Basel Mulhouse Freiburg (BSL) to Seattle / Tacoma (SEA) flight deal in economy from $760

Sunday, December 13th, 2026

10 round-trip options

Returning
Fri, Dec 18, 20265 Day Trip
$1,582 USD
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Sat, Dec 19, 20266 Day Trip
$1,512 USD
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Sun, Dec 20, 20267 Day Trip
$1,203 USD
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Mon, Dec 21, 20268 Day Trip
$1,180 USD
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Tue, Dec 22, 20269 Day Trip
$1,245 USD
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Wed, Dec 23, 202610 Day Trip
$1,092 USD
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Thu, Dec 24, 202611 Day Trip
$1,020 USD
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Fri, Dec 25, 202612 Day Trip
$1,020 USD
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Sat, Dec 26, 202613 Day Trip
$1,030 USD
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Sun, Dec 27, 202614 Day Trip
$973 USD