Which layover airport has the shortest travel time from Boston to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 10h 54m.

What airlines fly to Sofia?

Lufthansa, United Airlines and Turkish Airlines 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 62% 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.

Which layover airport has the shortest connection time from Boston to Sofia?

Vienna (VIE) has the shortest average layover time for this route: 1h 49m.

What is the cheapest airline that flies from Boston Logan Intl to Sofia?

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

Which airport is the most popular layover for flights between Boston and Sofia?

Frankfurt am Main (FRA) was the most common stop: 46% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Boston to Sofia?

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $566.

When did momondo last update prices for flights from Boston Logan Intl Airport to Sofia Airport?

Prices for flights from Boston Logan Intl Airport to Sofia Airport were last updated today.

How many operators does momondo search for flights from Boston Logan Intl Airport to Sofia Airport?

As of January 2026, there are 9 operators available to choose from for flights from Boston Logan Intl Airport to Sofia Airport.

How old do you have to be to fly from Boston Logan Intl Airport to Sofia Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$210 Cheap Flights from Boston to Sofia in 2026

Q: What is the typical price of a round-trip flight between Boston and Sofia?

Prices are currently low for flights on this route. Typical prices usually range from $428 to $757. The lowest price recently found on this route was $338.

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Find the cheapest flights from Boston to Sofia

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2:20 pm - 1:15 pm

BOS

SOF

15h 55m2 stops

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$338Lufthansa

Wed, Feb 4 - Wed, Feb 11

2:20 pm - 1:15 pm

BOS

SOF

15h 55m2 stops

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$340Lufthansa

Tue, Feb 3 - Tue, Feb 10

8:40 pm - 6:20 pm

BOS

SOF

14h 40m1 stop

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$354Lufthansa

Wed, Jan 28 - Wed, Feb 11

5:10 pm - 11:40 am

BOS

SOF

11h 30m1 stop

6:55 pm - 1:50 pm

SOF

BOS

25h 55m1 stop

$357Austrian Airlines

Tue, Apr 7 - Tue, Apr 21

3:40 pm - 1:15 pm

BOS

SOF

14h 35m2 stops

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$375Multiple Airlines

Wed, Jan 28 - Wed, Feb 11

3:35 pm - 11:50 am

BOS

SOF

13h 15m2 stops

6:45 pm - 2:05 pm

SOF

BOS

26h 20m1 stop

$377Multiple Airlines

Sun, Feb 1 - Mon, Feb 16

2:20 pm - 1:15 pm

BOS

SOF

15h 55m2 stops

2:15 pm - 10:02 am

SOF

BOS

26h 47m2 stops

$378Multiple Airlines

Tue, Jan 27 - Tue, Feb 10

10:45 am - 12:10 pm

BOS

SOF

18h 25m2 stops

12:55 pm - 5:40 pm

SOF

BOS

11h 45m1 stop

$379Multiple Airlines

Tue, Apr 7 - Tue, Apr 21

1:00 pm - 12:10 pm

BOS

SOF

16h 10m2 stops

6:10 am - 5:40 pm

SOF

BOS

18h 30m1 stop

$380Multiple Airlines

Wed, Apr 8 - Wed, Apr 22

9:50 pm - 3:15 pm

BOS

SOF

10h 25m1 stop

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$382Multiple Airlines

Wed, Feb 4 - Wed, Feb 11

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Feb 4

BOS2:20 pmBoston Logan Intl

15h 55m

2 stops

SOF1:15 pmSofia

Feb 11

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$338

Lufthansa

Feb 3

BOS2:20 pmBoston Logan Intl

15h 55m

2 stops

SOF1:15 pmSofia

Feb 10

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$340

Lufthansa

Jan 28

BOS8:40 pmBoston Logan Intl

14h 40m

1 stop

SOF6:20 pmSofia

Feb 11

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$354

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Apr 7

BOS5:10 pmBoston Logan Intl

11h 30m

1 stop

SOF11:40 amSofia

Apr 21

SOF6:55 pmSofia

25h 55m

1 stop

BOS1:50 pmBoston Logan Intl

$357

Austrian Airlines

Feb 20

BOS6:25 pmBoston Logan Intl

18h 20m

1 stop

SOF7:45 pmSofia

Mar 17

SOF7:55 amSofia

13h 10m

1 stop

BOS3:05 pmBoston Logan Intl

$437

Austrian Airlines

Feb 20

BOS1:55 pmBoston Logan Intl

22h 50m

2 stops

SOF7:45 pmSofia

Mar 17

SOF7:55 amSofia

13h 10m

1 stop

BOS3:05 pmBoston Logan Intl

$439

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/4

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Wed 2/11

2:00 pm-6:35 pm

1 stop11h 35m

$338

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/3

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Tue 2/10

2:00 pm-6:35 pm

1 stop11h 35m

$340

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/28

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Wed 2/11

2:00 pm-6:35 pm

1 stop11h 35m

$354

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/7

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Tue 4/21

6:55 pm-1:50 pm

1 stop25h 55m

$357

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/28

3:40 pm-1:15 pm

2 stops14h 35m

Sofia

Wed 2/11

2:00 pm-6:35 pm

1 stop11h 35m

$375

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 2/1

3:35 pm-11:50 am

2 stops13h 15m

Sofia

Mon 2/16

6:45 pm-2:05 pm

1 stop26h 20m

$377

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/27

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Tue 2/10

2:15 pm-10:02 am

2 stops26h 47m

$378

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/7

10:45 am-12:10 pm

2 stops18h 25m

Sofia

Tue 4/21

12:55 pm-5:40 pm

1 stop11h 45m

$379

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/8

1:00 pm-12:10 pm

2 stops16h 10m

Sofia

Wed 4/22

6:10 am-5:40 pm

1 stop18h 30m

$380

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/4

9:50 pm-3:15 pm

1 stop10h 25m

Sofia

Wed 2/11

2:00 pm-6:35 pm

1 stop11h 35m

$382

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Boston to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between Boston and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Boston is in November. 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 November, then book flights to Sofia from Boston during February instead. Flights to Sofia in February, while not as cheap as those in November, still average around $489.

How far in advance should I book a flight to Sofia?

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 $683 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 $605 on momondo.

How have Boston to Sofia flight prices changed over time?

As of January 2026, prices for Boston to Sofia flights are approximately 15% more expensive when compared to flights at the same time last year.

When to book flights from Boston to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Boston to Sofia (BOS to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Sofia

Fastest flight time	10h 15m
Direct flights	None

The fastest flight from Boston to Sofia takes 10h 15m

There are no direct flights from Boston to Sofia. There are no popular flight routes from Boston to Sofia.

Search flight deals

How far is Boston Logan Intl to Sofia by plane?
Boston Logan Intl and Sofia are 4519.3 mi apart from one another. In terms of flight time, this usually takes a little over 10h 15m.
When did momondo last update prices for flights from Boston Logan Intl Airport to Sofia Airport?
Prices for flights from Boston Logan Intl Airport to Sofia Airport were last updated today.
How many operators does momondo search for flights from Boston Logan Intl Airport to Sofia Airport?
As of January 2026, there are 9 operators available to choose from for flights from Boston Logan Intl Airport to Sofia Airport.
How old do you have to be to fly from Boston Logan Intl Airport to Sofia Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Boston to Sofia?
Based on momondo bookings for flights between Boston and Sofia, the leading airline is Lufthansa, making up 50% of the total bookings. Other popular airlines include United Airlines with 13%, Turkish Airlines with 9%, and KLM with 9%.

Best airlines flying from Boston to Sofia

Compare and see reviews for airlines that fly from Boston to Sofia with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $380	Free Cancellation	Rating 7.7 1,434 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 889 reviews	Search Austrian Airlines flights
Air France	PriceFrom $416	Free Cancellation	Rating 7.4 1,519 reviews	Search Air France flights
SWISS	PriceFrom $417	Free Cancellation	Rating 7.5 1,843 reviews	Search SWISS flights
United Airlines	PriceFrom $422	Free Cancellation	Rating 7.4 9,142 reviews	Search United Airlines flights
Lufthansa	PriceFrom $446	Free Cancellation	Rating 6.8 7,698 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 7,659 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,126 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $536	Free Cancellation	Rating 7.3 4,154 reviews	Search Turkish Airlines flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Sofia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Boston to Sofia. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Boston to Sofia with flexible booking policies on momondo?

Flights from Boston to Sofia with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Boston to Sofia?

Once you have performed a search for Boston to Sofia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Boston to Sofia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Sofia from Boston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from Boston to Sofia from $195

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Sofia departing on 3/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Cheap round-trip flights

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Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

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See travel insights to Sofia from

How to get the cheapest flight ticket from Boston to Sofia

What is the typical price of a round-trip flight between Boston and Sofia?

What is the cheapest month to fly to Sofia?

How far in advance should I book a flight to Sofia?

How have Boston to Sofia flight prices changed over time?

As of January 2026, prices for Boston to Sofia flights are approximately 15% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Boston Logan Intl to Sofia?

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

What airlines fly to Sofia?

Which airport is the most popular layover for flights between Boston and Sofia?

Frankfurt am Main (FRA) was the most common stop: 46% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Boston to Sofia?

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $566.

Which layover airport has the shortest travel time from Boston to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 10h 54m.

Which layover airport has the shortest connection time from Boston to Sofia?

Vienna (VIE) has the shortest average layover time for this route: 1h 49m.

When to book flights from Boston to Sofia

Cheap Boston to Sofia (BOS to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Sofia

Fastest flight time

Direct flights

How far is Boston Logan Intl to Sofia by plane?

When did momondo last update prices for flights from Boston Logan Intl Airport to Sofia Airport?

How many operators does momondo search for flights from Boston Logan Intl Airport to Sofia Airport?

How old do you have to be to fly from Boston Logan Intl Airport to Sofia Airport?

What documentation or ID do you need to fly to Sofia Airport?

What is the most popular airline from Boston to Sofia?

Best airlines flying from Boston to Sofia

Compare and see reviews for airlines that fly from Boston to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Sofia?

Can I find flights from Boston to Sofia with flexible booking policies on momondo?

How can momondo help me find flights from Boston to Sofia?

I’m not ready to book a flight from Boston to Sofia right now. Can momondo alert me if prices change?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo