Cheap flights from Boston to Sofia from $329

The cheapest month to fly to Sofia from Boston is in February. Flight prices, which tend to average around $461, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Sofia from Boston during April instead. Flights to Sofia in April, while not as cheap as those in February, still average around $556.

You are more likely to see cheaper flights to Sofia from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $755 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Boston for as low as $474 on momondo.

You could potentially save up to 64% on your flight if you consider stops on a Boston to Sofia flight.

As of November 2026, prices for Boston to Sofia flights are approximately 30% cheaper when compared to flights at the same time last year.

British Airways is the most popular carrier operating from Boston Logan Intl to Sofia

Lufthansa, Turkish Airlines and KLM are the top three most popular airlines that fly to Sofia from Boston according to our data. Lufthansa is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 9 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

Rome (FCO) was the most common stop: 23% of momondo users choosing 1-stop flights on this route connected there.

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $625.

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 10h 38m.

Vienna (VIE) has the shortest average layover time for this route: 1h 45m.