How long is the flight from Washington Dulles to Seattle?

IAD–SEA is 5h 50m nonstop, covering 3,702 km (2,300 mi).

Which airlines fly nonstop from Washington Dulles to Seattle?

Alaska Airlines, Delta Air Lines, United Airlines operate this route nonstop.

How much is a flight from Washington Dulles to Seattle?

One-way fares on IAD–SEA recently started from $172 ($192 nonstop). The lowest recent fare is for travel in December 2026. Fares change daily, so check current prices before booking.

How often do flights run from Washington Dulles to Seattle?

The route is served 7 days a week (21 scheduled departures).

Flights from Washington Dulles to Seattle

IADSEA

Washington Dulles International Airport (Dulles, United States) → Seattle–Tacoma International Airport (Seattle, United States)

Nonstop: 5h 50m
Distance: 3,702 km
Frequency: 7×/week
One-way from: $172
Airlines: Alaska Airlines, Delta Air Lines, United Airlines

Book on Aviasales

Fares by month

One-way, per person

Lowest fares Aviasales travelers found in recent searches; some may include a connection. Prices change often — tap a month to see live fares.

Weekly schedule

Monday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:46→10:365h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Tuesday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:46→10:365h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Wednesday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:46→10:365h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Thursday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:46→10:365h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Friday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:46→10:365h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Saturday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:46→10:365h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Sunday

DL101507:05→09:565h 51mDelta Air Lines
AS40907:05→09:555h 50mAlaska Airlines
AS73717:17→20:135h 56mAlaska Airlines

Washington Dulles to Seattle — frequently asked

How long is the flight from Washington Dulles to Seattle?: IAD–SEA is 5h 50m nonstop, covering 3,702 km (2,300 mi).
Which airlines fly nonstop from Washington Dulles to Seattle?: Alaska Airlines, Delta Air Lines, United Airlines operate this route nonstop.
How much is a flight from Washington Dulles to Seattle?: One-way fares on IAD–SEA recently started from $172 ($192 nonstop). The lowest recent fare is for travel in December 2026. Fares change daily, so check current prices before booking.
How often do flights run from Washington Dulles to Seattle?: The route is served 7 days a week (21 scheduled departures).