AirHint found the following cheapest return flights from Lisbon (LIS) to Boston (BOS) in May 2026 (see full year).
Return flights
| 04 May - 11 May | Iberia | ||
| 20 May - 03 Jun | Iberia | ||
| 04 May - 11 May | TAP | direct | |
| 28 May - 04 Jun | Lufthansa | ||
| 28 May - 04 Jun | TAP | direct |
Also check the deals for one-way flights from Lisbon to Boston in May.
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