Boston (BOS) to Lisbon (LIS): 3,184 miles (5,124 km) great-circle, about 6h 50m nonstop by our estimate. Cheapest fare observed: $882 round-trip on Air Canada, with 2 stops, departing May 20, 2026.
$882 round-trip, Air Canada AC751, departing 2026-05-20 at 10:35, returning 2026-05-27. The recorded itinerary left on a Wednesday, returning on a Wednesday 7 nights later; the fare was observed 25 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $882, it ranked 21st of the 30 round-trip fares we recorded from BOS (median $623). That is 27.7 cents per great-circle mile (round-trip price over one-way distance), above the BOS median of 19.1 cents across 30 round-trip routes.
Routes from BOS of similar length: London (3,256 mi) at $757 and Edinburgh (3,061 mi) at $725.
BOS to LIS is the only one of 30 BOS routes where Air Canada priced cheapest. It is the 14th longest of the 30 routes we track from BOS.
Of 24 departure airports with a fare to Lisbon, Boston (BOS) ranked 21st at $882. Lowest: $81 from Madrid (MAD); highest: $1476 from Buenos Aires (EZE); 10 nonstop. Cheapest-fare airlines (routes): easyJet (4), Ryanair (4), Air Europa (2), TAP Portugal (2), Air Canada (1) and Air Serbia (1), plus 10 more.
That depends on your passport and trip, so check the official source for Portugal: European Commission: Schengen visa policy. Connecting elsewhere? Check that country's transit rules too.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, Europe/Lisbon; flight time is our estimate.