Cheapest return flights from Seattle to Lisbon in May from 369€

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

Return flights

02 May - 10 May Icelandair
04 May - 12 May Air Canada
05 May - 13 May Air Canada
12 May - 20 May Air Canada
06 May - 14 May Air Canada
11 May - 19 May Air Canada
13 May - 21 May Air Canada
07 May - 15 May Air Canada
14 May - 22 May Air Canada
10 May - 18 May Air Canada
19 May - 13 Jun Lufthansa
21 May - 22 Jun Lufthansa

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

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