Cheapest return flights from Seattle to Glasgow in December from $1214

AirHint found the following cheapest return flights from Seattle (SEA) to Glasgow (GLA) in December 2025 (see full year).

Return flights

23 Dec - 07 Jan KLM
24 Dec - 01 Jan Iberia

Also check the deals for one-way flights from Seattle to Glasgow in December.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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