How long does the flight from Seattle to Washington take?

Flight time from Seattle (SEA) to Washington (IAD) depends on routing, aircraft type, and whether the flight is direct or connecting. A direct flight typically reflects great-circle distance plus winds, while one-stop options can add several hours depending on the layover airport. Check the exact duration in the search results above, where we show block time per itinerary along with stop count.

Which airlines fly from Seattle to Washington?

Airline availability for SEA to IAD changes by season and sometimes week to week as carriers adjust capacity. Our search above pulls live schedules and returns the airlines currently selling this route, both direct and connecting. Codeshare and interline itineraries are included, so you may see results operated by one carrier but sold by another.

Are there direct flights from Seattle to Washington?

Direct (nonstop) availability on SEA to IAD varies by date, day of week, and season. Busy city pairs usually have multiple daily nonstops, while thinner routes may only have direct service a few days per week or only during peak seasons. Use our search above with flexible dates to see which days actually have nonstop options.

What is the cheapest month to fly from Seattle to Washington?

Prices on SEA to IAD shift with seasonality, school holidays, and major events at both ends. Our 12-month price calendar below the search results shows the lowest fare found per departure date, which makes it easy to spot the cheapest weeks at a glance. Flexibility of a few days around your target date often unlocks significantly lower fares.

Seattle to Washington flights

Direct and connecting flights from Seattle (SEA) to Washington (IAD). Compare airlines, aircraft, and fares.

Distance: 3,702 km (2,300 mi)
Flight time: ~4h 41m
Airlines: 1
Aircraft types: 3

Airlines flying SEA → IAD

Airline	Aircraft types	Observations
United Airlines	3	3

Aircraft on this route

Boeing 737 — 1 operator
Boeing 777 — 1 operator
Airbus A321 — 1 operator

Airport details

Departure: Seattle Tacoma International Airport (SEA)

City: Seattle
Country: United States
IATA / ICAO: SEA / KSEA

Arrival: Washington Dulles International Airport (IAD)

City: Washington
Country: United States
IATA / ICAO: IAD / KIAD

Operating airlines

Alaska Airlines (AS)
Delta Air Lines (DL)
United Airlines (UA)

Distance: 3710 km. Duration: 302 minutes.

Other routes from Seattle

Other routes to Washington

Frequently asked questions

How many airlines fly SEA to IAD?

1 airline operates the SEA to IAD route in our 90-day observed dataset.

What aircraft fly the SEA-IAD route?

The most commonly observed aircraft on SEA to IAD include: Boeing 737, Boeing 777, Airbus A321.

How long is the Seattle to Washington flight?

The estimated flight time from Seattle (SEA) to Washington (IAD) is approximately 4h 41m, based on a cruise speed of 850 km/h.

What's the distance from Seattle to Washington?

The great-circle distance from Seattle (SEA) to Washington (IAD) is approximately 3,702 km (2,300 miles).

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