Seattle (SEA) to Houston (IAH) flights: who flies it

Seattle to Houston flight schedule

Scheduled nonstop departures for SEA to IAH starting October 23, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Scheduled nonstop departures from Seattle (SEA) to Houston (IAH)
Date	Flight	Airline	Departs SEA	Arrives IAH	Duration	Aircraft
Fri, Oct 23	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Fri, Oct 23	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737 MAX 9
Fri, Oct 23	UA 1752	United Airlines	12:00	18:30	4h 30m	Boeing 737 MAX 9
Fri, Oct 23	UA 1660	United Airlines	17:05	23:29	4h 24m	Boeing 737 MAX 9
Fri, Oct 23	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737 MAX 9
Fri, Oct 23	UA 2379	United Airlines	23:59	06:17	4h 18m	Boeing 737 MAX 8
Fri, Oct 23	UA 2702	United Airlines	23:59	06:17	4h 18m	Boeing 737 MAX 8
Sat, Oct 24	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Sat, Oct 24	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737 MAX 9
Sat, Oct 24	UA 1752	United Airlines	12:00	18:30	4h 30m	Boeing 737 MAX 9
Sat, Oct 24	UA 1660	United Airlines	17:05	23:29	4h 24m	Boeing 737 MAX 9
Sat, Oct 24	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737-900
Sat, Oct 24	UA 2379	United Airlines	23:59	06:17	4h 18m	Boeing 737 MAX 8
Sat, Oct 24	UA 2702	United Airlines	23:59	06:17	4h 18m	Boeing 737 MAX 8
Sun, Oct 25	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Sun, Oct 25	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737 MAX 9
Sun, Oct 25	UA 434	United Airlines	14:00	20:16	4h 16m	Airbus A320
Sun, Oct 25	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737 MAX 9
Sun, Oct 25	UA 2767	United Airlines	23:59	06:13	4h 14m	Boeing 737-900
Mon, Oct 26	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Mon, Oct 26	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737-900
Mon, Oct 26	UA 434	United Airlines	13:59	20:20	4h 21m	Boeing 737-900
Mon, Oct 26	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737 MAX 9
Mon, Oct 26	UA 2767	United Airlines	23:59	06:13	4h 14m	Boeing 737-900
Tue, Oct 27	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Tue, Oct 27	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737 MAX 9
Tue, Oct 27	UA 434	United Airlines	13:59	20:20	4h 21m	Boeing 737-900
Tue, Oct 27	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737-900
Tue, Oct 27	UA 2767	United Airlines	23:59	06:13	4h 14m	Boeing 737-900
Wed, Oct 28	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Wed, Oct 28	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737 MAX 9
Wed, Oct 28	UA 434	United Airlines	13:59	20:20	4h 21m	Boeing 737-900
Wed, Oct 28	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737 MAX 9
Wed, Oct 28	UA 2767	United Airlines	23:59	06:13	4h 14m	Boeing 737-900
Thu, Oct 29	UA 2135	United Airlines	07:17	13:40	4h 23m	Boeing 737-800
Thu, Oct 29	AS 438	Alaska Airlines, Inc.	10:47	17:14	4h 27m	Boeing 737-900
Thu, Oct 29	UA 434	United Airlines	13:59	20:20	4h 21m	Boeing 737-900
Thu, Oct 29	AS 240	Alaska Airlines, Inc.	17:35	23:59	4h 24m	Boeing 737 MAX 9
Thu, Oct 29	UA 2379	United Airlines	23:59	06:13	4h 14m	Boeing 737-900
Thu, Oct 29	UA 2767	United Airlines	23:59	06:13	4h 14m	Boeing 737-900

Showing all 40 scheduled SEA to IAH departures across 7 days with service, starting October 23, 2026. Later dates are on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure.

See every SEA to IAH date on the interactive map

Aircraft on the Seattle to Houston nonstop

In the schedule table on this page, United Airlines flies the Boeing 737-900, the Boeing 737-800, the Boeing 737 MAX 9, the Boeing 737 MAX 8, and the Airbus A320, and Alaska Airlines flies the Boeing 737 MAX 9 and the Boeing 737-900. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure.

Confirmed upgrade & award space on SEA to IAH departures

2LNR tracks confirmed upgrade and award space on Alaska Airlines, segment by segment and date by date. Open the calendar for Seattle to Houston to see which departures have space, the next 14 days free on every product and the full horizon on Pro.

Alaska Airlines award space was open on 11 of the 14 Seattle to Houston departure dates from October 19 to November 1 that 2LNR checked in the 7 days to October 19, 2026.

See real availability

Confirmed upgrade or award seats by date on the SEA to IAH departures 2LNR tracks, checked against live inventory so you know what's open before you book.

Set an alert

Premium inventory turns over fast. Watch this route on Pro and 2LNR notifies you when space appears on a date you're tracking.

Plan on the map

See SEA to IAH on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Seattle to Houston nonstop

Carriers operating SEA to IAH nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date.

See SEA to IAH on the interactive map →

Frequently asked questions about SEA to IAH

How long is the flight from Seattle (SEA) to Houston (IAH)?

Scheduled flight times from Seattle (SEA) to Houston (IAH) run from 4h 14m to 4h 30m across the departures in the schedule table on this page. The nonstop covers about 1,873 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.

Which airlines fly nonstop from SEA to IAH?

United Airlines and Alaska Airlines fly SEA to IAH nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines.

How many flights a week are there from SEA to IAH?

About 38 nonstop flights a week run between Seattle (SEA) and Houston (IAH) in the current schedule, operated by United Airlines and Alaska Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.

What time do flights from SEA to IAH depart?

Scheduled SEA to IAH nonstops in the next 7 days with service leave between 07:17 and 23:59, local time at Seattle. The schedule table on this page lists every departure by date, with its arrival time and aircraft.

Which flights operate SEA to IAH nonstop?

The schedule table on this page lists 9 flight numbers for SEA to IAH nonstops, including UA 434, UA 1660, UA 1752, UA 2135, UA 2379, and UA 2767 on United Airlines, and AS 240 and AS 438 on Alaska Airlines. The table lists each departure by date with its times and aircraft.

How do I check upgrade or award availability on SEA to IAH?

Open the SEA to IAH route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines, the next 14 days free and the full horizon on Pro. On Pro you can also set an alert on the route and 2LNR notifies you when space opens.