Houston (IAH) to Seattle (SEA)
Flight time
≈ 4h 33m
Bearing
318° NW
Houston (IAH) to Seattle (SEA) is 1,872 miles (3,013 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAH–SEA
Filed traffic dataIn July 2026, United Airlines operated the most departures, one of 2 carriers flying nonstop IAH–SEA; the Boeing 737-800 was the most common aircraft at 29% of departures; flights ran 91% full.
Departures
460
July 2026
Seats
78,979
both directions
Passengers
72,065
both directions
Load factor
91.3%
RPM ÷ ASM
Who flies IAH–SEA?
United Airlines operated the most nonstop IAH–SEA departures in July 2026 (278), one of 2 carriers on the route.
- UA
278 departures · 46,923 seats
Share of departures60.4%91.4%
Load
- AS
182 departures · 32,056 seats
Share of departures39.6%91.0%
Load
What plane flies IAH–SEA?
In July 2026, the Boeing 737-800 flew 29% of IAH–SEA departures — more than any other aircraft type.
- Boeing 737-800
133 departures · 93.8% load
28.9% - Boeing 737 MAX 9
113 departures · 91.0% load
24.6% - Boeing 737-900ER
98 departures · 90.7% load
21.3% - Boeing 737-900
50 departures · 92.0% load
10.9% - Boeing 737 MAX 8
34 departures · 85.1% load
7.4% - Airbus A320
32 departures · 88.3% load
7.0%
How has IAH–SEA traffic changed?
Nonstop IAH–SEA departures rose from 451 in August 2025 to 460 in July 2026.
Monthly nonstop IAH–SEA traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
August 2025
451 departures · 67,781 passengers
88.4%
Load
September 2025
399 departures · 54,945 passengers
82.1%
Load
October 2025
354 departures · 49,675 passengers
83.4%
Load
November 2025
297 departures · 42,268 passengers
85.2%
Load
December 2025
339 departures · 48,114 passengers
84.8%
Load
January 2026
269 departures · 38,327 passengers
82.8%
Load
February 2026
224 departures · 32,992 passengers
87.5%
Load
March 2026
284 departures · 43,492 passengers
88.2%
Load
April 2026
300 departures · 45,302 passengers
87.0%
Load
May 2026
365 departures · 53,566 passengers
85.3%
Load
June 2026
433 departures · 65,087 passengers
87.4%
Load
July 2026
460 departures · 72,065 passengers
91.3%
Load
By direction
Each direction is filed separately — they rarely match.
IAH → SEA
91.5% full
230 departures · 36,340 passengers
SEA → IAH
91.0% full
230 departures · 35,725 passengers
Nonstop IAH–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Houston (IAH) from Seattle (SEA)?
IAH to SEA is 1,872 miles (3,013 km / 1,627 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAH to SEA?
A nonstop covers the 1,872-mile great-circle distance in roughly 4h 33m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAH–SEA?
In July 2026, the Boeing 737-800 flew the largest share of departures (28.9%), followed by the Boeing 737 MAX 9 (24.6%).
What mileage do I earn flying IAH–SEA?
Distance-based programs credit off the 1,872-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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