Question 1

Which is the best airline for flights from Washington, D.C. to Seattle, Alaska Airlines or Delta?

Accepted Answer

The two airlines most popular with KAYAK users for flights from Washington, D.C. to Seattle are Alaska Airlines and Delta. With an average price for the route of $450 and an overall rating of 7.9, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $372 and an overall rating of 7.8.

Question 2

How long does a flight from Washington Dulles Airport to Seattle take?

Accepted Answer

Direct flights take on average 5h 36m to travel the 2,299 miles between Washington Dulles Airport and Seattle.

Question 3

How many flights are there between Washington, D.C. Dulles Intl Airport and Seattle per day?

Accepted Answer

Each day, there are between 5 and 6 nonstop flights that take off from Washington, D.C. Dulles Intl Airport and land in Seattle, with an average flight time of 5h 44m. The most common departure time is 5:00 pm and most flights take off in the morning. Each week, there are 41 flights. The most frequent day of departure is Monday, when 15% of all weekly flights depart. The fewest flights depart on a Tuesday.

Question 4

How many flights are there between Washington, D.C. Dulles Intl Airport and Seattle per day?

Accepted Answer

Each day, there are between 5 and 6 nonstop flights that take off from Washington, D.C. Dulles Intl Airport and land in Seattle, with an average flight time of 5h 44m. The most common departure time is 5:00 pm and most flights take off in the morning. Each week, there are 41 flights. The most frequent day of departure is Monday, when 15% of all weekly flights depart. The fewest flights depart on a Tuesday.

Question 5

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

Accepted Answer

In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Seattle was $167 for a one-way ticket and $279 for a round-trip.

Question 6

Do I need a passport to fly between Washington Dulles Airport and Seattle?

Accepted Answer

A passport is not required to fly from Washington Dulles Airport to Seattle.

Question 7

Which airlines fly most frequently between Washington Dulles Airport and Seattle?

Accepted Answer

Washington Dulles Airport and Seattle are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (21 flights per week), United Airlines (13 flights per week), and Delta (7 flights per week).

Question 8

Which airlines fly most frequently between Washington Dulles Airport and Seattle?

Accepted Answer

Washington Dulles Airport and Seattle are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (21 flights per week), United Airlines (13 flights per week), and Delta (7 flights per week).

Question 9

What’s the cheapest day of the week to fly from Washington Dulles Airport to Seattle?

Accepted Answer

For Washington Dulles Airport to Seattle, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle back to Washington Dulles Airport, the best deals are generally found on Thursday, with Monday being the most expensive.

Question 10

What’s the cheapest day of the week to fly from Washington Dulles Airport to Seattle?

Accepted Answer

For Washington Dulles Airport to Seattle, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle back to Washington Dulles Airport, the best deals are generally found on Thursday, with Monday being the most expensive.

Question 11

Which airports will I be using when flying from Washington Dulles Airport to Seattle?

Accepted Answer

Washington Dulles Airport and Seattle are both served by 1 main airport. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and will be arriving at Seattle/Tacoma Intl.

Question 12

What’s the earliest departure time from Washington Dulles Airport to Seattle?

Accepted Answer

Early birds can take the earliest flight from Washington, D.C. Dulles Intl Airport at 7:00 am and will be landing in Seattle at 9:37 am.

Question 13

What’s the latest departure time from Washington Dulles Airport to Seattle?

Accepted Answer

If you prefer to fly at night, the latest flight from Washington, D.C. Dulles Intl Airport to Seattle jets off at 6:00 pm and lands at 8:54 pm.

Question 14

Which airlines fly non-stop between Washington, D.C. Dulles Intl Airport and Seattle?

Accepted Answer

There are 5 airlines that fly nonstop from Washington, D.C. Dulles Intl Airport to Seattle. They are: Alaska Airlines, American Airlines, Delta, Hawaiian Airlines and United Airlines. The cheapest price of all airlines flying this route was found with Hawaiian Airlines at $138 for a round-trip flight. On average, the best prices for this route can be found at Hawaiian Airlines.

Question 15

Which airlines fly non-stop between Washington, D.C. Dulles Intl Airport and Seattle?

Accepted Answer

There are 5 airlines that fly nonstop from Washington, D.C. Dulles Intl Airport to Seattle. They are: Alaska Airlines, American Airlines, Delta, Hawaiian Airlines and United Airlines. The cheapest price of all airlines flying this route was found with Hawaiian Airlines at $138 for a round-trip flight. On average, the best prices for this route can be found at Hawaiian Airlines.

Question 16

Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to Seattle?

Accepted Answer

Alaska Airlines, Delta, and JetBlue offer inflight Wi-Fi service on the Washington Dulles Airport to Seattle flight route.

Question 17

Which aircraft models fly most regularly from Washington Dulles Airport to Seattle?

Accepted Answer

The Boeing 737 is the aircraft model that flies most regularly on the Washington Dulles Airport to Seattle flight route.

Question 18

Which airline alliances offer flights from Washington Dulles Airport to Seattle?

Accepted Answer

SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Washington Dulles Airport and Seattle, with SkyTeam being the most commonly used for this route.

Question 19

On which days can I fly direct from Washington Dulles Airport to Seattle?

Accepted Answer

There are nonstop flights from Washington Dulles Airport to Seattle on a daily basis.

Question 20

How can I get from the Sea-Tac Airport (SEA) to my hotel in downtown Seattle?

Accepted Answer

There are a few options to get you from the airport to your hotel in downtown Seattle. One option is the subway system that picks up passengers on the 4th floor of the parking garage. There are a couple of bus services at the Sea-Tac Airport. King County Metro travels to various parts of the city of Seattle while Sound Transit takes passengers to the outlining cities of Bellevue and Renton. The buses pick up by the subway station.

Question 21

Where can I park my car long-term at the Washington Dulles Airport?

Accepted Answer

Very close to the terminal, there is a parking garage and a terminal parking lot. There is also an economy lot a little further away. A shuttle service will take you from the economy lot to the main terminal of the airport.

Question 22

What restaurants are at the Washington Dulles Airport?

Accepted Answer

There are a couple of bars, a pizzeria, and a burger place where you can dine. Some well-known restaurants in this airport include Auntie Anne's, Carrabba's Italian Grill, Chick-Fil-A, and Jersey Mike's Subs.

Question 23

What lounges are at these two airports?

Accepted Answer

Both airports have lounges where you can enjoy some quiet time. These lounges also offer complimentary drinks and snacks. They are sponsored by airlines, credit card companies, or the airport. At the Washington Dulles Airport, there is a United Airlines, British Airways, and an Air France lounge. The Sea-Tac Airport has lounges affiliated with United Airlines, American Express, Delta Airlines, and Alaska Airlines.

Question 24

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

Accepted Answer

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Seattle is January, where tickets cost $231 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $537 and $510 respectively.

Question 25

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

Accepted Answer

The cheapest month for flights from Washington, D.C. Dulles Intl Airport to Seattle is January, where tickets cost $231 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $537 and $510 respectively.

Question 26

How does KAYAK find such low prices on flights from Washington Dulles Airport to Seattle?

Accepted Answer

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington Dulles Airport to Seattle.

Question 27

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington Dulles Airport to Seattle?

Accepted Answer

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Washington Dulles Airport is likely to change within 7 days, so travelers know whether to wait or book now.

Question 28

What is the Hacker Fare option on flights from Washington Dulles Airport to Seattle?

Accepted Answer

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and SEA can sometimes prove cheaper using this method.

Question 29

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington Dulles Airport to Seattle?

Accepted Answer

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Washington Dulles Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Question 30

What is the cheapest layover airport when flying from Washington Dulles Airport to Seattle?

Accepted Answer

Flights via Denver (DEN) offer the most affordable fares, with an average round-trip price of $356.

Question 31

What is the most popular layover airport when flying from Washington Dulles Airport to Seattle?

Accepted Answer

Las Vegas (LAS) is the top choice – 43% of KAYAK users who clicked on 1-stop flights from Washington Dulles Airport to Seattle picked an itinerary connecting there.

Question 32

Which layover airport has the quickest connection when flying from Washington Dulles Airport to Seattle?

Accepted Answer

If you prefer a quick connection, San Francisco (SFO) often has the shortest layovers from Washington Dulles Airport to Seattle, with an average of 0h 58m.

Question 33

Which layover airport offers the shortest total travel time from Washington Dulles Airport to Seattle?

Accepted Answer

Consider flying via Detroit (DTW) for the shortest journey. The average one-way travel time for flights connecting there is 7h 42m.

Question 34

Which cabin class options are there for flights between Washington, D.C. Dulles Intl Airport and Seattle?

Accepted Answer

There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Question 35

Which cabin class options are there for flights between Washington, D.C. Dulles Intl Airport and Seattle?

Accepted Answer

There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Question 36

Which airlines provide the cheapest flights from Washington Dulles Airport to Seattle?

Accepted Answer

In the past 5 days, the cheapest round-trip tickets from Washington Dulles Airport to Seattle were found on Frontier ($279) and Alaska Airlines ($285).

Question 37

Which airlines provide the cheapest flights from Washington Dulles Airport to Seattle?

Accepted Answer

In the past 5 days, the cheapest round-trip tickets from Washington Dulles Airport to Seattle were found on Frontier ($279) and Alaska Airlines ($285).

Question 38

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

Accepted Answer

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Seattle, you should book around 4 weeks before departure, which saves you about 61% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Question 39

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

Accepted Answer

To get a below average price on the flight from Washington, D.C. Dulles Intl Airport to Seattle, you should book around 4 weeks before departure, which saves you about 61% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Question 40

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Seattle?

Accepted Answer

No, with an average price for the route of $406, prices are generally cheapest when you fly direct.

Question 41

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Seattle?

Accepted Answer

No, with an average price for the route of $406, prices are generally cheapest when you fly direct.

Question 42

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Seattle?

Accepted Answer

Flight prices are below average for this route right now.Flights to Seattle from Washington, D.C. Dulles Intl Airport usually cost between $350 and $578 in September.
The lowest price found in the past 5 days was $279 on Frontier (Sep 1-Sep 8).

Question 43

What are the most popular airlines flying to Seattle?

Accepted Answer

The most popular airline among KAYAK users flying to Seattle is Alaska Airlines, followed by United Airlines and Delta.

Low season	January
High season	July
Cheapest flight	$167

IAD - SEA

$167 Find Cheap Flights from Washington Dulles Airport to Seattle - Compare and Save

Everything you should know

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

Recent round-trip flight deals from Dulles Intl to Seattle

Recent one-way flight deals from Dulles Intl to Seattle

Recent last minute flight deals from Dulles Intl to Seattle

Recent direct flight deals from Dulles Intl to Seattle

KAYAK's insights & trends for Dulles Intl to Seattle flights

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Seattle?

What’s the cheapest day of the week to fly from Washington Dulles Airport to Seattle?

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

Can I save money by flying with a layover from Washington, D.C. Dulles Intl Airport to Seattle?

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

Which airlines provide the cheapest flights from Washington Dulles Airport to Seattle?

Which airlines fly most frequently between Washington Dulles Airport and Seattle?

Which airlines fly non-stop between Washington, D.C. Dulles Intl Airport and Seattle?

What is the most popular layover airport when flying from Washington Dulles Airport to Seattle?

What is the cheapest layover airport when flying from Washington Dulles Airport to Seattle?

Which layover airport offers the shortest total travel time from Washington Dulles Airport to Seattle?

Which layover airport has the quickest connection when flying from Washington Dulles Airport to Seattle?

Which cabin class options are there for flights between Washington, D.C. Dulles Intl Airport and Seattle?

How many flights are there between Washington, D.C. Dulles Intl Airport and Seattle per day?

How long does a flight from Washington Dulles Airport to Seattle take?

What’s the earliest departure time from Washington Dulles Airport to Seattle?

What’s the latest departure time from Washington Dulles Airport to Seattle?

Expert advice for your flight from Dulles Intl to Seattle

Good to know

Low season

High season

Cheapest flight

When to book flights from Dulles Intl to Seattle

Flights from Dulles Intl to Seattle: the best tips from KAYAK users' own experiences

FAQs for booking Washington Dulles Airport to Seattle flights

KAYAK’s top tips for finding a cheap flight from Washington, D.C. Dulles Intl Airport to Seattle

Prefer to fly direct from Washington Dulles Airport to Seattle?

Everything you need to know for your flight from Dulles Intl to Seattle

Information on your arrival and departure airports

Cabin class types available on flights to Seattle

Complete your trip to Seattle with a hotel stay or car rental

Find direct flights to and from Dulles Intl and Seattle

Flights to other popular destinations

Flights from domestic origins to Seattle

Choose which airport to fly into in Seattle

Find deals for your return flight