--- title: "Seattle (SEA) to Houston (IAH) flights: who flies it" description: "Alaska Airlines and United Airlines fly nonstop from SEA to IAH, about 38 flights a week. See confirmed upgrade and award space by date on 2LNR, the next 14 days free." canonical: "https://2lnr.com/routes/sea-iah" url: "https://2lnr.com/routes/sea-iah.md" date_modified: "2026-10-18T05:10:47Z" --- # Seattle to Houston (SEA-IAH): nonstop upgrade & award space United Airlines and Alaska Airlines fly nonstop between Seattle (SEA) and Houston (IAH), roughly 38 times a week. The timetable below shows the nonstop scheduled at 4h 14m to 4h 30m for the 1,873 miles. 2LNR checks confirmed upgrade and award space on Alaska Airlines flights on this route, so you can see which departures have space before you book. Schedule last confirmed October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 23, 2026. See SEA to IAH on the interactive map [Get started free](https://2lnr.com/login) 38 Flights a week, 4-week average 4h 14m to 4h 30m Scheduled flight time 1,873 mi Nonstop distance Free To get started ## 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](https://2lnr.com/seatmaps/ua/737-800.md) | | Fri, Oct 23 | AS 438 | Alaska Airlines, Inc. | 10:47 | 17:14 | 4h 27m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md) | | Fri, Oct 23 | UA 1752 | United Airlines | 12:00 | 18:30 | 4h 30m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md) | | 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](https://2lnr.com/seatmaps/ua/737-max-8.md) | | 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](https://2lnr.com/seatmaps/as/737-900.md) | | 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](https://2lnr.com/seatmaps/ua/a320.md) | | 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](https://2lnr.com/seatmaps/ua/737-900.md) | | 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](https://2lnr.com/seatmaps/ua/737-900.md), the [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md), the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md), the [Boeing 737 MAX 8](https://2lnr.com/seatmaps/ua/737-max-8.md), and the [Airbus A320](https://2lnr.com/seatmaps/ua/a320.md), and Alaska Airlines flies the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md) and the [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md). 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. - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) - [Alaska Airlines (AS) route map](https://2lnr.com/routes/airlines/as.md)\ [The aircraft AS flies](https://2lnr.com/seatmaps/as.md) 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. Flying the other way? See [IAH to SEA upgrade and award space](https://2lnr.com/routes/iah-sea.md). Award seats rather than schedules? See [Alaska Airlines award availability](https://2lnr.com/awards/as.md). Looking beyond this route? See [every route from Seattle (SEA)](https://2lnr.com/routes/sea.md), or [every route from Houston (IAH)](https://2lnr.com/routes/iah.md). Nonstops to Houston (IAH) from other airports within 150 miles of Seattle (SEA): - [Vancouver (YVR) to Houston (IAH)](https://2lnr.com/routes/yvr-iah.md), 127 miles from SEA - [Portland (PDX) to Houston (IAH)](https://2lnr.com/routes/pdx-iah.md), 129 miles from SEA Nonstops from Seattle (SEA) to other airports within 150 miles of Houston (IAH): - [Seattle (SEA) to Austin (AUS)](https://2lnr.com/routes/sea-aus.md), 140 miles from IAH Distances are great-circle between the airports, not driving distance. - [How Alaska upgrades clear](https://2lnr.com/about/as/upgrades.md) - [How to read award availability by date](https://2lnr.com/guides/award-availability.md) ## Never miss SEA to IAH upgrade or award space See what's open by date on this route, the next 14 days free on every product and the full horizon on Pro. [Get started free](https://2lnr.com/login)