Cheap flights from Boston to Lisbon from $403

In general, February is the cheapest month to fly from Boston to Lisbon. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $612. If you are unable to visit Lisbon during the month of February, then departing from Boston during the month November is also very affordable. Most momondo users find prices during this month for around $629.

Our data shows that Monday is the least expensive day to fly to Lisbon. Tickets to fly out on this day can be as low as $785. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Boston to Lisbon for around $835.

The cheapest time of day to fly to Lisbon is in the afternoon when flights can be purchased for as low as $808. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $814 on average. Flights to Lisbon from Boston in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Boston Logan Intl to Lisbon Humberto Delgado for the best Boston Logan Intl - Lisbon Humberto Delgado flight prices

You are more likely to see cheaper flights to Lisbon from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Lisbon for around $789 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Lisbon from Boston for as low as $720 on momondo.

No. A direct flight is the cheapest option for a flight between Boston to Lisbon.

As of May 2026, prices for Boston to Lisbon flights are approximately 2% more expensive when compared to flights at the same time last year.

KLM and Delta are the most popular carriers operating from Boston Logan Intl to Lisbon Humberto Delgado

TAP AIR PORTUGAL, Delta and Air France are the top three most popular airlines that fly to Lisbon from Boston according to our data. TAP AIR PORTUGAL is the first choice among our users, with 68% of people opting to fly with this airline when traveling to Lisbon. Keep in mind that there are 19 different airlines that fly to Lisbon on a routine basis, so you have a few additional options to choose from.

Historically, on average around 18% of flights between Boston and Lisbon have experienced a delay on any given week. The average delay length over the past 12 months has been 128 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Tuesday has historically seen more delays on average compared to the rest of the week.

According to our data, TAP AIR PORTUGAL have had the least number of delays on this route over the last 12 months; with about 18% of their flights experiencing any sort of delay.

Ponta Delgada (PDL) was the most common stop: 24% of momondo users choosing 1-stop flights on this route connected there.

Flights via Reykjavik (KEF) offer the lowest average round-trip price of $486.

Flights connecting via Porto (OPO) have the shortest average one-way travel time: 9h 05m.

Zurich (ZRH) has the shortest average layover time for this route: 1h 15m.

The number of flights available between Boston and Lisbon is 9 per day as of May 2026. The most frequent departure time is 11:00PM, with 100% of daily flights leaving in the evening.

As of May 2026, there are 63 flights per week flying from Boston to Lisbon. The most common day of the week flights depart is Mon, with 16% of flights taking off on this day.