Every Boston–Lisbon fare we track, measured against the route's typical price whenever there is enough cached history to build one. Subscribe in any RSS reader for free single-route price alerts — no account, no email needed.https://flight.dealsen-ushttps://flight.deals/flights/boston-to-lisbon/#2027-04-03-2027-04-10-TPhttps://flight.deals/flights/boston-to-lisbon/#2027-04-03-2027-04-10-TPBOS → LIS round-trip on TAP Air Portugal, 2027-04-03 to 2027-04-10 (7 nights). Cached fare $377. Not enough cached history on this route yet to say what it usually costs.Mon, 17 Aug 2026 06:03:15 GMT