Southwest Airlines Southwest Airlines Round Trip Baltimore to Seattle Basic Economy Sep-Nov 2026

• Expedia now offers Southwest Airlines flights from Washington, D.C. to Seattle round trip, now priced at $137.
• Basic Economy fare, both directions require 1 stop.
• One personal item and one carry-on bag are allowed; seat selection and changes are not permitted.
• Actual prices may vary depending on airline/hotel location, flight times/season, or travel dates.
• Travel dates: September through November
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Departing from Baltimore/Washington International Airport (BWI): Sep 1-2, 5, 8-9, 12, 15-16, 19, 22-23, 26, 29-30; Oct 3, 6, 14, 17, 20-21, 24, 27-28; Nov 3-4, 7, 10-11, 14, 17-18 

Departing from Seattle (SEA): Sep 1-2, 5, 8-9, 12, 15-16, 19, 22-23, 26, 29-30; Oct 3, 6-7, 14, 17, 20-21, 24, 27-28; Nov 3-4, 7, 10-11, 14, 17-18