (319), Airbus A320 (320), Airbus A321 (321), Airbus A320neo (32N), Airbus A321neo (32Q), Boeing 737-800 (738), Boeing 737-900 / Boeing 737-900ER (739), Boeing 737-800 Winglets (73H), Boeing 737 MAX 8 (7M8), 7S7 and JET.