Houston (IAH) to Ontario (ONT)
Flight time
≈ 3h 28m
Bearing
288° W
Houston (IAH) to Ontario (ONT) is 1,331 miles (2,142 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAH–ONT
US DOT T-100 · filed dataIn April 2026, United Airlines operated the most departures, one of 2 carriers flying nonstop IAH–ONT; the Boeing 737-900 was the most common aircraft at 68% of departures; flights ran 83% full.
Departures
78
April 2026
Seats
14,980
both directions
Passengers
12,452
both directions
Load factor
83.1%
passengers ÷ seats
Who flies IAH–ONT?
United Airlines operated the most nonstop IAH–ONT departures in April 2026 (60), one of 2 carriers on the route.
- UA
United Airlines
60 departures · 10,740 seats
Share of departures76.9%83.4%
Load
- F9
Frontier Airlines
18 departures · 4,240 seats
Share of departures23.1%82.3%
Load
What plane flies IAH–ONT?
In April 2026, the Boeing 737-900 flew 68% of IAH–ONT departures — more than any other aircraft type.
- Boeing 737-900
53 departures · 83.4% load
68.0% - Airbus A321neo
10 departures · 80.8% load
12.8% - Airbus A321
8 departures · 84.4% load
10.3% - Boeing 737-900ER
7 departures · 83.7% load
9.0%
How has IAH–ONT traffic changed?
Nonstop IAH–ONT departures fell from 88 in May 2025 to 78 in April 2026.
Monthly nonstop IAH–ONT traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
88 departures · 13,199 passengers
87.2%
Load
June 2025
75 departures · 12,977 passengers
89.9%
Load
July 2025
77 departures · 12,964 passengers
88.4%
Load
August 2025
79 departures · 12,084 passengers
80.3%
Load
September 2025
87 departures · 13,119 passengers
79.9%
Load
October 2025
97 departures · 13,999 passengers
79.4%
Load
November 2025
95 departures · 11,887 passengers
77.0%
Load
December 2025
87 departures · 13,491 passengers
85.7%
Load
January 2026
83 departures · 10,904 passengers
71.4%
Load
February 2026
72 departures · 9,993 passengers
76.9%
Load
March 2026
78 departures · 10,902 passengers
78.1%
Load
April 2026
78 departures · 12,452 passengers
83.1%
Load
By direction
The DOT files each direction separately — they rarely match.
IAH → ONT
80.9% full
39 departures · 6,062 passengers
ONT → IAH
85.3% full
39 departures · 6,390 passengers
Nonstop IAH–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 Houston (IAH) from Ontario (ONT)?
IAH to ONT is 1,331 miles (2,142 km / 1,157 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAH to ONT?
A nonstop covers the 1,331-mile great-circle distance in roughly 3h 28m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAH–ONT?
In April 2026, the Boeing 737-900 flew the largest share of departures (68.0%), followed by the Airbus A321neo (12.8%).
What mileage do I earn flying IAH–ONT?
Distance-based programs credit off the 1,331-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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