$104 Cheap Flights from Baltimore (BWI) to Seattle (SEA)

View $104 flight on Thu, Oct 30, 2025Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Baltimore to Seattle (BWI-SEA)

Prices were available within the past 7 days and start at $104 for one-way flights and $207 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Sep 30 - Thu, Oct 2
BWI
Baltimore
SEA
Seattle
$207 Roundtrip, just found
$207
Roundtrip
just found
Select American Airlines flight, departing Tue, Sep 30 from Baltimore to Seattle, returning Thu, Oct 2, priced at $207 just found
Southwest Airlines
Wed, Oct 1 - Fri, Oct 3
BWI
Baltimore
SEA
Seattle
$232 Roundtrip, just found
$232
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Oct 1 from Baltimore to Seattle, returning Fri, Oct 3, priced at $232 just found
Southwest Airlines
Mon, Aug 18 - Wed, Aug 20
BWI
Baltimore
SEA
Seattle
$233 Roundtrip, found 1 hour ago
$233
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Mon, Aug 18 from Baltimore to Seattle, returning Wed, Aug 20, priced at $233 found 1 hour ago
American Airlines
Sun, Aug 24 - Tue, Aug 26
BWI
Baltimore
SEA
Seattle
$235 Roundtrip, found 1 hour ago
$235
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Sun, Aug 24 from Baltimore to Seattle, returning Tue, Aug 26, priced at $235 found 1 hour ago
Southwest Airlines
Tue, Aug 12 - Tue, Aug 19
BWI
Baltimore
SEA
Seattle
$239 Roundtrip, found 4 hours ago
$239
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Tue, Aug 12 from Baltimore to Seattle, returning Tue, Aug 19, priced at $239 found 4 hours ago
Alaska Airlines
Tue, Aug 19 - Thu, Aug 21
BWI
Baltimore
SEA
Seattle
$240 Roundtrip, found 1 hour ago
$240
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Aug 19 from Baltimore to Seattle, returning Thu, Aug 21, priced at $240 found 1 hour ago
Southwest Airlines
Tue, Sep 30 - Thu, Oct 2
BWI
Baltimore
SEA
Seattle
$242 Roundtrip, just found
$242
Roundtrip
just found
Select Southwest Airlines flight, departing Tue, Sep 30 from Baltimore to Seattle, returning Thu, Oct 2, priced at $242 just found
American Airlines
Thu, Aug 21 - Sat, Aug 23
BWI
Baltimore
SEA
Seattle
$243 Roundtrip, found 1 hour ago
$243
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Thu, Aug 21 from Baltimore to Seattle, returning Sat, Aug 23, priced at $243 found 1 hour ago
United
Wed, Aug 20 - Tue, Aug 26
BWI
Baltimore
SEA
Seattle
$245 Roundtrip, found 2 hours ago
$245
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Aug 20 from Baltimore to Seattle, returning Tue, Aug 26, priced at $245 found 2 hours ago
Hawaiian Airlines
Tue, Sep 9 - Tue, Sep 16
BWI
Baltimore
SEA
Seattle
$257 Roundtrip, found 9 hours ago
$257
Roundtrip
found 9 hours ago
Select Hawaiian Airlines flight, departing Tue, Sep 9 from Baltimore to Seattle, returning Tue, Sep 16, priced at $257 found 9 hours ago

Find the cheapest month to fly from Baltimore (BWI) to Seattle (SEA)

September is typically the cheapest month to fly

From $150 - $267 per traveler.

Graph displaying average flight prices per month

Flights from Baltimore (BWI) to Seattle (SEA)
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, Sun Country Airlines, United
Roundtrip price
$206
Distance
2328 mi
Average flight time
3 hours 27 mins

Baltimore to Seattle Flights

The cheapest times to fly from Baltimore to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Baltimore to Seattle are during the month of September. You can find some of the cheapest flights from Baltimore to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Baltimore to Seattle

Sunday is one of the best days to book for cheap flights from Baltimore to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Baltimore to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Baltimore to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $104 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Baltimore to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Baltimore to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA) cost?
Grab cheap return tickets starting at $270 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Alaska Airlines flight leaving BWI on July 15 2025 and touching down at SEA. The price was last updated on June 24 2025 and has not changed since.
What is the cheapest month to fly from BWI to SEA?
The cheapest flights from BWI to SEA are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
If you're departing from Baltimore Washington Intl. Thurgood Marshall Airport (BWI), you can catch a nonstop flight to Seattle - Tacoma Intl. Airport (SEA) with Alaska Airlines.
What is the cheapest airline that flies from BWI to SEA?
Fly from BWI to SEA with Alaska Airlines. This carrier currently has the cheapest one-way fare on this route, starting at $136. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from BWI on September 1 2025. Prices were last updated on June 24 2025 and have not changed since.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
On average, you can pick from 5 direct flights each week from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA). To increase your travel options, consider a flight with a layover. Enter your details on Expedia and then set the filters to include one or two stops.
What are the most popular departure times for flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
The 6 PM departures from BWI to SEA are the most sought after. Prices can be higher for these popular slots. If you're looking to save, choose a less crowded time to fly.
What day of the week has the most flights from BWI to SEA?
If you travel on a Friday, you'll get the widest range of options for flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
Baltimore Washington Intl. Thurgood Marshall Airport (BWI)'s earliest flight to Seattle - Tacoma Intl. Airport (SEA) leaves at approximately 6:59PM UTC-5. With a total travel time of 6h 1m, you'll touch down at around 10:00PM UTC-8.
How long does it take to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
Flights from BWI to SEA have an average travel time of 6 hours and 1 minute. The total distance between the two airports is 2,300 mi.
What airline has the least delays from BWI to SEA?
With 100% of journeys typically arriving as scheduled, Southwest Airlines has the best on-time performance for direct flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA). To check your flight status and get notifications about any changes, head to the Expedia App.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
To touch down at Seattle - Tacoma Intl. Airport (SEA) on time, pick a flight that leaves from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seattle from Baltimore Washington Intl. Thurgood Marshall Airport (BWI)?
Seattle - Tacoma Intl. Airport (SEA) is the only airport in Seattle with direct flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI). Consider the available options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your plane ticket from BWI to SEA right before your getaway is typically more expensive. But if there's some wiggle room with your schedule, you could snag a cheap last-minute fare.
Is it cheaper to book a BWI to SEA flight and hotel package?
Compared with arranging hotels and flights separately, booking a BWI to SEA flight and hotel package with Expedia could result in significant savings. Better yet, having it all in one place will take the hassle out of planning your trip. Simply secure your flights and select from our extensive range of hotels, then customize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
If you reserved your BWI to SEA flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more details.

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