--- title: "Washington (IAD) to Seattle (SEA) flights: who flies it" description: "Alaska Airlines, Delta Air Lines and United Airlines fly nonstop from IAD to SEA, about 31 flights a week. Upgrade and award space by date on 2LNR, next 14 days free." canonical: "https://2lnr.com/routes/iad-sea" url: "https://2lnr.com/routes/iad-sea.md" date_modified: "2026-10-18T05:10:47Z" --- # Washington to Seattle (IAD-SEA): nonstop upgrade & award space Alaska Airlines, United Airlines, and Delta Air Lines fly nonstop between Washington (IAD) and Seattle (SEA), roughly 31 times a week. The timetable below shows the nonstop scheduled at 5h 42m to 6h 6m for the 2,300 miles. 2LNR checks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines 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 IAD to SEA on the interactive map [Get started free](https://2lnr.com/login) 31 Flights a week, 4-week average 5h 42m to 6h 6m Scheduled flight time 2,300 mi Nonstop distance Free To get started ## Washington to Seattle flight schedule Scheduled nonstop departures for IAD to SEA 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 Washington (IAD) to Seattle (SEA) | Date | Flight | Airline | Departs IAD | Arrives SEA | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Fri, Oct 23 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md) | | Fri, Oct 23 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | [Airbus A220-300](https://2lnr.com/seatmaps/dl/a220-300.md) | | Fri, Oct 23 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md) | | Fri, Oct 23 | UA 1824 | United Airlines | 13:05 | 15:51 | 5h 46m | [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md) | | Fri, Oct 23 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:24 | 5h 51m | Boeing 737 MAX 9 | | Fri, Oct 23 | UA 1128 | United Airlines | 17:45 | 20:37 | 5h 52m | Boeing 737 MAX 9 | | Sat, Oct 24 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | Boeing 737 MAX 9 | | Sat, Oct 24 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | Airbus A220-300 | | Sat, Oct 24 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | Boeing 737-900 | | Sat, Oct 24 | UA 1824 | United Airlines | 13:05 | 15:51 | 5h 46m | Boeing 737 MAX 9 | | Sat, Oct 24 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:27 | 5h 54m | 737 | | Sat, Oct 24 | UA 1128 | United Airlines | 17:45 | 20:37 | 5h 52m | Boeing 737 MAX 9 | | Sun, Oct 25 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | Boeing 737 MAX 9 | | Sun, Oct 25 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | Airbus A220-300 | | Sun, Oct 25 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | Boeing 737-900 | | Sun, Oct 25 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:24 | 5h 51m | Boeing 737 MAX 9 | | Sun, Oct 25 | UA 1128 | United Airlines | 17:45 | 20:37 | 5h 52m | Boeing 737 MAX 9 | | Mon, Oct 26 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | Boeing 737-900 | | Mon, Oct 26 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | Airbus A220-300 | | Mon, Oct 26 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | Boeing 737 MAX 9 | | Mon, Oct 26 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:24 | 5h 51m | Boeing 737 MAX 9 | | Mon, Oct 26 | UA 1128 | United Airlines | 17:45 | 20:37 | 5h 52m | Boeing 737 MAX 9 | | Tue, Oct 27 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | Boeing 737 MAX 9 | | Tue, Oct 27 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | Airbus A220-300 | | Tue, Oct 27 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | Boeing 737 MAX 9 | | Tue, Oct 27 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:27 | 5h 54m | 737 | | Tue, Oct 27 | UA 1128 | United Airlines | 17:50 | 20:56 | 6h 6m | Boeing 737 MAX 9 | | Wed, Oct 28 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | Boeing 737 MAX 9 | | Wed, Oct 28 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | Airbus A220-300 | | Wed, Oct 28 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | Boeing 737-900 | | Wed, Oct 28 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:27 | 5h 54m | 737 | | Wed, Oct 28 | UA 1128 | United Airlines | 17:50 | 20:56 | 6h 6m | Boeing 737 MAX 9 | | Thu, Oct 29 | AS 409 | Alaska Airlines, Inc. | 07:02 | 09:44 | 5h 42m | Boeing 737-900 | | Thu, Oct 29 | DL 1015 | Delta Air Lines | 07:05 | 09:56 | 5h 51m | Airbus A220-300 | | Thu, Oct 29 | AS 375 | Alaska Airlines, Inc. | 09:38 | 12:20 | 5h 42m | [Boeing 737-800](https://2lnr.com/seatmaps/as/737-800.md) | | Thu, Oct 29 | AS 737 | Alaska Airlines, Inc. | 17:33 | 20:24 | 5h 51m | Boeing 737 MAX 9 | | Thu, Oct 29 | UA 1128 | United Airlines | 17:45 | 20:37 | 5h 52m | Boeing 737 MAX 9 | Showing all 37 scheduled IAD to SEA 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 IAD to SEA date on the interactive map ## Aircraft on the Washington to Seattle nonstop In the schedule table on this page, Alaska Airlines flies the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/as/737-max-9.md), the [Boeing 737-900](https://2lnr.com/seatmaps/as/737-900.md), the Boeing 737, and the [Boeing 737-800](https://2lnr.com/seatmaps/as/737-800.md). United Airlines flies the [Boeing 737 MAX 9](https://2lnr.com/seatmaps/ua/737-max-9.md). Delta Air Lines flies the [Airbus A220-300](https://2lnr.com/seatmaps/dl/a220-300.md). Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## Confirmed upgrade & award space on IAD to SEA departures 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines, segment by segment and date by date. Open the calendar for Washington to Seattle to see which departures have space, the next 14 days free on every product and the full horizon on Pro. In the 7 days to October 19, 2026, 2LNR checked award space on Washington to Seattle departures from October 19 to November 1. Alaska Airlines had space open on 7 of 14 dates checked and Delta Air Lines on 13 of 14. ### See real availability Confirmed upgrade or award seats by date on the IAD to SEA 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 IAD to SEA on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying Washington to Seattle nonstop Carriers operating IAD to SEA nonstop in the current schedule. Where 2LNR tracks the carrier, its departures show confirmed upgrade or award space by date. - [Alaska Airlines (AS) route map](https://2lnr.com/routes/airlines/as.md)\ [The aircraft AS flies](https://2lnr.com/seatmaps/as.md) - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) - [Delta Air Lines (DL) route map](https://2lnr.com/routes/airlines/dl.md)\ [The aircraft DL flies](https://2lnr.com/seatmaps/dl.md) See IAD to SEA on the interactive map → ## Frequently asked questions about IAD to SEA **How long is the flight from Washington (IAD) to Seattle (SEA)?** Scheduled flight times from Washington (IAD) to Seattle (SEA) run from 5h 42m to 6h 6m across the departures in the schedule table on this page. The nonstop covers about 2,300 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from IAD to SEA?** Alaska Airlines, United Airlines, and Delta Air Lines fly IAD to SEA nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines and Delta Air Lines. **How many flights a week are there from IAD to SEA?** About 31 nonstop flights a week run between Washington (IAD) and Seattle (SEA) in the current schedule, operated by Alaska Airlines, United Airlines, and Delta Air Lines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from IAD to SEA depart?** Scheduled IAD to SEA nonstops in the next 7 days with service leave between 07:02 and 17:50, local time at Washington. The schedule table on this page lists every departure by date, with its arrival time and aircraft. **Which flights operate IAD to SEA nonstop?** In the schedule table on this page, IAD to SEA nonstops fly as AS 375, AS 409, and AS 737 on Alaska Airlines; UA 1128 and UA 1824 on United Airlines; and DL 1015 on Delta Air Lines. The table lists each departure by date with its times and aircraft. **How do I check upgrade or award availability on IAD to SEA?** Open the IAD to SEA route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines and Delta Air Lines, 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 [SEA to IAD upgrade and award space](https://2lnr.com/routes/sea-iad.md). Award seats rather than schedules? See [Alaska Airlines award availability](https://2lnr.com/awards/as.md) or [Delta Air Lines award availability](https://2lnr.com/awards/dl.md). Looking beyond this route? See [every route from Washington (IAD)](https://2lnr.com/routes/iad.md), or [every route from Seattle (SEA)](https://2lnr.com/routes/sea.md). Nonstops to Seattle (SEA) from other airports within 150 miles of Washington (IAD): - [Washington (DCA) to Seattle (SEA)](https://2lnr.com/routes/dca-sea.md), 23 miles from IAD - [Baltimore (BWI) to Seattle (SEA)](https://2lnr.com/routes/bwi-sea.md), 45 miles from IAD - [Philadelphia (PHL) to Seattle (SEA)](https://2lnr.com/routes/phl-sea.md), 134 miles from IAD Nonstops from Washington (IAD) to other airports within 150 miles of Seattle (SEA): - [Washington (IAD) to Vancouver (YVR)](https://2lnr.com/routes/iad-yvr.md), 127 miles from SEA - [Washington (IAD) to Portland (PDX)](https://2lnr.com/routes/iad-pdx.md), 129 miles from SEA 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 IAD to SEA 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)