AirHint found the following cheapest return flights from Seattle (SEA) to Copenhagen (CPH) in May 2026 (see full year).

Return flights

14 May - 24 May	Icelandair
20 May - 27 May	Icelandair
01 May - 08 May	Icelandair
04 May - 11 May	Icelandair
07 May - 14 May	Icelandair
10 May - 17 May	Icelandair
07 May - 10 May	Icelandair
10 May - 02 Jun	Finnair
10 May - 30 May	Icelandair
15 May - 24 May	Scandinavian Airlines
24 May - 31 May	Icelandair
25 May - 01 Jun	Icelandair
22 May - 07 Jun	Icelandair
29 May - 14 Jun	Icelandair
31 May - 07 Jun	Icelandair
26 May - 02 Jun	Icelandair
27 May - 03 Jun	Icelandair
28 May - 04 Jun	Icelandair
30 May - 06 Jun	Icelandair
26 May - 02 Jun	Scandinavian Airlines	direct

Also check the deals for one-way flights from Seattle to Copenhagen in May.

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.

Book a cheap hotel in Copenhagen

Cheap car rent in Copenhagen

Cheapest return flights from Seattle to Copenhagen in May from $432

Return flights