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

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The best prices from Seattle to Washington Dulles Intl are usually found in January or February, booked 49 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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

SEA - IAD
Price
$256 - $397
IAD
Temperature
46.4 - 87.8 °F
IAD
Rainfall
2.5 - 4.4 inches

Popular in

July

High demand for flights, 17% potential price rise

Cheapest in

January

Best time to find cheap flights, 22% potential price drop

Round-trip from

$256

From Seattle to Washington Dulles Intl

One-way from

$139

One-way flight from Seattle to Washington Dulles 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 day to fly round-trip from Seattle to Washington Dulles Intl?

Travelers have found that booking a Tuesday departure is the best way to save up to 25% on the cost of booking your flights compared to booking on days of the week where this route is of high demand.

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

Travelers have found it’s best to book a flight 28 days in advance to save up to 11% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 28 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Seattle to Washington Dulles Intl 1-2 weeks in advance for as low as $252, or $276 for flights within the next 24 hours.

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

February can be a great time to fly to Washington Dulles Intl from Seattle with a flight ticket averaging about $243. Cheapflights users have found deals in the month of February for as cheap as $119. The most expensive prices can be found in the month of December.

When is the cheapest time to fly from Seattle to Washington Dulles Intl (SEA - IAD)?

It’s typically best to fly out from Seattle to Washington Dulles Intl in the afternoon. Doing so could potentially save you 51% on the flight price compared to flying at noon, which is usually more expensive.

Cheap flights from Seattle to Washington Dulles Intl in October, November 2020

The best prices found for SEA to IAD flights for October, November
10 Nov - 18 Nov
$222pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
4 Nov - 18 Nov
$232pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
11 Nov - 18 Nov
$233pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle to Washington Dulles Intl 2020 flight deals

Cheap flights to Washington Dulles Intl from Seattle found for this year
10 Nov - 18 Nov
$222pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
4 Nov - 18 Nov
$232pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
11 Nov - 18 Nov
$233pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to Washington Dulles Intl from Seattle

Save time with Seattle to Washington Dulles Intl direct flight deals
5 Jan - 10 Feb
$257pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
10 Nov - 16 Nov
$277pp
SEA
Seattle/Tacoma Intl
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
17 Nov - 29 Dec
$292pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Washington Dulles Intl

Late deals on round-trip flights to Washington Dulles Intl from Seattle, departing today and this week
31 Oct - 9 Nov
$247pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
31 Oct - 7 Nov
$257pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
31 Oct - 10 Nov
$264pp
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

One-way flights to Washington Dulles Intl from Seattle

The cheapest one-way flights from Seattle to Washington Dulles Intl
7:45 pm - 8:43 am
Delta
1 Stop
9h 58m
SEA - IAD
Delta
$139
Delta
3:00 pm - 12:32 pm
Multiple Airlines
2 Stops
18h 32m
SEA - IAD
Multiple Airlines
$154
FlightNetwork
9:10 am - 12:32 pm
Frontier
2 Stops
24h 22m
SEA - IAD
Frontier
$158
Kiwi.com

Related info for your journey

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

Flight FAQs

From Seattle to Washington Dulles Intl

Are flight prices decreasing from Seattle to Washington Dulles Intl due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Seattle and Washington Dulles Intl for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from Seattle/Tacoma Intl to Washington Dulles Intl to control the spread of COVID-19?

Airlines globally have implemented additional safety measures to accommodate you. Alaska Airlines and Delta are some airlines that have done so. Airline carriers are regularly disinfecting and sanitizing their aircraft. Masks are provided and are mandatory while on board. Pre-flight testing for symptoms and antibodies, alongside socially distanced seating (for a limited time) will work towards keeping travelers safer while flying from Seattle/Tacoma Intl to Washington Dulles Intl. Policies will vary by airline.

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

Due to the rapidly changing circumstances due to COVID-19, airlines like United Airlines, Alaska Airlines, and Delta flying from Seattle/Tacoma Intl to Washington Dulles Intl have implemented new flexible cancellation policies.

Can I find flights from Seattle to Washington Dulles Intl for under $300 on Cheapflights?

Yes, there are multiple flights from Seattle to Washington Dulles Intl for under $300. The cheapest flight booked recently is on United Airlines for just $222, but on average you can expect to pay $246.

Are there nonstop flights from Seattle to Washington Dulles Intl for under $300 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to Washington Dulles Intl under $300. A good price for a nonstop flight from Seattle to Washington Dulles Intl is less than $335.

Are there last-minute flights available from Seattle to Washington Dulles Intl for under $300?

There are currently 20+ open flights from Seattle to Washington Dulles Intl within the next 7 days for less than $300.

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

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

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

On average 1 flight departs from Seattle/Tacoma Intl to Washington Dulles Intl per day.
Morning (6am - Noon) - 100% of flight departures

Does it rain more in Seattle or Washington Dulles Intl?

Seattle will have the same amount of rainfall in 1 compared to Washington Dulles Intl over the next 19 days.

Is Seattle weather warmer or cooler than Washington Dulles Intl?

With an average temperature of 88 °F, peak weather can be found in July. As a traveler, expect to see changes in flight prices during that period. The temperatures in Washington Dulles Intl are hotter than in Seattle.

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

Airlines like United Airlines, American Airlines, and Delta fly from Seattle to Washington Dulles Intl in about 4h 49m. The time it takes to get you to your destination can typically vary by up to 4h 15m. Airlines will cover a distance of 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 Dulles Intl round-trip?

Cheapflights users have booked flights from Seattle to Washington Dulles Intl round-trip from $222. Other airlines that can offer you cheap pricing are American Airlines, from $263, and Delta, from $266. These flights start at 32% lower than the current average price 3 months from now.

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

To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $117. American Airlines flights start at $132 while deals on Delta start at $139 one-way.

Alternative routes for Seattle to Washington Dulles Intl

Destination information for Washington Dulles Intl

Things to know before you go. Useful info for your trip from Seattle to Washington Dulles Intl
Average temperature for October in Washington Dulles Intl
69.8 °F
Avg rainfall for October in Washington Dulles Intl
3.8 ″

Airports servicing Seattle

Airports servicing Washington

Hourly flight availability from Seattle to Washington Dulles Intl

Morning 6 AM to noon 100% of SEA to IAD departures
Early morning Midnight to 6 AM 0% of SEA to IAD departures
Afternoon Noon to 6 PM 0% of SEA to IAD departures
Evening 6 PM to midnight 0% of SEA to IAD departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Washington Dulles Intl
Sunday
5 daily flights
Monday
5 daily flights
Tuesday
5 daily flights
Wednesday
5 daily flights
Thursday
5 daily flights
Friday
2 daily flights
Saturday
5 daily flights