Question 1

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

Accepted Answer

Our cheapest airline available from Seattle to Washington, D.C. Dulles Intl Airport is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 395 on this airline. Additional options worth looking into are Delta and United Airlines, starting at C$ 397 and C$ 418 round-trip. Alaska Airlines is 32% cheaper than the average price of flights available within the next 90 days to this destination.

Question 2

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

Accepted Answer

The cheapest airline one-way is Hawaiian Airlines, with whom users have recently found tickets for as low as C$ 206. However, be on the lookout for offers from Alaska 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.

Question 3

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

Accepted Answer

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.

Question 4

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

Accepted Answer

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.

Question 5

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

Accepted Answer

Travelers seeking maximum savings on their Seattle to Washington, D.C. Dulles Intl Airport flight should consider departing on Monday evenings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Question 6

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

Accepted Answer

The most flights from SEA to IAD are scheduled on a Monday (19 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (13 on average).

Question 7

E

Accepted Answer

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.

Question 8

E

Accepted Answer

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).

Question 9

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

Accepted Answer

While on average a flight from Seattle to Washington, D.C. Dulles Intl Airport is generally C$ 686, our data shows the cheapest flight currently is C$ 205. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay C$ 689 for that flight.

Question 10

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

Accepted Answer

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: Korean Air (100%), Avianca (96%), Ethiopian Air (93%).

Question 11

What is the cheapest day to fly round-trip from Seattle to Washington, D.C. Dulles Intl Airport?

Accepted Answer

Travellers have found that booking a Wednesday departure is the best way to save up to 68% on the cost of booking your flights compared to booking on days of the week where this route is of high demand.

Question 12

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

Accepted Answer

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 42 days in advance, which can save you up to 90% on flights from Seattle to Washington, D.C. Dulles Intl Airport compared to booking the week you need them. Waiting 42 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 526. For sooner than that we have options available in the next 3 days from C$ 798.

Question 13

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

Accepted Answer

September is one of the best times of the year to fly to Washington, D.C. Dulles Intl Airport from Seattle. Prices for September average C$ 582 per person but you can even find prices for as low as C$ 258. The most expensive prices can be found in the month of December. Opting for a September flight can save you 27% on your journey compared to booking in December

Question 14

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

Accepted Answer

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.

Question 15

What airport do you fly from for flights from Seattle to Washington, D.C. Dulles Intl?

Accepted Answer

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 1 airline.

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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.

Question 18

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

Accepted Answer

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.

Question 19

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

Accepted Answer

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Dulles Intl from Seattle today with Cheapflights!

Question 20

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

Accepted Answer

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!

Question 21

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

Accepted Answer

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.

Question 22

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

Accepted Answer

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

Round-trip from	C$ 395
One-way from	C$ 206
Popular in	December
Cheapest in	February
Average price	C$ 600
Good round-trip deal	C$ 411 or less

Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from C$ 206

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 28/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl are usually found in February or September, booked 36 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

Cheap flight deals from Seattle to Dulles Intl

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Find flight deals from Seattle to Dulles Intl

Cheapest flights from Seattle to Dulles IntlExplore 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 25 mars 2025.

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 25 mars 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. Dulles Intl Airport that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Washington, D.C. Dulles Intl Airport

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 21 March 2025.

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

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 25 mars 2025.

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 25 mars 2025.

Rainfall in Dulles Intl by month

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

Temperature in Dulles Intl by month

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

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown Alaska Airlines, Southwest 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.

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?

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

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

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

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

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

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

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

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

Travelling to a place near Seattle?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Seattle to Dulles Intl

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 25 mars 2025.