Roundtrip St Louis to Seattle Airfare on Southwest Airlines

No special codes or coupons are required. Get this roundtrip airfare while available. This deal is for basic economy fares on Southwest Airlines, which allow for a personal item and a carry-on bag, but no free checked bag.

Travel is available on select dates:

• Departing St Louis: September 30; October 1, 7-8, 14, 21-22, 28-29; November 4-5, 11-12, 18-19; December 2-3, 9-10
• Departing Seattle: September 30; October 1, 28-29; November 4-5, 11-12, 18-19; December 3, 9-10, 16

This offer expires on December 31, 2025.