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CA $195 Cheap Flights from Washington (IAD) to Seattle (SEA)

View CA $195 flight on Wed, Sep 9, 2026Opens in a new window

Popular airlines from Washington Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA)

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Cheap flights from Washington (IAD) to Seattle (SEA)

Prices were available within the past 7 days and start at CA $195 for one-way flights and CA $362 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, Sep 5 - Mon, Sep 14
IAD
Washington
SEA
Seattle
CA $362 Roundtrip, found 11 hours ago
CA $362
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Sat, Sep 5 from Washington to Seattle, returning Mon, Sep 14, priced at CA $362 found 11 hours ago
Delta
Tue, Sep 1 - Tue, Sep 15
IAD
Washington
SEA
Seattle
CA $362 Roundtrip, found 11 hours ago
CA $362
Roundtrip
found 11 hours ago
Select Delta flight, departing Tue, Sep 1 from Washington to Seattle, returning Tue, Sep 15, priced at CA $362 found 11 hours ago
American Airlines
Tue, Sep 15 - Sun, Sep 20
IAD
Washington
SEA
Seattle
CA $390 Roundtrip, found 1 day ago
CA $390
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Sep 15 from Washington to Seattle, returning Sun, Sep 20, priced at CA $390 found 1 day ago
Alaska Airlines
Sun, Aug 23 - Tue, Sep 1
IAD
Washington
SEA
Seattle
CA $404 Roundtrip, found 2 days ago
CA $404
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sun, Aug 23 from Washington to Seattle, returning Tue, Sep 1, priced at CA $404 found 2 days ago
Alaska Airlines
Sat, Sep 5 - Mon, Sep 14
IAD
Washington
SEA
Seattle
CA $407 Roundtrip, found 11 hours ago
CA $407
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Sat, Sep 5 from Washington to Seattle, returning Mon, Sep 14, priced at CA $407 found 11 hours ago
Delta
Tue, Aug 25 - Sat, Aug 29
IAD
Washington
SEA
Seattle
CA $408 Roundtrip, found 4 days ago
CA $408
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Aug 25 from Washington to Seattle, returning Sat, Aug 29, priced at CA $408 found 4 days ago
American Airlines
Fri, Oct 2 - Sun, Oct 4
IAD
Washington
SEA
Seattle
CA $416 Roundtrip, found 22 hours ago
CA $416
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Fri, Oct 2 from Washington to Seattle, returning Sun, Oct 4, priced at CA $416 found 22 hours ago
American Airlines
Sat, Sep 5 - Mon, Sep 14
IAD
Washington
SEA
Seattle
CA $418 Roundtrip, found 11 hours ago
CA $418
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Sat, Sep 5 from Washington to Seattle, returning Mon, Sep 14, priced at CA $418 found 11 hours ago
United
Sat, Sep 5 - Mon, Sep 14
IAD
Washington
SEA
Seattle
CA $532 Roundtrip, found 11 hours ago
CA $532
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Sep 5 from Washington to Seattle, returning Mon, Sep 14, priced at CA $532 found 11 hours ago
Sun Country Airlines
Mon, Jul 20 - Fri, Jul 24
IAD
Washington
SEA
Seattle
CA $814 Roundtrip, found 17 hours ago
CA $814
Roundtrip
found 17 hours ago
Select Sun Country Airlines flight, departing Mon, Jul 20 from Washington to Seattle, returning Fri, Jul 24, priced at CA $814 found 17 hours ago

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from CA $741
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city centre20 min
Flights from CA $741

Frequently asked questions

How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from CA $195 and cheap return flights from CA $362 IAD to SEA with Expedia. One-way flights typically cost between CA$190 and CA$1056. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to SEA ticket fares go up or down.
What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
January is typically the cheapest month to fly from Washington Dulles International Airport (IAD) to Seattle - Tacoma International Airport (SEA), with average return fares around CA$434. January often sees lower prices because it falls after the busy holiday season, when travel demand tends to decrease, leading airlines to offer more competitive fares. Other cheap months to fly from Washington Dulles International Airport (IAD) to Seattle - Tacoma International Airport (SEA) include February and September.
Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
There are 4 airlines offering direct flights from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA). Here are some of the top carriers:
  • United operates 21 direct flights from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA) every week.
  • Delta operates 7 direct flights from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA) every week.
  • Starlux Airlines operates 7 direct flights from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA) every week.
  • Japan Airlines operates 7 direct flights from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA) every week.
How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best airline to fly with from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will differ from traveler to traveler. If you like to fly early, Delta offers early morning flights. If price is the most important factor, Delta typically offers the lowest fares. United offers the most daily flights from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Washington, DC (IAD) to Seattle, WA (SEA)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You'll find around 4 nonstop flights per day from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA). For even more choices, look at flights that include layovers, as there are approximately 122 connecting flights per day. Some common connection points include Hartsfield-Jackson Atlanta Intl. (ATL), Charlotte-Douglas Intl. (CLT), and Denver Intl. (DEN).
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA) typically departs around 5:00 AM. This flight is operated by American Airlines. This is a seasonal service, active in February and March. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You'll typically find the most flights from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) on a Friday, with around 59 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include United, Delta, and Alaska Airlines. Fridays offer notably more flight options compared to other days of the week, making it a good day to find a flight that fits your schedule.
What are the most popular departure times for flights from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Washington Dulles Intl. (IAD) to Seattle - Tacoma Intl. (SEA) are in the morning, from 6am to 9am. Many major carriers, including Alaska Airlines, Delta and United, offer flights during this window. Many travellers prefer these early morning flights as they allow you to arrive at your destination with plenty of time to settle in or start your day.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A nonstop flight from IAD to SEA typically takes around 6 hours, covering approximately 3,701 kilometers. Connecting flights on this route usually add 4 hours to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You can fly business class or first class between IAD and SEA. You can fly business class with Frontier Airlines and Delta.First class cabins are available on Alaska Airlines, United, Delta, and American Airlines.
How do I earn miles on a Washington, DC (IAD) to Seattle, WA (SEA) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD) to Seattle, WA (SEA) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle, WA (SEA) from Washington, DC (IAD)?
If you're planning to travel to Seattle from Washington Dulles Intl. (IAD), you can fly directly into Seattle - Tacoma Intl. (SEA). Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), San Diego Intl. (SAN), or Denver Intl. (DEN) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Washington, DC (IAD) to Seattle, WA (SEA) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD) to Seattle, WA (SEA) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD) to Seattle, WA (SEA) flight and hotel package?
Securing a Washington, DC (IAD) to Seattle, WA (SEA) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Sun Country Airlines
Roundtrip price
CA $362
Distance
3679 km
Average flight time
3 hours 46 mins

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Chantilly to Seattle Flights

The easy way to book your flights from Washington to Seattle 

With Expedia, it’s simple to find and book flights to Seattle from Washington whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Seattle - Tacoma Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Washington to Seattle today, tomorrow, or this week.  

 

Save dollars with cheap flights from Washington Dulles Intl., IAD to Seattle - Tacoma Intl., SEA 

Sort your search results by price to find great deals on your flight from Washington to Seattle—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Seattle from Washington currently is just CA $362 rising to CA $814.  

Here are more money-saving tips: 

  • Fly in September when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Seattle  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Seattle from Washington 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Seattle with Expedia today.

Chantilly to Seattle Flights

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