Denver to Ontario (DEN-ONT): nonstop flights and who flies them

United Airlines and Frontier Airlines fly nonstop between Denver (DEN) and Ontario (ONT), roughly 34 times a week. The timetable below shows the nonstop scheduled at 2h 20m to 2h 28m for the 817 miles.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

Updated .

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34
Flights a week, 4-week average
2h 20m to 2h 28m
Scheduled flight time
817 mi
Nonstop distance
Free
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Denver to Ontario flight schedule

Scheduled nonstop departures for DEN to ONT starting October 22, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Denver (DEN) to Ontario (ONT)
Date Flight Airline Departs DEN Arrives ONT Duration Aircraft
F9 2907Frontier Airlines09:0110:292h 28mAirbus A320neo
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:2923:502h 21mAirbus A321
F9 2907Frontier Airlines09:0110:292h 28mAirbus A320neo
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:2923:502h 21mAirbus A320neo
F9 2907Frontier Airlines09:0110:292h 28mAirbus A321
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:2923:502h 21mAirbus A320neo
F9 2907Frontier Airlines09:0110:292h 28mAirbus A320neo
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:2923:502h 21mAirbus A320neo
F9 2907Frontier Airlines09:0110:292h 28mAirbus A320neo
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
UA 1542United Airlines19:3020:562h 26mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:2923:502h 21mAirbus A320neo
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
F9 2907Frontier Airlines12:1513:402h 25mAirbus A320neo
UA 1542United Airlines19:3020:562h 26mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:3423:552h 21mAirbus A320neo
UA 430United Airlines11:2612:462h 20mBoeing 737 MAX 9
F9 2907Frontier Airlines12:1513:402h 25mAirbus A320neo
UA 1542United Airlines19:3020:562h 26mBoeing 737 MAX 9
UA 2028United Airlines19:3520:582h 23mBoeing 737-900
F9 1261Frontier Airlines22:2923:512h 22mAirbus A320neo

Showing all 31 scheduled DEN to ONT departures across 7 days with service, starting October 22, 2026. Later dates are on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure.

See every DEN to ONT date on the interactive map

Aircraft on the Denver to Ontario nonstop

In the schedule table on this page, United Airlines flies the Boeing 737 MAX 9 and the Boeing 737-900, and Frontier Airlines flies the Airbus A320neo and the Airbus A321. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure.

The full DEN to ONT nonstop schedule

This page carries the full DEN to ONT nonstop schedule, who operates each departure and how often it runs; the reverse direction is linked below.

See the schedule

Who operates each DEN to ONT nonstop and how often it runs, from 2LNR's schedule data.

Plan on the map

See DEN to ONT on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Denver to Ontario nonstop

Carriers operating DEN to ONT nonstop in the current schedule.

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Frequently asked questions about DEN to ONT

How long is the flight from Denver (DEN) to Ontario (ONT)?
Scheduled flight times from Denver (DEN) to Ontario (ONT) run from 2h 20m to 2h 28m across the departures in the schedule table on this page. The nonstop covers about 817 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.
Which airlines fly nonstop from DEN to ONT?
United Airlines and Frontier Airlines fly DEN to ONT nonstop. 2LNR doesn't show award or upgrade space for any of them on DEN to ONT, so this page carries the schedule rather than a space claim.
How many flights a week are there from DEN to ONT?
About 34 nonstop flights a week run between Denver (DEN) and Ontario (ONT) in the current schedule, operated by United Airlines and Frontier Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.
What time do flights from DEN to ONT depart?
Scheduled DEN to ONT nonstops in the next 7 days with service leave between 09:01 and 22:34, local time at Denver. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
Which flights operate DEN to ONT nonstop?
In the schedule table on this page, DEN to ONT nonstops fly as UA 430, UA 1542, and UA 2028 on United Airlines, and F9 1261 and F9 2907 on Frontier Airlines. The table lists each departure by date with its times and aircraft.
Does 2LNR show upgrade or award space on DEN to ONT?
Not on this route: 2LNR doesn't show award or upgrade space for any airline flying DEN to ONT. The page carries the full DEN to ONT nonstop schedule and who flies each departure, and the reverse direction is linked below.

See the full DEN to ONT nonstop schedule

Every scheduled departure on this route, with who flies it. 2LNR shows upgrade and award space by date on the carriers it tracks, the next 14 days free on every product and the full horizon on Pro.

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