Round trip flights between Baltimore and Seattle for $137

Southwest Airlines and Expedia are offering round trip airfares between Baltimore MD (BWI) and Seattle (SEA) for $137. These flights include one stop each way and are basic economy fares with a personal item and a carry-on allowed, but no seat selection or changes. The deal is available for travel from September through November 2026, with specific dates listed for both departure points.

This fare provides a significant savings on one of the lower-priced options for this route, especially considering the limited restrictions on baggage and no change fees. The price is consistent with or better than typical fares for this route during that period, making it a compelling option for flexible travelers within the specified date range.