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Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from C$ 207

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 24/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — IAD
26 Jan — 2 Feb1
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 Monday or Thursday and return on a Monday

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 21 January 2025.

Round-trip from

C$ 406

One-way from

C$ 207

Popular in

December

Cheapest in

September

Average price

C$ 567
Delta
  • Delta
  • 11/2-16/2
  • Nonstop
  • 11h 01m total
  • Seattle to Washington, D.C.
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Delta
  • Delta
  • 24/2
  • Nonstop
  • 5h 00m total
  • Seattle to Washington, D.C.
Search Deals
High demand for flights, 4% potential price rise
Search Deals
Best time to find cheap flights, 2% potential price drop
Search Deals
Average for round-trip flights in January 2025
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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 21 January 2025.

Tue 11/27:10 a.m.SEA - IAD
Nonstop5h 00mDelta
Sun 16/24:23 p.m.IAD - SEA
Nonstop6h 01mDelta
Deal found 20/1C$ 406
Thu 6/39:40 p.m.SEA - IAD
Nonstop4h 52mAlaska Airlines
Thu 13/37:00 a.m.IAD - SEA
Nonstop5h 56mAlaska Airlines
Deal found 20/1C$ 413
Thu 13/38:10 a.m.SEA - IAD
Nonstop4h 59mUnited Airlines
Wed 19/35:25 p.m.IAD - SEA
Nonstop5h 59mUnited Airlines
Deal found 20/1C$ 423
Wed 26/29:10 a.m.SEA - IAD
2 stops10h 55mSouthwest
Wed 5/33:55 p.m.IAD - SEA
1 stop9h 35mSouthwest
Deal found 19/1C$ 507
Wed 18/66:40 p.m.SEA - IAD
1 stop14h 03mSun Country Air
Thu 3/712:40 p.m.IAD - SEA
1 stop22h 22mSun Country Air
Deal found 20/1C$ 561
Sun 9/21:43 p.m.SEA - IAD
1 stop7h 15mAmerican Airlines
Wed 12/26:22 a.m.IAD - SEA
2 stops16h 42mAmerican Airlines
Deal found 20/1C$ 691

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 21 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 11/2

7:10 a.m.-3:10 p.m.

Nonstop5h 00m

Washington, D.C. Dulles Intl

Sun 16/2

4:23 p.m.-7:24 p.m.

Nonstop6h 01m

C$ 406

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 6/3

9:40 p.m.-5:32 a.m.

Nonstop4h 52m

Washington, D.C. Dulles Intl

Thu 13/3

7:00 a.m.-9:56 a.m.

Nonstop5h 56m

C$ 413

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 13/3

8:10 a.m.-4:09 p.m.

Nonstop4h 59m

Washington, D.C. Dulles Intl

Wed 19/3

5:25 p.m.-8:24 p.m.

Nonstop5h 59m

C$ 423

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 26/2

9:10 a.m.-11:05 p.m.

2 stops10h 55m

Washington, D.C. Dulles Intl

Wed 5/3

3:55 p.m.-10:30 p.m.

1 stop9h 35m

C$ 507

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 18/6

6:40 p.m.-11:43 a.m.

1 stop14h 03m

Washington, D.C. Dulles Intl

Wed 2/7

12:40 p.m.-10:44 p.m.

1 stop13h 04m

C$ 561

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sun 9/2

1:43 p.m.-11:58 p.m.

1 stop7h 15m

Washington, D.C. Dulles Intl

Wed 12/2

6:22 a.m.-8:04 p.m.

2 stops16h 42m

C$ 691

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 24/2

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

Nonstop5h 00m

C$ 207

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 5/3

5:22 a.m.-4:12 p.m.

1 stop7h 50m

C$ 213

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 23/4

9:00 a.m.-9:14 p.m.

1 stop9h 14m

C$ 215

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 21/2

5:30 a.m.-5:05 p.m.

1 stop8h 35m

C$ 222

Flights are sorted by cheapest round-trip flights first.

Deals found on 21/1

Showing 1-10 of 12 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 17 January 2025.

Booking 52 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 21 January 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 37% on your trip compared to booking a flight in the evening.

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 21 January 2025.

The most flights from SEA to IAD are scheduled on a Thursday (21 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (13 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 21 January 2025.
Read reviews from past customers who have flown Delta, Alaska Airlines and United Airlines 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
4,659 reviews
Check prices

Food

7.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews
Check prices

Food

7.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,696 reviews
Southwest
8.1
Very good
4,659 reviews
Check prices

Food

7.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,659 reviews
Check prices

Food

7.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,982 reviews
Southwest
8.1
Very good
4,659 reviews
Check prices

Food

7.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews
Check prices

Food

7.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 15 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$ 406 on this airline. Additional options worth looking into are Alaska Airlines and United Airlines, starting at C$ 413 and C$ 423 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 Delta, with whom users have recently found tickets for as low as C$ 207. However, be on the lookout for offers from American Airlines 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: Copa Airlines (89%), Korean Air (88%), Brussels Airlines (88%).

  • 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$ 1,407, our data shows the cheapest flight currently is C$ 398. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay C$ 815 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 21 January 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 397AverageC$ 707FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 618AverageC$ 1,235FlexibilityNo 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.

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