$90 Cheap Flights from Baltimore (BWI) to Seattle (SEA)

View $90 flight on Tue, Dec 9, 2025Opens in a new window

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

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Today's featured flight deals from Baltimore Washington Intl. Airport (BWI) to Seattle-Tacoma International Airport (SEA)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Baltimore to Seattle (BWI-SEA)

Prices were available within the past 7 days and start at $90 for one-way flights and $174 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Fri, Dec 5 - Mon, Dec 15
BWI
Baltimore
SEA
Seattle
$174 Roundtrip, found 3 hours ago
$174
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Baltimore to Seattle, returning Mon, Dec 15, priced at $174 found 3 hours ago
American Airlines
Fri, Dec 5 - Mon, Dec 8
BWI
Baltimore
SEA
Seattle
$179 Roundtrip, found 1 hour ago
$179
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Fri, Dec 5 from Baltimore to Seattle, returning Mon, Dec 8, priced at $179 found 1 hour ago
Southwest Airlines
Fri, Dec 5 - Mon, Dec 8
BWI
Baltimore
SEA
Seattle
$179 Roundtrip, found 1 hour ago
$179
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Baltimore to Seattle, returning Mon, Dec 8, priced at $179 found 1 hour ago
Southwest Airlines
Fri, Dec 5 - Mon, Dec 15
BWI
Baltimore
SEA
Seattle
$180 Roundtrip, found 3 hours ago
$180
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Baltimore to Seattle, returning Mon, Dec 15, priced at $180 found 3 hours ago
Southwest Airlines
Fri, Dec 5 - Mon, Dec 8
BWI
Baltimore
SEA
Seattle
$184 Roundtrip, found 1 hour ago
$184
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Baltimore to Seattle, returning Mon, Dec 8, priced at $184 found 1 hour ago
Delta
Mon, Nov 24 - Thu, Dec 4
BWI
Baltimore
SEA
Seattle
$186 Roundtrip, found 3 hours ago
$186
Roundtrip
found 3 hours ago
Select Delta flight, departing Mon, Nov 24 from Baltimore to Seattle, returning Thu, Dec 4, priced at $186 found 3 hours ago
Southwest Airlines
Tue, Nov 18 - Sun, Nov 23
BWI
Baltimore
SEA
Seattle
$188 Roundtrip, found 1 hour ago
$188
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Tue, Nov 18 from Baltimore to Seattle, returning Sun, Nov 23, priced at $188 found 1 hour ago
Delta
Fri, Dec 5 - Mon, Dec 8
BWI
Baltimore
SEA
Seattle
$189 Roundtrip, found 1 hour ago
$189
Roundtrip
found 1 hour ago
Select Delta flight, departing Fri, Dec 5 from Baltimore to Seattle, returning Mon, Dec 8, priced at $189 found 1 hour ago
United
Wed, Nov 26 - Sat, Dec 6
BWI
Baltimore
SEA
Seattle
$204 Roundtrip, found 3 hours ago
$204
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Nov 26 from Baltimore to Seattle, returning Sat, Dec 6, priced at $204 found 3 hours ago
Alaska Airlines
Sat, Dec 6 - Tue, Dec 16
BWI
Baltimore
SEA
Seattle
$215 Roundtrip, found 3 hours ago
$215
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sat, Dec 6 from Baltimore to Seattle, returning Tue, Dec 16, priced at $215 found 3 hours ago

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

February is typically the cheapest month to fly

From $164 - $397 per traveler.

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 center is 20 minutes. Flights from $458
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $458
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, Hawaiian Airlines, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$174
Distance
2328 mi
Average flight time
2 hours 45 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 December. 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 $90 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 a cheap one-way flight from $90 or cheap return flight from $174 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
December is the cheapest month to fly from BWI to SEA. Avoiding peak travel times is often the key to scoring lower fares.
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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline flying from BWI to SEA, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
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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*Available to One Key members.