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

United Airlines and Alaska Airlines fly nonstop between Houston (IAH) and Seattle (SEA), roughly 53 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 IAH to SEA 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.

See IAH to SEA on the interactive map Get started free
53
Nonstop flights a week
1,873 mi
Nonstop distance
Free
To get started

Houston to Seattle flight schedule

Scheduled nonstop departures for IAH to SEA, 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 Houston (IAH) to Seattle (SEA)
Date Flight Airline Departs IAH Arrives SEA Duration Aircraft
AS 241Alaska Airlines, Inc.07:0209:424h 40m73J
UA 2205United Airlines09:5712:484h 51m7M9
UA 2228United Airlines12:0414:524h 48m7M8
AS 439Alaska Airlines, Inc.14:3417:194h 45m73J
UA 2638United Airlines16:2019:084h 48m738
UA 692United Airlines18:3021:184h 48m738
UA 2341United Airlines18:4521:364h 51m738
AS 241Alaska Airlines, Inc.07:0209:424h 40m73J
UA 2205United Airlines09:5712:484h 51m7M9
UA 2228United Airlines12:0414:524h 48m7M8
AS 439Alaska Airlines, Inc.14:3417:194h 45m7M9
UA 2638United Airlines16:2019:084h 48m738
UA 692United Airlines18:3021:184h 48m738
UA 2341United Airlines18:4521:364h 51m738
AS 241Alaska Airlines, Inc.07:0209:424h 40m73J
UA 2205United Airlines09:5712:484h 51m7M9
UA 2228United Airlines12:0414:524h 48m7M8
AS 439Alaska Airlines, Inc.14:3417:194h 45m7M9
UA 2638United Airlines16:2019:084h 48m738
UA 692United Airlines18:3021:184h 48m738
UA 2341United Airlines18:4521:364h 51m738
UA 2456United Airlines19:5522:424h 47m7M9
AS 241Alaska Airlines, Inc.07:0209:424h 40m73J
UA 2205United Airlines09:5712:484h 51m7M9
UA 2228United Airlines12:0414:524h 48m7M8
AS 439Alaska Airlines, Inc.14:3417:194h 45m7M9
UA 2638United Airlines16:2019:084h 48m738
UA 692United Airlines18:3021:184h 48m738
UA 2341United Airlines18:4521:364h 51m738
UA 2456United Airlines19:5522:424h 47m7M9
AS 241Alaska Airlines, Inc.08:0010:414h 41m73J
UA 2205United Airlines09:5712:484h 51m7M9
UA 2228United Airlines12:0414:524h 48m7M8
AS 439Alaska Airlines, Inc.14:3417:194h 45m7M9
UA 2638United Airlines16:2019:084h 48m738
UA 2341United Airlines18:4521:364h 51m738
UA 2456United Airlines19:5522:424h 47m7M9
AS 241Alaska Airlines, Inc.08:0010:414h 41m73J
UA 2205United Airlines09:5712:484h 51m7M9
UA 2228United Airlines12:0414:524h 48m7M8

Showing the first 40 of 53 scheduled IAH to SEA 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 IAH to SEA date on the interactive map

Confirmed upgrade & award space on IAH to SEA departures

2LNR tracks confirmed upgrade and award space on Alaska Airlines, segment by segment and date by date. Open the calendar for Houston to Seattle 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 IAH to SEA 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 IAH to SEA on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Houston to Seattle nonstop

Carriers operating IAH to SEA nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

See IAH to SEA on the interactive map →

Frequently asked questions about IAH to SEA

How far is Seattle from Houston?
IAH to SEA 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 IAH to SEA?
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 IAH to SEA?
About 53 nonstop flights a week run between Houston and Seattle 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 IAH to SEA depart?
Scheduled IAH to SEA nonstops in the next 7 days with service leave between 07:02 and 19:55, local time at Houston. 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 IAH to SEA?
Open the IAH to SEA 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 IAH to SEA 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