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Cheap flights from Washington, D.C. Dulles Intl Airport to Seattle from £110

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 18/2. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SEA
25 Nov — 2 Dec1
1 adult

Cheap flight deals from Dulles Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Seattle (SEA). 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 November 2024.

Round-trip from

£203

One-way from

£110

Popular in

June

Cheapest in

January
United Airlines
  • United Airlines
  • 8/1-11/1
  • Nonstop
  • 11h 07m total
  • Washington, D.C. to Seattle
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 18/2
  • Nonstop
  • 5h 56m total
  • Washington, D.C. to Seattle
Search Deals
High demand for flights, 17% potential price rise
Search Deals
Best time to find cheap flights, 13% potential price drop
Search Deals

Find flight deals from Dulles Intl to Seattle

Cheapest flights from Dulles Intl to Seattle
Explore the most affordable flight options available from Dulles Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 November 2024.

Tue 10/1209:13IAD - SEA
1 stop10h 46mAlaska Airlines
Wed 11/1208:40SEA - IAD
1 stop10h 03mAlaska Airlines
Deal found 18/11£218
Thu 12/1206:30IAD - SEA
1 stop9h 28mUnited Airlines
Tue 17/1211:56SEA - IAD
1 stop8h 03mUnited Airlines
Deal found 18/11£230
Wed 11/1218:20IAD - SEA
Nonstop6h 10mDelta
Thu 12/1209:25SEA - IAD
Nonstop5h 00mDelta
Deal found 20/11£234
Fri 13/1206:45IAD - SEA
2 stops15h 40mSouthwest
Tue 17/1206:50SEA - IAD
2 stops13h 10mSouthwest
Deal found 18/11£360
Thu 21/1111:47IAD - SEA
1 stop24h 28mSun Country Air
Mon 25/1118:30SEA - IAD
1 stop14h 09mSun Country Air
Deal found 18/11£363

Find flights from Dulles Intl to Seattle within your budget

Customise your flight search to find flights from Dulles Intl to Seattle 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 953,013 searches. Data last updated 20 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 8/1

17:30-20:31

Nonstop6h 01m

Seattle/Tacoma Intl

Sat 11/1

08:00-16:06

Nonstop5h 06m

£203

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 29/1

18:57-22:00

Nonstop6h 03m

Seattle/Tacoma Intl

Sun 2/2

09:54-17:57

Nonstop5h 03m

£215

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 25/1

16:20-19:20

Nonstop6h 00m

Seattle/Tacoma Intl

Wed 29/1

07:25-15:25

Nonstop5h 00m

£219

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Mon 3/2

17:50-22:40

1 stop7h 50m

Seattle/Tacoma Intl

Wed 5/2

07:00-23:05

2 stops13h 05m

£285

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 18/2

07:00-09:56

Nonstop5h 56m

£110

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Mon 17/2

17:19-20:19

Nonstop6h 00m

£114

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 16/1

16:20-19:20

Nonstop6h 00m

£118

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sun 2/2

06:55-17:25

2 stops13h 30m

£144

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Wed 27/11

12:47-17:28

1 stop7h 41m

£231

Flights are sorted by cheapest return flights first.

Deals found on 20/11

Best time to book a flight from Dulles Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Dulles Intl with our price prediction graph.
Estimated return 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 Dulles Intl to Seattle

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

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

Use this chart to determine the optimal time to book a return flight from Dulles Intl to Seattle. Price data was last updated on 15 November 2024.

The best time to book flights from Washington, D.C. Dulles Intl Airport to Seattle is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Seattle (average of £616). Flying from Washington, D.C. Dulles Intl Airport to Seattle in July is currently the most expensive (average of £841). 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 IAD to SEA?

Find hourly flight availability from Dulles Intl to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 November 2024.

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

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

Explore weekly flight availability from Dulles Intl to Seattle. 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 November 2024.

The most flights from IAD to SEA are scheduled on a Wednesday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

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

If weather is an important factor for your trip to Seattle, 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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 20 November 2024.
See what other customers who have flown with Delta, Southwest and Alaska Airlines from Washington, D.C. to Seattle have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very Good
5,015 reviews
Check prices

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Comfort

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very Good
5,015 reviews
Southwest
8.1
Very Good
5,015 reviews
Check prices

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Comfort

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very Good
9,458 reviews
Southwest
8.1
Very Good
5,015 reviews
Check prices

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Comfort

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very Good
8,758 reviews
Southwest
8.1
Very Good
5,015 reviews
Check prices

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Comfort

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,172 reviews
Southwest
8.1
Very Good
5,015 reviews
Check prices

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Comfort

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Sun Country Air
7.0
Good
416 reviews
Southwest
8.1
Very Good
5,015 reviews
Check prices

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Comfort

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Seattle. 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 into for flights to Seattle from Washington, D.C. Dulles Intl?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from Washington, D.C. Dulles Intl. Booking flights from Washington, D.C. Dulles Intl to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 17 daily inbound flights from Washington, D.C. Dulles Intl from 0 different airlines.

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

    Our cheapest airline available from Washington, D.C. Dulles Intl Airport to Seattle is United Airlines. Our recent data shows that you can find tickets from as low as £203 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at £215 and £219 round-trip. United Airlines is 35% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airline one-way is Alaska Airlines, with whom users have recently found tickets for as low as £110. However, be on the lookout for offers from United Airlines and Delta, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to Seattle for a low price.

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

    The top 3 most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Seattle are Singapore Airlines (100%), Air Tahiti Nui (95%) and Japan Airlines (93%).

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

    Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Seattle? While on average our users pay £214, our data indicates the cheapest price to be £148. The most popular route (Washington, D.C. Dulles Intl - Seattle/Tacoma Intl), is priced around £294.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Seattle 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 Washington, D.C. Dulles Intl Airport to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Seattle (average of £616). Flying from Washington, D.C. Dulles Intl Airport to Seattle in July is currently the most expensive (average of £841). 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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Can Cheapflights find flights from Dulles Intl to Seattle with no change fees?

Need flexible booking options for your flight to Seattle from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Dulles Intl to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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