Denver (DEN) to Ontario (ONT)
Flight time
≈ 2h 26m
Bearing
245° SW
Denver (DEN) to Ontario (ONT) is 817 miles (1,316 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies DEN–ONT
US DOT T-100 · filed dataIn April 2026, Southwest Airlines operated the most departures, one of 3 carriers flying nonstop DEN–ONT; the Boeing 737-800 was the most common aircraft at 32% of departures; flights ran 84% full.
Departures
409
April 2026
Seats
69,405
both directions
Passengers
57,963
both directions
Load factor
83.5%
passengers ÷ seats
Who flies DEN–ONT?
Southwest Airlines operated the most nonstop DEN–ONT departures in April 2026 (211), one of 3 carriers on the route.
- WN
Southwest Airlines
211 departures · 34,455 seats
Share of departures51.6%84.3%
Load
- UA
United Airlines
120 departures · 19,282 seats
Share of departures29.3%88.3%
Load
- F9
Frontier Airlines
78 departures · 15,668 seats
Share of departures19.1%75.8%
Load
What plane flies DEN–ONT?
In April 2026, the Boeing 737-800 flew 32% of DEN–ONT departures — more than any other aircraft type.
- Boeing 737-800
129 departures · 83.3% load
31.5% - Boeing 737 MAX 8
79 departures · 86.7% load
19.3% - Boeing 737-700
65 departures · 84.3% load
15.9% - Airbus A320
55 departures · 89.5% load
13.5% - Airbus A320neo
43 departures · 82.8% load
10.5% - Airbus A321neo
18 departures · 68.2% load
4.4% - Airbus A321
10 departures · 66.3% load
2.4% - Boeing 737-900ER
10 departures · 89.7% load
2.4%
How has DEN–ONT traffic changed?
Nonstop DEN–ONT departures fell from 511 in May 2025 to 409 in April 2026.
Monthly nonstop DEN–ONT traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
511 departures · 67,858 passengers
79.8%
Load
June 2025
512 departures · 72,836 passengers
82.5%
Load
July 2025
537 departures · 77,389 passengers
82.7%
Load
August 2025
506 departures · 69,249 passengers
75.5%
Load
September 2025
474 departures · 62,769 passengers
75.1%
Load
October 2025
481 departures · 67,622 passengers
78.6%
Load
November 2025
442 departures · 61,081 passengers
76.5%
Load
December 2025
391 departures · 53,937 passengers
78.2%
Load
January 2026
370 departures · 49,573 passengers
77.3%
Load
February 2026
341 departures · 46,143 passengers
78.3%
Load
March 2026
396 departures · 54,754 passengers
83.7%
Load
April 2026
409 departures · 57,963 passengers
83.5%
Load
By direction
The DOT files each direction separately — they rarely match.
DEN → ONT
84.0% full
205 departures · 29,240 passengers
ONT → DEN
83.0% full
204 departures · 28,723 passengers
Nonstop DEN–ONT traffic has been filed with the US DOT since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through April 2026; filings from 2025. Public domain (US Government work). The DOT publishes roughly three months in arrears.
The airports
Frequently asked
How far is Denver (DEN) from Ontario (ONT)?
DEN to ONT is 817 miles (1,316 km / 710 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from DEN to ONT?
A nonstop covers the 817-mile great-circle distance in roughly 2h 26m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies DEN–ONT?
In April 2026, the Boeing 737-800 flew the largest share of departures (31.5%), followed by the Boeing 737 MAX 8 (19.3%).
What mileage do I earn flying DEN–ONT?
Distance-based programs credit off the 817-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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