Cheap flights from Boston to Barcelona from $324

The cheapest month to fly to Barcelona-El Prat Airport from Boston is in September. Flight prices, which tend to average around $478, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Barcelona-El Prat Airport from Boston during October instead. Flights to Barcelona-El Prat Airport in October, while not as cheap as those in September, still average around $481.

The cheapest day to depart on your flight to Barcelona-El Prat Airport is on a Monday when prices can be found for as low as $533. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $666. These prices are subject to change though, so be sure to set up a Price Alert for flights to Barcelona-El Prat Airport.

Flying to Barcelona-El Prat Airport from Boston in the evening is the least expensive time of day to depart. momondo users have found prices as low as $615 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $626 on average. Flights to Barcelona-El Prat Airport from Boston in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Boston Logan Intl to Barcelona-El Prat for the best Boston Logan Intl - Barcelona-El Prat flight prices

You are more likely to see cheaper flights to Barcelona-El Prat Airport from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Barcelona-El Prat Airport for around $578 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Barcelona-El Prat Airport from Boston for as low as $468 on momondo.

KLM, Delta, and United Airlines are the most popular carriers operating from Boston Logan Intl to Barcelona-El Prat

Iberia, LEVEL and LEVEL are the top three most popular airlines that fly to Barcelona-El Prat Airport from Boston according to our data. Iberia is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Barcelona-El Prat Airport. Keep in mind that there are 24 different airlines that fly to Barcelona-El Prat Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% of flights between Boston and Barcelona have experienced a delay on any given week. The average delay length over the past 12 months has been 132 minutes.

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

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

According to our data, LEVEL have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

Lisbon (LIS) was the most common stop: 31% of momondo users choosing 1-stop flights on this route connected there.

Flights via Paris (CDG) offer the lowest average round-trip price of $406.

Flights connecting via Paris (CDG) have the shortest average one-way travel time: 9h 40m.

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

The number of flights available between Boston and Barcelona-El Prat Airport is 2 per day as of May 2026. The most frequent departure time is 10:00PM, with 100% of daily flights leaving in the evening.

As of May 2026, 19 flights take off from Boston and land in Barcelona-El Prat Airport each week. The most common flight departure day for this route is Mon, with 26% of weekly flights taking off on this day.