BWI to SEA Flights: Find the Best Deals to the Pacific Northwest
Cheapest flight found
$160
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the Jun 4, 2026 departure — the cheapest date we found.
Price Behavior: BWI → SEA
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$160
Highest Fare
$269
Median Fare
$210
Price Spread
$109
Prices vary significantly — hourly tracking is especially valuable here.
Cheapest month to fly: June 2026 (from $160)
Most expensive month: September 2026 (from $269)
Biggest price drop caught: $79 between consecutive checks
Most frequent cheapest airline: United
What This Means for You
Flights from Baltimore to Seattle range from $160 to $269, a $109 spread across the months we track. If your dates are flexible, June 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up hourly price alerts gives you the best chance of catching a short-lived drop before it corrects. We have caught drops as large as $79 between hourly checks on this route.
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From
Baltimore (BWI)
To
Seattle (SEA)
Airport Information
Baltimore (BWI)
Baltimore/Washington International Thurgood Marshall Airport (BWI) serves as a major gateway for the Maryland and D.C. metropolitan areas. It is widely recognized for its easy accessibility via the MARC and Amtrak trains, as well as its relatively lower congestion compared to nearby Dulles or Reagan National. Travelers can enjoy a wide variety of local dining options, including authentic Maryland crab cakes, while navigating its efficient five-concourse layout designed for passenger comfort.
Seattle (SEA)
Seattle-Tacoma International Airport (SEA), commonly known as Sea-Tac, is the primary international gateway to the Pacific Northwest and a major hub for both Alaska Airlines and Delta Air Lines. Located about 14 miles south of downtown Seattle, the airport features state-of-the-art facilities, including the recently renovated North Satellite and an impressive Central Terminal with massive floor-to-ceiling windows. Transportation into the city is convenient via the Link Light Rail, which provides a direct and affordable connection to the downtown core.
Frequently Asked Questions
How long is the flight from BWI to SEA?
A non-stop flight typically takes between 5 hours and 45 minutes to 6 hours and 15 minutes, depending on wind speeds and air traffic control.
Which airlines offer direct flights on this route?
Southwest Airlines and Alaska Airlines are the primary carriers offering non-stop service between Baltimore and Seattle, though other major carriers offer one-stop connections.
What is the time difference between Baltimore and Seattle?
Seattle is in the Pacific Time Zone, which is three hours behind Baltimore's Eastern Time Zone, so remember to adjust your watches accordingly.
Is there a train from Sea-Tac to downtown Seattle?
Yes, the Sound Transit Link Light Rail runs frequently from the airport station to various stops in downtown Seattle, taking approximately 40 minutes.
What is the best time to book a flight to Seattle?
For the best prices, it is generally recommended to book at least 21 to 30 days in advance, particularly if you are traveling during the popular summer months.
Learn More About Price Tracking
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Trip Manta vs Google Flights
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Our Methodology
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How Often Do Prices Drop?
Data study: drop frequency, average savings, and how long drops last.
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