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
Filed traffic dataIn May 2026, United Airlines operated the most departures, one of 3 carriers flying nonstop IAH–ONT; the Boeing 737-900 was the most common aircraft at 44% of departures; flights ran 72% full.
Departures
123
May 2026
Seats
25,230
both directions
Passengers
18,231
both directions
Load factor
72.3%
RPM ÷ ASM
Who flies IAH–ONT?
United Airlines operated the most nonstop IAH–ONT departures in May 2026 (62), one of 3 carriers on the route.
- UA
62 departures · 11,098 seats
Share of departures50.4%77.0%
Load
- F9
60 departures · 13,942 seats
Share of departures48.8%68.3%
Load
- AA
1 departures · 190 seats
Share of departures0.8%82.6%
Load
What plane flies IAH–ONT?
In May 2026, the Boeing 737-900 flew 44% of IAH–ONT departures — more than any other aircraft type.
- Boeing 737-900
54 departures · 76.3% load
43.9% - Airbus A321
36 departures · 66.8% load
29.3% - Airbus A321neo
23 departures · 69.8% load
18.7% - Boeing 737-900ER
8 departures · 81.5% load
6.5% - Airbus A320neo
2 departures · 89.5% load
1.6%
How has IAH–ONT traffic changed?
Nonstop IAH–ONT departures rose from 75 in June 2025 to 123 in May 2026.
Monthly nonstop IAH–ONT traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
123 departures · 18,231 passengers
72.3%
Load
By direction
Each direction is filed separately — they rarely match.
ONT → IAH
68.5% full
62 departures · 8,707 passengers
IAH → ONT
76.1% full
61 departures · 9,524 passengers
Nonstop IAH–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 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 May 2026, the Boeing 737-900 flew the largest share of departures (43.9%), followed by the Airbus A321 (29.3%).
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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