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

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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 2021: compare Dulles Intl to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.
IAD - SEA
Price
$247 - $397
SEA
Temperature
41 - 66.2 °F
SEA
Precipitation
0.7 - 6.6 inches

Popular in

December

High demand for flights, 22% potential price rise

Cheapest in

February

Best time to find cheap flights, 20% potential price drop

Round-trip from

$247

From Washington Dulles Intl to Seattle/Tacoma Intl

One-way from

$177

One-way flight from Washington Dulles Intl to Seattle/Tacoma Intl

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest month to fly from Washington Dulles Intl Airport to Seattle?

February is one of the best times of the year to fly to Seattle from Washington Dulles Intl Airport. Prices for February average $314 per person but you can even find prices for as low as $168. The most expensive prices can be found in the month of December. Opting for a February flight can save you 32% on your journey compared to booking in February

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

Users have found that booking a flight from Washington Dulles Intl Airport to Seattle at least 32 days early can save you up to 50% on average compared to booking a flight this week. If booking 32 days before your flight isn’t an option for you, users have found flights from Washington Dulles Intl Airport to Seattle for as little as $377 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 $461 for flights departing within the next 3 days.

When is the cheapest time to fly from Washington 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 Dulles Intl Airport to Seattle as you normally would.

Cheap flights from Dulles Intl to Seattle in December, January 2022

The best prices found for IAD to SEA flights for December, January
25 Jan - 29 Jan
$137pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl
25 Jan - 1 Feb
$153pp
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl
29 Jan - 1 Feb
$154pp
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
American Airlines
 
1 STOP
IAD
Washington Dulles Intl

Washington Dulles Intl to Seattle 2022 flight deals

Cheap flights to Seattle from Dulles Intl found for this year
15 Dec - 7 Jan
$310pp
IAD
Washington Dulles Intl
Delta
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
IAD
Washington Dulles Intl
15 Dec - 7 Jan
$319pp
IAD
Washington Dulles Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
IAD
Washington Dulles Intl
25 Dec - 5 Jan
$331pp
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl

Non-stop flights to Seattle from Dulles Intl

Save time with Dulles Intl to Seattle direct flight deals
25 Jan - 29 Jan
$137pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl
12 Jan - 19 Jan
$177pp
IAD
Washington Dulles Intl
Delta
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
IAD
Washington Dulles Intl
25 Jan - 30 Jan
$197pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl

Last minute flights from Dulles Intl to Seattle

Late deals on round-trip flights to Seattle from Dulles Intl, departing today and this week
15 Dec - 7 Jan
$310pp
IAD
Washington Dulles Intl
Delta
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
IAD
Washington Dulles Intl
15 Dec - 7 Jan
$319pp
IAD
Washington Dulles Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
IAD
Washington Dulles Intl
15 Dec - 24 Jan
$341pp
IAD
Washington Dulles Intl
United Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl

One-way flights to Seattle/Tacoma Intl from Washington Dulles Intl

The cheapest one-way flights from Dulles Intl to Seattle
9:42 am - 6:44 pm
American Airlines
1 Stop
12h 02m
IAD - SEA
American Airlines
1:20 pm - 9:55 am
Alaska Airlines
2 Stops
23h 35m
IAD - SEA
Alaska Airlines
3:59 pm - 7:14 pm
Multiple Airlines
3 Stops
30h 15m
IAD - SEA
Multiple Airlines
$210
Kiwi.com

Related info for your journey

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

Flight FAQs

From Dulles Intl to Seattle

What airport do you fly into for flights to Seattle from Washington 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 Dulles Intl to Seattle. 8 airlines have flights to Seattle/Tacoma Intl from Washington Dulles Intl on a regular basis. Booking flights from Washington Dulles Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 10 inbound flights from Washington Dulles Intl per day.

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

United Airlines, Alaska 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 Dulles Intl Airport to Seattle for under $200 on Cheapflights?

Yes, there are multiple flights from Washington Dulles Intl Airport to Seattle for under $200. The cheapest flight booked recently is on United Airlines for just $137, but on average you can expect to pay $181.

Are there nonstop flights from Washington Dulles Intl Airport to Seattle for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Washington Dulles Intl Airport to Seattle under $200. A good price for a nonstop flight from Washington Dulles Intl Airport to Seattle is less than $266.

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

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

What days are nonstop flights available from Washington Dulles Intl Airport to Seattle?

Days when nonstop flights are available for this flight are: Sunday, Tuesday, Wednesday, Thursday, Friday, Saturday.

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

On average 17 flights depart from Washington Dulles Intl Airport to Seattle per day.
Afternoon (Noon - 6pm) - 47% of flight departures
Evening (6pm - Midnight) - 53% of flight departures

How long is the flight from Washington Dulles Intl Airport to Seattle?

United Airlines, American Airlines, and Delta can get you from Washington Dulles Intl Airport to Seattle in just under 5h 55m. Your travel time can differ by up to 3h 07m. Airlines will cover a distance of 2313 mi. This flight may include one or multiple stops.

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

Currently priced at $137, United Airlines will fly you from Washington Dulles Intl Airport to Seattle and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Delta - these airlines can fly you to your destination from $168 and $177, respectively. United Airlines is currently priced 55% below the average price you’ll pay for this route.

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

One-way options have recently been found by users for as low as $69 on United Airlines. Other airlines that offer cheap prices include Alaska Airlines from $113 and American Airlines from $136 one-way.

What are the most reliable airlines from Washington Dulles Intl Airport to Seattle?

The top 3 most reliable airlines when flying from Washington Dulles Intl Airport to Seattle are United Airlines (92%), China Eastern (92%) and KLM (92%).

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

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

What are the cheapest flights from Washington Dulles Intl Airport to Seattle?

The cheapest flight price from Washington Dulles Intl Airport to Seattle is $128. On average you can expect to pay $573. The most popular route, (Washington Dulles Intl - Seattle/Tacoma Intl), can usually be booked for $252.

COVID Restrictions

View COVID Travel Restrictions for Seattle, WA

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

Information is based on travel restrictions for travel to Seattle/Tacoma Intl within the United States

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

COVID-19 testing requirements
Visitors from Washington Dulles Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Seattle/Tacoma Intl.

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

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

Returning to Washington Dulles Intl from Seattle/Tacoma Intl

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Washington Dulles Intl.

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

Hide COVID Travel Restrictions for Seattle, WA

Alternative routes for Dulles Intl to Seattle

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

Destination information for Seattle

Things to know before you go - useful duration and weather info for your trip from Dulles Intl to Seattle.
Flight duration from Washington Dulles Intl to SEA
5h 29m
Average temperature for December in Seattle
46.4 °F
Avg rainfall for December in Seattle
5.3 ″

Airports servicing Washington

Airports servicing Seattle

Top 7 airlines flying from Washington Dulles Intl to Seattle/Tacoma Intl

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.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Delta
$123 $306 No cancel fee N/A
Alaska Airlines
$126 $313 No cancel fee 75%
Frontier
$134 $250 No cancel fee 62%
Spirit Airlines
$137 $267 No cancel fee 65%
American Airlines
$138 $388 No cancel fee 71%
Sun Country Air
$151 $290 No cancel fee 83%
United Airlines
$158 $399 No cancel fee 69%

Hourly flight availability from Dulles Intl to Seattle

See what time of day planes typically take off from Dulles Intl towards Seattle.
Afternoon Noon to 6 PM 81% of IAD to SEA departures
Evening 6 PM to midnight 18% of IAD to SEA departures
Early morning Midnight to 6 AM 1% of IAD to SEA departures
Morning 6 AM to noon 0% of IAD to SEA departures
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.
Sunday
11 daily flights
Monday
11 daily flights
Tuesday
10 daily flights
Wednesday
10 daily flights
Thursday
10 daily flights
Friday
11 daily flights
Saturday
9 daily flights
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