Cheapest return LIS–BOS flights, September

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

Return flights

07 Sep - 23 Sep Iberia
03 Sep - 09 Sep Iberia
05 Sep - 09 Sep Iberia
01 Sep - 09 Sep LEVEL
06 Sep - 10 Sep LEVEL
03 Sep - 10 Sep LEVEL
02 Sep - 08 Sep TAP
08 Sep - 15 Sep Iberia
08 Sep - 15 Sep TAP direct
02 Sep - 07 Sep Lufthansa
25 Sep - 10 Oct United
20 Sep - 04 Oct Delta
25 Sep - 10 Oct TAP direct

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

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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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