Cheapest return flights from Boston to Lisbon in September from $443

Best time to book flights for Boston (BOS) to Lisbon (LIS) flights at AirHint

AirHint found the following cheapest return flights from Boston (BOS) to Lisbon (LIS) in September 2025 (see full year).

Return flights

26 Sep - 02 Oct LEVEL
29 Sep - 06 Oct LEVEL
08 Sep - 15 Sep LEVEL
06 Sep - 12 Sep LEVEL
03 Sep - 17 Sep LEVEL
16 Sep - 24 Sep LEVEL
02 Sep - 09 Sep LEVEL
01 Sep - 09 Sep LEVEL
23 Sep - 05 Oct LEVEL
06 Sep - 13 Sep LEVEL
07 Sep - 13 Sep LEVEL
04 Sep - 17 Sep LEVEL
04 Sep - 09 Sep LEVEL
08 Sep - 24 Oct LEVEL
25 Sep - 05 Oct LEVEL
08 Sep - 17 Oct LEVEL
29 Sep - 06 Oct TAP direct
08 Sep - 17 Oct TAP direct
08 Sep - 24 Oct TAP direct
25 Sep - 05 Oct TAP direct

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