St. Louis (STL) to Seattle / Tacoma (SEA) cheap flight deal from $94 USD in economy class – flightdeals.net

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Southwest Airlines

WNSouthwest Airlines

One Way•Economy

Lambert-Saint Louis International Airport

St. Louis, United States

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$172 USD

-45%$94 USD

Verified Sep 20, 2025 at 3:36 PM

September 2025

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20$275 21$275 22$265 23$275 24$275 25$265 26$265 27$235 28$245 29$235 30$245 1$245 2$245 3$245 4$179 5$215

Limited Availability

16% of dates checked are available within 10% of the lowest price

Friday, September 19th, 2025

No flight details available for this date.