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
US DOT T-100 · filed dataIn April 2026, United Airlines operated the most departures, one of 2 carriers flying nonstop IAD–IAH; the Boeing 737-900ER was the most common aircraft at 69% of departures; flights ran 83% full.
Departures
295
April 2026
Seats
49,909
both directions
Passengers
41,309
both directions
Load factor
82.8%
passengers ÷ seats
Who flies IAD–IAH?
United Airlines operated the most nonstop IAD–IAH departures in April 2026 (294), one of 2 carriers on the route.
- UA
United Airlines
294 departures · 49,859 seats
Share of departures99.7%82.8%
Load
- C5
CommuteAir
1 departures · 50 seats
Share of departures0.3%10.0%
Load
What plane flies IAD–IAH?
In April 2026, the Boeing 737-900ER flew 69% of IAD–IAH departures — more than any other aircraft type.
- Boeing 737-900ER
203 departures · 83.2% load
68.8% - Airbus A319
27 departures · 88.7% load
9.2% - Boeing 737 MAX 9
20 departures · 73.9% load
6.8% - Boeing 737-700
18 departures · 90.7% load
6.1% - Boeing 737-800
15 departures · 88.0% load
5.1% - Airbus A320
7 departures · 74.7% load
2.4% - Airbus A321neo
2 departures · 37.5% load
0.7% - Boeing 737 MAX 8
2 departures · 66.3% load
0.7% - Embraer ERJ-145
1 departures · 10.0% load
0.3%
How has IAD–IAH traffic changed?
Nonstop IAD–IAH departures fell from 382 in May 2025 to 295 in April 2026.
Monthly nonstop IAD–IAH traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
382 departures · 54,171 passengers
85.4%
Load
June 2025
356 departures · 51,316 passengers
86.9%
Load
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
By direction
The DOT files each direction separately — they rarely match.
IAH → IAD
83.8% full
148 departures · 20,944 passengers
IAD → IAH
81.8% full
147 departures · 20,365 passengers
Nonstop IAD–IAH 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 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 April 2026, the Boeing 737-900ER flew the largest share of departures (68.8%), followed by the Airbus A319 (9.2%).
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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