Seattle to Houston (SEA-IAH): nonstop upgrade & award space

United Airlines and Alaska Airlines fly nonstop between Seattle (SEA) and Houston (IAH), roughly 68 times a week. With United Airlines running most of the schedule, the shape of a week is predictable, which makes an open premium seat on a given date easy to spot and quick to lose. 2LNR tracks confirmed upgrade and award space on Alaska Airlines, on every SEA to IAH departure, so you know which flights have space before you book.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

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68
Nonstop flights a week
1,873 mi
Nonstop distance
Free
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Seattle to Houston flight schedule

Scheduled nonstop departures for SEA to IAH, last checked against our schedule feed on September 6, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Seattle (SEA) to Houston (IAH)
Date Flight Airline Departs SEA Arrives IAH Duration Aircraft
UA 2748United Airlines05:0011:214h 21m7M8
UA 2135United Airlines07:0013:284h 28m7M9
AS 438Alaska Airlines, Inc.10:4117:134h 32m7M9
UA 2293United Airlines11:5518:354h 40m739
UA 1752United Airlines12:1018:404h 30m7M9
UA 1660United Airlines17:0023:244h 24m739
AS 1573Alaska Airlines, Inc.17:3323:594h 26m7M9
AS 240Alaska Airlines, Inc.17:3423:594h 25m73J
AS 398Alaska Airlines, Inc.23:5706:204h 23m73J
UA 2379United Airlines23:5906:174h 18m7M9
UA 2135United Airlines07:0013:284h 28m7M9
AS 438Alaska Airlines, Inc.10:4117:134h 32m7M9
UA 2293United Airlines11:5518:354h 40m739
UA 1752United Airlines12:1018:404h 30m7M9
UA 1660United Airlines17:0023:244h 24m739
AS 1573Alaska Airlines, Inc.17:3323:594h 26m7M9
AS 240Alaska Airlines, Inc.17:3423:594h 25m73J
AS 398Alaska Airlines, Inc.23:5706:204h 23m73J
UA 2379United Airlines23:5906:174h 18m7M9
UA 2748United Airlines05:0011:214h 21m7M8
UA 2135United Airlines07:0013:284h 28m7M9
AS 438Alaska Airlines, Inc.10:4117:134h 32m73J
UA 2293United Airlines11:5518:354h 40m739
UA 1752United Airlines12:1018:404h 30m7M9
UA 1660United Airlines17:0023:244h 24m739
AS 1573Alaska Airlines, Inc.17:3323:594h 26m7M9
AS 240Alaska Airlines, Inc.17:3423:594h 25m73J
AS 398Alaska Airlines, Inc.23:5706:204h 23m73J
UA 2379United Airlines23:5906:174h 18m7M9
UA 2135United Airlines07:0013:284h 28m7M9
AS 438Alaska Airlines, Inc.10:4117:134h 32m73J
UA 2293United Airlines11:5518:354h 40m739
UA 1752United Airlines12:1018:404h 30m7M9
UA 1660United Airlines17:0023:244h 24m739
AS 1573Alaska Airlines, Inc.17:3323:594h 26m7M9
AS 240Alaska Airlines, Inc.17:3423:594h 25m7M9
AS 398Alaska Airlines, Inc.23:5706:204h 23m73J
UA 2379United Airlines23:5906:174h 18m7M9
UA 2135United Airlines07:0013:284h 28m7M9
AS 438Alaska Airlines, Inc.10:4117:134h 32m7M9

Showing the first 40 of 69 scheduled SEA to IAH departures across the next 7 days with service. Every remaining date is 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 has not filed that value in the schedule data we hold. Aircraft are IATA equipment codes as filed, and can change up to departure.

See every SEA to IAH date on the interactive map

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.

See real availability

Confirmed upgrade and award seats on each SEA to IAH departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are 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. 2LNR tracks confirmed upgrade and award space on each of them.

See SEA to IAH on the interactive map →

Frequently asked questions about SEA to IAH

How far is Houston from Seattle?
SEA to IAH covers about 1,873 miles nonstop. Flight times vary by aircraft and season; the schedule table on this page lists each scheduled departure with its own times.
Which airlines fly nonstop from SEA to IAH?
United Airlines and Alaska Airlines fly the route nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines.
How many flights a week are there from SEA to IAH?
About 68 nonstop flights a week run between Seattle and Houston 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 05:00 and 23:59, local time at Seattle. The schedule table on this page lists every departure by date, with its arrival time 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.

Never miss SEA to IAH upgrade or award space

See what is open by date on this route, the next 14 days free on every product and the full horizon on Pro.

Get started free