Dulles (IAD) to Houston (IAH)
Flight time
≈ 3h 11m
Bearing
244° SW
Dulles (IAD) to Houston (IAH) is 1,189 miles (1,913 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAD–IAH
Filed traffic dataIn June 2026, United Airlines operated the most departures, one of 5 carriers flying nonstop IAD–IAH; the Boeing 737-900ER was the most common aircraft at 54% of departures; flights ran 86% full.
Departures
366
June 2026
Seats
62,035
both directions
Passengers
53,500
both directions
Load factor
86.2%
RPM ÷ ASM
Who flies IAD–IAH?
United Airlines operated the most nonstop IAD–IAH departures in June 2026 (362), one of 5 carriers on the route.
- UA
362 departures · 61,609 seats
Share of departures98.9%86.8%
Load
- 27Q
1 departures · 16 seats
Share of departures0.3%25.0%
Load
- C5
1 departures · 50 seats
Share of departures0.3%28.0%
Load
- N8
1 departures · 290 seats
Share of departures0.3%0.0%
Load
- YV
1 departures · 70 seats
Share of departures0.3%28.6%
Load
What plane flies IAD–IAH?
In June 2026, the Boeing 737-900ER flew 54% of IAD–IAH departures — more than any other aircraft type.
- Boeing 737-900ER
196 departures · 87.3% load
53.5% - Boeing 737-800
63 departures · 88.2% load
17.2% - Boeing 737 MAX 9
42 departures · 83.6% load
11.5% - Boeing 737-700
39 departures · 92.1% load
10.7% - Airbus A320
11 departures · 81.3% load
3.0% - Boeing 737 MAX 8
8 departures · 91.5% load
2.2% - Airbus A321neo
2 departures · 53.5% load
0.5% - Boeing 787-9
1 departures · 5.5% load
0.3% - Gulfstream Aerospace G-III
1 departures · 25.0% load
0.3% - Embraer E175
1 departures · 28.6% load
0.3% - Embraer ERJ-145
1 departures · 28.0% load
0.3% - Airbus A330-200
1 departures · 0.0% load
0.3%
How has IAD–IAH traffic changed?
Nonstop IAD–IAH departures rose from 317 in July 2025 to 366 in June 2026.
Monthly nonstop IAD–IAH traffic, trailing 12 months through June 2026. Bars scale to the busiest month; months with no filed service show as zero.
July 2025
317 departures · 44,322 passengers
87.4%
Load
August 2025
354 departures · 48,294 passengers
83.7%
Load
September 2025
388 departures · 48,292 passengers
74.6%
Load
October 2025
360 departures · 46,331 passengers
80.5%
Load
November 2025
300 departures · 40,851 passengers
79.9%
Load
December 2025
283 departures · 42,059 passengers
87.1%
Load
January 2026
256 departures · 35,089 passengers
84.2%
Load
February 2026
228 departures · 31,288 passengers
83.4%
Load
March 2026
295 departures · 39,588 passengers
82.7%
Load
April 2026
295 departures · 41,309 passengers
82.8%
Load
May 2026
333 departures · 47,234 passengers
82.2%
Load
June 2026
366 departures · 53,500 passengers
86.2%
Load
By direction
Each direction is filed separately — they rarely match.
IAH → IAD
84.4% full
186 departures · 26,529 passengers
IAD → IAH
88.1% full
180 departures · 26,971 passengers
Nonstop IAD–IAH traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through June 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Dulles (IAD) from Houston (IAH)?
IAD to IAH is 1,189 miles (1,913 km / 1,033 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAD to IAH?
A nonstop covers the 1,189-mile great-circle distance in roughly 3h 11m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAD–IAH?
In June 2026, the Boeing 737-900ER flew the largest share of departures (53.5%), followed by the Boeing 737-800 (17.2%).
What mileage do I earn flying IAD–IAH?
Distance-based programs credit off the 1,189-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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