Basel Mulhouse Freiburg (BSL) to Seattle / Tacoma (SEA) flight deal from $537 USD in economy class – flightdeals.net

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Air France

Delta Air Lines

DLDelta Air Lines

KLM

Round Trip•Economy

Euro Airport Basel-Mulhouse-Freiburg

Basel Mulhouse Freiburg, France

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$870 USD

-38%$537 USD

Verified Dec 1, 2025 at 4:04 AM

February 2026

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26$537 27$537 28$537 29$537 30$537 31$537 1$543 2$537 3$537 4$537 5$537 6$537 7$543 8$543 9$537 10$537 11$537 12$537 13$537 14$695 15$543 16$628 17$537 18$543 19$537 20$543 21$574 22$543 23$537 24$537 25$537 26$537 27$537 28$543 1

Good Availability

49% of dates checked are available within 10% of the lowest price

Tuesday, February 24th, 2026

5 round-trip options

Returning

Sun, Mar 1, 2026•5 Day Trip

$542 USD

Returning

Mon, Mar 2, 2026•6 Day Trip

$537 USD

Returning

Tue, Mar 3, 2026•7 Day Trip

$537 USD

Returning

Wed, Mar 4, 2026•8 Day Trip

$542 USD

Returning

Thu, Mar 5, 2026•9 Day Trip

$537 USD