Cheapest return flights from Seattle to Lisbon in May from 755€

Best time to book flights for Seattle (SEA) to Lisbon (LIS) flights at AirHint

AirHint found the following cheapest return flights from Seattle (SEA) to Lisbon (LIS) in May 2025 (see full year).

Return flights

04 May - 11 May Icelandair
05 May - 12 May Spirit Airlines
05 May - 17 May Icelandair
01 May - 08 May Icelandair
06 May - 13 May Spirit Airlines
07 May - 14 May Spirit Airlines
02 May - 09 May Icelandair
07 May - 21 May Icelandair
03 May - 10 May Spirit Airlines
23 May - 27 May Icelandair
20 May - 05 Jun United
07 May - 04 Jun Delta

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

Skyscanner

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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