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
Filed traffic dataIn May 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 29% of departures; flights ran 80% full.
Departures
485
May 2026
Seats
82,827
both directions
Passengers
66,077
both directions
Load factor
79.8%
RPM ÷ ASM
Who flies DEN–ONT?
Southwest Airlines operated the most nonstop DEN–ONT departures in May 2026 (220), one of 3 carriers on the route.
- WN
220 departures · 35,992 seats
Share of departures45.4%82.9%
Load
- UA
143 departures · 23,907 seats
Share of departures29.5%77.8%
Load
- F9
122 departures · 22,928 seats
Share of departures25.2%77.0%
Load
What plane flies DEN–ONT?
In May 2026, the Boeing 737-800 flew 29% of DEN–ONT departures — more than any other aircraft type.
- Boeing 737-800
139 departures · 81.5% load
28.7% - Boeing 737 MAX 8
102 departures · 81.7% load
21.0% - Airbus A320neo
79 departures · 76.4% load
16.3% - Boeing 737-700
66 departures · 85.7% load
13.6% - Airbus A320
33 departures · 70.1% load
6.8% - Boeing 737 MAX 9
32 departures · 80.5% load
6.6% - Airbus A321neo
27 departures · 78.0% load
5.6% - Airbus A321
4 departures · 63.5% load
0.8% - Boeing 737-900ER
3 departures · 66.3% load
0.6%
How has DEN–ONT traffic changed?
Nonstop DEN–ONT departures fell from 512 in June 2025 to 485 in May 2026.
Monthly nonstop DEN–ONT traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
485 departures · 66,077 passengers
79.8%
Load
By direction
Each direction is filed separately — they rarely match.
DEN → ONT
81.7% full
243 departures · 33,844 passengers
ONT → DEN
77.9% full
242 departures · 32,233 passengers
Nonstop DEN–ONT traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
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 May 2026, the Boeing 737-800 flew the largest share of departures (28.7%), followed by the Boeing 737 MAX 8 (21.0%).
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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