Cheap flights from Dulles Intl (IAD) to Seattle (SEA)

IAD — SEA
Oct 4 — Oct 111

How to find the cheapest flight from Dulles Intl (IAD) to Seattle (SEA)

All the information you need to plan the best IAD to SEA flight in 2022: compare Dulles Intl to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.

IAD - SEA

Price

$237 - $668

SEA

Temperature

41 - 66.2 °F

SEA

Rainfall

0.7 - 6.6 inches

Popular inJulyHigh demand for flights, 40% potential price rise
Cheapest inFebruaryBest time to find cheap flights, 41% potential price drop
Round-trip from$237From Washington, D.C. Dulles Intl to Seattle/Tacoma Intl
One-way from$149One-way flight from Washington, D.C. Dulles Intl to Seattle/Tacoma Intl

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to Seattle?

Users have found that booking a flight from Washington, D.C. Dulles Intl Airport to Seattle at least 25 days early can save you up to 29% on average compared to booking a flight this week. If booking 25 days before your flight isn’t an option for you, users have found flights from Washington, D.C. Dulles Intl Airport to Seattle for as little as $490 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $574 for flights departing within the next 3 days.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Seattle?

October is one of the best times of the year to fly to Seattle from Washington, D.C. Dulles Intl Airport. Prices for October average $414 per person but you can even find prices for as low as $197. The most expensive prices can be found in the month of June. Opting for a October flight can save you 62% on your journey compared to booking in June

When is the cheapest time to fly from Washington, D.C. Dulles Intl Airport to Seattle (IAD - SEA)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to Seattle as you normally would.

Cheap flights from Dulles Intl to Seattle in September, October 2022

The best prices found for IAD to SEA flights for September, October
Oct 26 - Nov 9
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 58m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$246

Alaska Airlines

Pick Dates

Deal found 9/26/22

Oct 26 - Oct 26
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 55m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$247

Alaska Airlines

Pick Dates

Deal found 9/26/22

Oct 19 - Oct 25
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 52m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$252

Multiple Airlines

Pick Dates

Deal found 9/26/22

Dulles Intl to Seattle 2022 flight deals

Cheap flights to Seattle from Dulles Intl found for this year
Oct 26 - Nov 9
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 58m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$246

Alaska Airlines

Pick Dates

Deal found 9/26/22

Oct 26 - Oct 26
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 55m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$247

Alaska Airlines

Pick Dates

Deal found 9/26/22

Nov 9 - Nov 16
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 58m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

5h 02m
$252

Multiple Airlines

Pick Dates

Deal found 9/27/22

Cheap Alaska Airlines flights from Dulles Intl to Seattle

Feb 7 - Feb 11
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

6h 00m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 55m
$245

Alaska Airlines

Pick Dates

Deal found 9/27/22

Oct 26 - Nov 9
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 58m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$246

Alaska Airlines

Pick Dates

Deal found 9/26/22

Oct 26 - Oct 26
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 55m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 52m
$247

Alaska Airlines

Pick Dates

Deal found 9/26/22

  • Alaska Airlines is one of the most popular airlines used for those traveling from Washington, D.C. Dulles Intl Airport to Seattle. Flights on this route from Alaska Airlines typically cost $357.20 RT, a price that is 69% cheaper than the average Washington, D.C. Dulles Intl Airport to Seattle flight. The cheapest flight found was $135 RT. Washington, D.C. Dulles Intl Airport is the most common Washington, D.C. Dulles Intl Airport airport to take off from when flying to Seattle. Seattle/Tacoma Intl Airport is the most popular arrival airport in Seattle. When flying from Washington, D.C. Dulles Intl Airport to Seattle, Alaska Airlines flights are 31% more popular than any other airline flying that same route.

Cheap United Airlines flights from Dulles Intl to Seattle

Oct 26 - Oct 29
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 50m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

1 stop

7h 40m
$267

United Airlines

Pick Dates

Deal found 9/29/22

Oct 26 - Oct 29
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

1 stop

8h 47m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

1 stop

8h 04m
$276

United Airlines

Pick Dates

Deal found 9/29/22

Oct 25 - Oct 27
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

1 stop

9h 49m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

Nonstop

4h 55m
$287

United Airlines

Pick Dates

Deal found 9/28/22

  • If you’re traveling from Washington, D.C. Dulles Intl Airport to Seattle, one of the more common airlines traveling that route is United Airlines. Flights from United Airlines traveling this route typically cost $428.60 RT. This price is typically 62% more expensive than other airlines that offer Washington, D.C. Dulles Intl Airport to Seattle flights. When booking this route, the cheapest RT price found was $158. The most popular departure airport in Washington, D.C. Dulles Intl Airport when flying to Seattle is Washington, D.C. Dulles Intl Airport. The most popular airport to fly into when visiting Seattle is Seattle/Tacoma Intl Airport. When flying from Washington, D.C. Dulles Intl Airport to Seattle, United Airlines flights are 30% more popular than any other airline flying that same route.

Last minute flights from Dulles Intl to Seattle

Late deals on return flights to Seattle from Dulles Intl, departing today and this week
Oct 6 - Oct 22
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 55m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

1 stop

9h 53m
$378

Multiple Airlines

Pick Dates

Deal found 9/26/22

Oct 4 - Oct 18
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 50m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

1 stop

8h 48m
$385

United Airlines

Pick Dates

Deal found 9/26/22

Oct 4 - Oct 18
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

1 stop

9h 02m
SEA

Seattle/Tacoma Intl

IAD

Washington, D.C. Dulles Intl

1 stop

8h 48m
$394

United Airlines

Pick Dates

Deal found 9/26/22

One-way flights to Seattle from Dulles Intl

The cheapest one-way flights from Dulles Intl to Seattle
Oct 19
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 55m
$110

Alaska Airlines

Pick Dates

Deal found 9/26/22

Nov 1
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

Nonstop

5h 58m
$129

Alaska Airlines

Pick Dates

Deal found 9/26/22

Oct 30
IAD

Washington, D.C. Dulles Intl

SEA

Seattle/Tacoma Intl

2 stops

34h 59m
$131

Multiple Airlines

Pick Dates

Deal found 9/26/22

Related info for your journey

Useful info, stats and facts about Dulles Intl to Seattle flights.

What airport do you fly into for flights to Seattle from Washington, D.C. Dulles Intl?

Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. Dulles Intl to Seattle. 7 airlines have flights to Seattle/Tacoma Intl from Washington, D.C. Dulles Intl on a regular basis. Booking flights from Washington, D.C. Dulles Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 7 inbound flights from Washington, D.C. Dulles Intl per day.

Which airlines flying from Washington, D.C. Dulles Intl to Seattle/Tacoma Intl have flexible cancellations due to COVID-19?

Alaska Airlines, United Airlines, and Delta are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Washington, D.C. Dulles Intl Airport to Seattle for under $300 on Cheapflights?

Yes, there are multiple flights from Washington, D.C. Dulles Intl Airport to Seattle for under $300. The cheapest flight booked recently is on Alaska Airlines for just $245, but on average you can expect to pay $256.

Are there last-minute flights available from Washington, D.C. Dulles Intl Airport to Seattle for under $400?

There are currently 20+ open flights from Washington, D.C. Dulles Intl Airport to Seattle within the next 7 days for less than $400.

What days are nonstop flights available from Washington, D.C. Dulles Intl Airport to Seattle?

Nonstop flights can be found on the following days: Sunday, Monday, Tuesday, Thursday, Friday.

How many flights depart from Washington, D.C. Dulles Intl Airport to Seattle on average per day?

Per day, 9 flights depart from Washington, D.C. Dulles Intl Airport to Seattle on average.
Morning (6am - Noon) - 33% of flight departures
Evening (6pm - Midnight) - 67% of flight departures

How long is the flight from Washington, D.C. Dulles Intl Airport to Seattle?

There are many flights that can get you from Washington, D.C. Dulles Intl Airport to Seattle in 5h 50m. Fly via Alaska Airlines, United Airlines, or American Airlines to get the fastest option. Airlines will cover a distance of 2313 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Seattle round-trip?

Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to Seattle round-trip from $245. Other airlines that can offer you cheap pricing are United Airlines, from $267, and American Airlines, from $273. Alaska Airlines is currently priced 39% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Seattle one-way?

To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $110. American Airlines flights start at $137 while deals on United Airlines start at $138 one-way.

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Seattle?

When booking a flight from Washington, D.C. Dulles Intl Airport to Seattle, you may want to consider flying on American Airlines, Alaska Airlines or Delta as they are the most popular for this route.

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Seattle?

The top 3 most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Seattle are Japan Airlines (91%), United Airlines (88%) and Alaska Airlines (86%).

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Seattle?

The cheapest flight price from Washington, D.C. Dulles Intl Airport to Seattle is $149. On average you can expect to pay $877. The most popular route, (Washington, D.C. Dulles Intl - Seattle/Tacoma Intl), can usually be booked for $255.

Alternative routes for Dulles Intl to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from Dulles Intl to Seattle

The chart below displays the airlines Cheapflights users traveling from Dulles Intl to Seattle choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Juneyao AirlinesCheapest$16Average$23FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
Alaska AirlinesCheapest$135Average$357FlexibilityNo cancel feeOn-time75%COVID-19 safety
Search Alaska Airlines flights
American AirlinesCheapest$138Average$372FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights
DeltaCheapest$158Average$429FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
United AirlinesCheapest$188Average$490FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights

Hourly flight availability from Dulles Intl to Seattle

See what time of day planes typically take off from Dulles Intl to Seattle
5%of flight departuresEarly morningMidnight to 6 am
21%of flight departuresMorning6 am to noon
67%of flight departuresAfternoonNoon to 6 pm
7%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Dulles Intl to Seattle

See how many times per day planes take to the skies headed from Dulles Intl to Seattle
Sunday6daily flights
Monday5daily flights
Tuesday6daily flights
Wednesday11daily flights
Thursday14daily flights
Friday4daily flights
Saturday5daily flights