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

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

All the information you need to plan the best SEA to IAD flight in 2022: compare Seattle to Dulles Intl flight prices with the expected peak season, weather and rainfall in Dulles Intl.
SEA - IAD
Price
$197 - $633
IAD
Temperature
35.6 - 80.6 °F
IAD
Rainfall
2.6 - 4 inches

Popular in

June

High demand for flights, 46% potential price rise

Cheapest in

February

Best time to find cheap flights, 42% potential price drop

Round-trip from

$197

From Seattle/Tacoma Intl to Washington, D.C. Dulles Intl

One-way from

$179

One-way flight from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
How far in advance should I book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

To save on the cost of your flight from Seattle to Washington, D.C. Dulles Intl Airport, book at least 59 days before your planned departure. Booking around this time can save you about 37% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $464 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $477.

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

February can be a great time to fly to Washington, D.C. Dulles Intl Airport from Seattle with a flight ticket averaging about $399. Cheapflights users have found deals in the month of February for as cheap as $185. The most expensive prices can be found in the month of June.

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

When flying from Seattle to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

The best prices found for SEA to IAD flights for August, September
21 Sep - 27 Sep
$342pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
31 Aug - 7 Sep
$357pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Delta
Non-Stop
SEA
Seattle/Tacoma Intl
25 Aug - 30 Aug
$358pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Seattle/Tacoma Intl to Dulles Intl 2022 flight deals

Cheap flights to Dulles Intl from Seattle found for this year
21 Sep - 27 Sep
$342pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Oct - 12 Oct
$357pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
25 Aug - 30 Aug
$358pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Cheap Alaska Airlines flights from Seattle to Dulles Intl

3 Oct - 12 Oct
$357pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
25 Aug - 30 Aug
$358pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
4 Nov - 10 Nov
$360pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Cheap American Airlines flights from Seattle to Dulles Intl

9 Nov - 15 Nov
$373pp
SEA
Seattle/Tacoma Intl
American Airlines
 
1 STOP
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
American Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
9 Nov - 15 Nov
$377pp
SEA
Seattle/Tacoma Intl
American Airlines
 
1 STOP
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
American Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl

Non-stop flights to Dulles Intl from Seattle

Save time with Seattle to Dulles Intl direct flight deals
3 Oct - 12 Oct
$357pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
25 Aug - 30 Aug
$358pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
4 Nov - 10 Nov
$360pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Dulles Intl

Late deals on round-trip flights to Dulles Intl from Seattle, departing today and this week
11 Aug - 21 Aug
$478pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
10 Aug - 29 Aug
$480pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
10 Aug - 23 Aug
$487pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
IAD
Washington, D.C. Dulles Intl
IAD
Washington, D.C. Dulles Intl
Delta
Non-Stop
SEA
Seattle/Tacoma Intl

One-way flights to Dulles Intl from Seattle

The cheapest one-way flights from Seattle to Dulles Intl
12:00 pm - 7:59 pm
Alaska Airlines
Nonstop
4h 59m
SEA - IAD
Alaska Airlines
6:46 am - 6:33 pm
American Airlines
1 Stop
8h 47m
SEA - IAD
American Airlines
2:00 am - 6:07 am
Multiple Airlines
2 Stops
25h 07m
SEA - IAD
Multiple Airlines
$206
Kiwi.com

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Seattle</span> to <span class="emphasized">Dulles Intl</span> flights.

Flight FAQs

From Seattle to Dulles Intl

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

If you book a flight to Washington, D.C. Dulles Intl from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 12 flights from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl per day from 7 different airlines.

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

Some of our airline partners flying from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl have new flexible policies in place due to COVID-19. Alaska Airlines, United Airlines, and Delta are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Alaska Airlines with this kind of flexibility.

Can I find flights from Seattle to Washington, D.C. Dulles Intl Airport for under $400 on Cheapflights?

Yes, there are multiple flights from Seattle to Washington, D.C. Dulles Intl Airport for under $400. The cheapest flight booked recently is on Multiple Airlines for just $342, but on average you can expect to pay $367.

Are there nonstop flights from Seattle to Washington, D.C. Dulles Intl Airport for under $400 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to Washington, D.C. Dulles Intl Airport under $400. A good price for a nonstop flight from Seattle to Washington, D.C. Dulles Intl Airport is less than $388.

Are there last-minute flights available from Seattle to Washington, D.C. Dulles Intl Airport for under $500?

There are currently 20+ open flights from Seattle to Washington, D.C. Dulles Intl Airport within the next 7 days for less than $500.

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

Nonstop flights can be found on the following days: Tuesday, Wednesday, Thursday, Saturday.

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

Per day, 5 flights depart from Seattle to Washington, D.C. Dulles Intl Airport on average.
Morning (6am - Noon) - 40% of flight departures
Afternoon (Noon - 6pm) - 20% of flight departures
Evening (6pm - Midnight) - 40% of flight departures

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

Airlines like Alaska Airlines, American Airlines, and United Airlines fly from Seattle to Washington, D.C. Dulles Intl Airport in about 4h 58m. The time it takes to get you to your destination can typically vary by up to 4h 06m. The distance between Seattle and Washington, D.C. Dulles Intl Airport is about 2313 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Alaska Airlines, at $357, was found to be the cheapest airline from Seattle to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include American Airlines and United Airlines.

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

The cheapest airlines for a one-way flight from Seattle to Washington, D.C. Dulles Intl Airport are Alaska Airlines ($169), United Airlines ($183), and American Airlines ($187).

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

Looking at all options, your cheapest flight can be booked for $172. While the most popular route (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl) can be booked for $356 on average our data indicates $1,139 when flying from Seattle to Washington, D.C. Dulles Intl Airport.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Washington, D.C. Dulles Intl Airport on time: ANA (100%), Singapore Airlines (100%), Qatar Airways (94%).

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

The most popular airlines flying from Seattle to Washington, D.C. Dulles Intl Airport are American Airlines, Alaska Airlines and Delta. Something to consider prior to booking your flight.

COVID Restrictions

View COVID Travel Restrictions for Dulles Intl (IAD)

Do I need a COVID test to fly to Dulles Intl from Seattle?

Information is based on travel restrictions for travel to Washington, D.C. Dulles Intl within the United States

Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter Washington, D.C. Dulles Intl.

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl are not required to present a negative COVID-19 PCR test or antigen result upon entering Washington, D.C. Dulles Intl.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Washington, D.C. Dulles Intl.

Do I need a test to fly back to Seattle from Dulles Intl?

Returning to Seattle/Tacoma Intl from Washington, D.C. Dulles Intl

COVID-19 testing requirements
Visitors from Washington, D.C. Dulles Intl are not required to present a negative COVID-19 PCR test or antigen result upon entering Seattle/Tacoma Intl.

Quarantine requirements
Visitors from Washington, D.C. Dulles Intl are not required to quarantine after entering Seattle/Tacoma Intl.

Hide COVID Travel Restrictions for Dulles Intl (IAD)

Alternative routes for Seattle to Dulles Intl

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

Top 7 airlines flying from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl

The chart below displays the airlines Cheapflights users traveling from Seattle to Dulles Intl choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Juneyao Airlines
$14 $20 No cancel fee 66%

We couldn't confirm the COVID-19 safety measures taken by Juneyao Airlines. Please check directly on their website for additional information.

Alaska Airlines
$119 $325 No cancel fee 75%
Sun Country Air
$126 $259 No cancel fee 83%
American Airlines
$136 $693 No cancel fee 71%
Delta
$138 $376 No cancel fee N/A
United Airlines
$138 $396 No cancel fee 69%
Frontier
$199 $506 No cancel fee 62%

Hourly flight availability from Seattle to Dulles Intl

See what time of day planes typically take off from Seattle towards Dulles Intl.
Afternoon Noon to 6 PM 54% of SEA to IAD departures
Evening 6 PM to midnight 29% of SEA to IAD departures
Morning 6 AM to noon 16% of SEA to IAD departures
Early morning Midnight to 6 AM 1% of SEA to IAD departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Dulles Intl
See how many times per day planes take to the skies headed from Seattle to Dulles Intl.
Sunday
13 daily flights
Monday
13 daily flights
Tuesday
11 daily flights
Wednesday
12 daily flights
Thursday
11 daily flights
Friday
9 daily flights
Saturday
15 daily flights