Cheap flights from Boston to Lisbon
The cheapest round trip from Boston to Lisbon that travelers found recently is $365 with a carry-on: a $365 fare on S4, which usually includes a carry-on. It leaves Fri, Jan 15 and comes back Mon, Jan 18.
Live prices for Fri, Jan 15 to Mon, Jan 18
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Fri, Jan 15 | Mon, Jan 18 | S4 | BOS → LIS | 2 stops | $365 | Included | $365 | Live price |
| Sun, Oct 18 | Sun, Oct 25 | S4 | BOS → LIS | 2 stops | $552 | Included | $552 | Live price |
| Wed, Oct 21 | Sun, Oct 25 | S4 | BOS → LIS | 2 stops | $563 | Included | $563 | Live price |
| Thu, Oct 22 | Sun, Oct 25 | S4 | BOS → LIS | 2 stops | $563 | Included | $563 | Live price |
| Mon, Feb 1 | Sun, Feb 7 | Air Canada | BOS → LIS | 1 stop | $704 | Included | $704 | Live price |
| Mon, Mar 29 | Sun, Apr 4 | TAP Air Portugal | BOS → LIS | 1 stop | $752 | Included | $752 | Live price |
| Mon, Jun 21 | Sat, Jun 26 | TAP Air Portugal | BOS → LIS | 1 stop | $855 | Included | $855 | Live price |
| Sat, Jun 19 | Sat, Jun 26 | United | BOS → LIS | 1 stop | $856 | Included | $856 | Live price |
| Tue, Dec 22 | Mon, Dec 28 | Air Canada | BOS → LIS | 1 stop | $859 | Included | $859 | Live price |
| Sat, Nov 21 | Sat, Nov 28 | Air Canada | BOS → LIS | 1 stop | $926 | Included | $926 | Live price |
Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.
Cheapest month to fly
| Month | Cheapest trip | From | Live prices |
|---|---|---|---|
| October 2026 | Sun, Oct 18 to Sun, Oct 25, 7 nights | $552 | Live price |
| November 2026 | Sat, Nov 21 to Sat, Nov 28, 7 nights | $926 | Live price |
| December 2026 | Tue, Dec 22 to Mon, Dec 28, 6 nights | $859 | Live price |
| January 2027 | Fri, Jan 15 to Mon, Jan 18, 3 nights | $365 | Live price |
| February 2027 | Mon, Feb 1 to Sun, Feb 7, 6 nights | $704 | Live price |
| March 2027 | Mon, Mar 29 to Sun, Apr 4, 6 nights | $752 | Live price |
Bag fees on this route
What the airlines flying Boston to Lisbon usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.
| Airline | Carry-on, each way | Checked bag, each way |
|---|---|---|
| Air Canada | Included | Included |
| S4 | Included | Included |
| TAP Air Portugal | Included | Included |
| United | Included | Included |
Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.
How these prices work
These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).
Not sure where to go? Tell Dipt your budget and vibe and it finds the trip.
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