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Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from C$ 205

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
25 feb. — 4 mar.1
1 adult

The best prices from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl are usually found in September or October, booked 52 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Seattle to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 20 febrero 2025.

Round-trip from

C$ 399

One-way from

C$ 205

Popular in

December

Cheapest in

September

Average price

C$ 543

Good round-trip deal

C$ 1,007 or less

Good one-way deal

C$ 958 or less
Delta
  • Delta
  • 28/3-5/4
  • 2 total stops
  • 27h 11m total
  • Seattle to Washington, D.C.
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Hawaiian Airlines
  • Hawaiian Airlines
  • 27/3
  • Nonstop
  • 4h 59m total
  • Seattle to Washington, D.C.
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Highest demand for flights based on searches. 3% potential increase in price (C$ 31 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl.
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Find flight deals from Seattle to Dulles Intl

Cheapest flights from Seattle to Dulles Intl
Explore the most affordable flight options available from Seattle to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 febrero 2025.

vie. 28/312:49 a.m.SEA - IAD
1 stop19h 38mDelta
sáb. 5/46:00 a.m.IAD - SEA
1 stop7h 33mDelta
Deal found 20/2C$ 399
sáb. 26/48:15 a.m.SEA - IAD
Nonstop5h 07mUnited Airlines
jue. 1/55:25 p.m.IAD - SEA
1 stop8h 26mUnited Airlines
Deal found 20/2C$ 409
vie. 11/47:55 p.m.SEA - IAD
1 stop17h 35mAlaska Airlines
mié. 16/47:00 a.m.IAD - SEA
Nonstop5h 52mAlaska Airlines
Deal found 20/2C$ 412
vie. 7/35:00 a.m.SEA - IAD
1 stop6h 50mSouthwest
lun. 17/37:50 p.m.IAD - SEA
1 stop8h 00mSouthwest
Deal found 19/2C$ 415
mar. 1/75:00 p.m.SEA - IAD
1 stop9h 55mHawaiian Airlines
mar. 5/87:00 a.m.IAD - SEA
1 stop9h 52mHawaiian Airlines
Deal found 20/2C$ 477
jue. 24/46:25 p.m.SEA - IAD
1 stop14h 58mSun Country Air
lun. 28/411:37 a.m.IAD - SEA
1 stop8h 22mSun Country Air
Deal found 20/2C$ 490

Find flights from Seattle to Dulles Intl within your budget

Customize your flight search to find flights from Seattle to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 20 febrero 2025.

Fly from

Seattle

Fly to

Dulles Intl

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

vie. 28/3

12:49 a.m.-11:27 p.m.

1 stop19h 38m

Washington, D.C. Dulles Intl

sáb. 5/4

6:00 a.m.-10:33 a.m.

1 stop7h 33m

C$ 399

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

sáb. 26/4

8:15 a.m.-4:22 p.m.

Nonstop5h 07m

Washington, D.C. Dulles Intl

jue. 1/5

5:25 p.m.-10:51 p.m.

1 stop8h 26m

C$ 409

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

vie. 11/4

7:55 p.m.-4:30 p.m.

1 stop17h 35m

Washington, D.C. Dulles Intl

mié. 16/4

7:00 a.m.-9:52 a.m.

Nonstop5h 52m

C$ 412

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

vie. 7/3

5:00 a.m.-2:50 p.m.

1 stop6h 50m

Washington, D.C. Dulles Intl

lun. 17/3

7:50 p.m.-12:50 a.m.

1 stop8h 00m

C$ 415

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

mar. 1/7

5:00 p.m.-5:55 a.m.

1 stop9h 55m

Washington, D.C. Dulles Intl

mar. 5/8

7:00 a.m.-1:52 p.m.

1 stop9h 52m

C$ 477

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

jue. 24/4

6:25 p.m.-12:23 p.m.

1 stop14h 58m

Washington, D.C. Dulles Intl

lun. 28/4

11:37 a.m.-4:59 p.m.

1 stop8h 22m

C$ 490

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

jue. 27/3

10:00 a.m.-5:59 p.m.

Nonstop4h 59m

C$ 205

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

jue. 6/3

7:28 a.m.-3:28 p.m.

Nonstop5h 00m

C$ 212

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

jue. 22/5

10:15 p.m.-6:12 a.m.

Nonstop4h 57m

C$ 216

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

lun. 24/3

4:59 p.m.-5:40 a.m.

1 stop9h 41m

C$ 217

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/2

Showing 1-10 of 13 results
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Best time to book a flight from Seattle to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to Dulles Intl

Get recent, data-driven insights about flights from Seattle to Dulles Intl including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Dulles Intl. Price data was last updated on 14 February 2025.

Booking 35 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Dulles Intl Airport (average of C$ 256). Flying from Seattle to Washington, D.C. Dulles Intl Airport in October is currently the most expensive (average of C$ 352). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to IAD?

Find hourly flight availability from Seattle to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 febrero 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Washington, D.C. Dulles Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 65% on your trip compared to booking a flight in the morning.

Weekly flight availability from Seattle to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Seattle to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 20 febrero 2025.

The most flights from SEA to IAD are scheduled on a Thursday (21 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (9 on average).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 mm per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated 20 febrero 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Seattle to Washington, D.C.. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews
Check prices

Food

7.1

Boarding

8.2

Overall

8.1

Entertainment

7.6

Comfort

8.1

Crew

8.7

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 18.4 km from the centre of Seattle. There are 16 flights from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl per day from 2 different airlines.

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

    Our cheapest airline available from Seattle to Washington, D.C. Dulles Intl Airport is Delta. Our recent data shows that you can find tickets from as low as C$ 399 on this airline. Additional options worth looking into are United Airlines and Alaska Airlines, starting at C$ 409 and C$ 412 round-trip. Delta is 31% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airline one-way is Hawaiian Airlines, with whom users have recently found tickets for as low as C$ 205. However, be on the lookout for offers from Delta and United Airlines, as they are both options that can get you from Seattle to Washington, D.C. Dulles Intl Airport for a low price.

  • 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: China Eastern (90%), Ethiopian Air (90%), Korean Air (89%).

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

    While on average a flight from Seattle to Washington, D.C. Dulles Intl Airport is generally C$ 1,388, our data shows the cheapest flight currently is C$ 535. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay C$ 692 for that flight.

  • Can I find deals for flights from Seattle to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Seattle to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Dulles Intl.

  • Can I find deals for business class flights from Seattle to Dulles Intl?

    Yes. Cheapflights offers flight deals from Seattle to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Washington, D.C. Dulles Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from Seattle to Washington, D.C. Dulles Intl Airport (average of C$ 256). Flying from Seattle to Washington, D.C. Dulles Intl Airport in October is currently the most expensive (average of C$ 352). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Seattle to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Reagan-National flights

Top 2 airlines flying from Seattle to Dulles Intl

Discover the top 2 airlines that operate flights from Seattle to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 20 febrero 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 392AverageC$ 697FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 560AverageC$ 1,219FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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How does Cheapflights help users find flights from Seattle to Dulles Intl?

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Dulles Intl?

Cheapflights helps you find that perfect flight to Dulles Intl from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Seattle to Dulles Intl with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Seattle to Dulles Intl, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Seattle to Dulles Intl become cheaper?

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