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

Return flights

08 May - 17 May	Iberia For Level
08 May - 22 May	Iberia
11 May - 25 May	Air Canada
14 May - 28 May	Iberia
28 May - 07 Jun	Finnair
11 May - 25 May	TAP	direct
14 May - 28 May	TAP	direct
08 May - 17 May	TAP	direct

Also check the deals for one-way flights from Boston to Lisbon 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.

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Cheapest return flights from Boston to Lisbon in May from 405€

Return flights