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

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

What airlines fly to Sofia?

Lufthansa, KLM 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 47% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 8 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

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

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $602.

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 47m.

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

Vienna (VIE) has the shortest average layover time for this route: 1h 48m.

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 August 2026, there are 8 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.

$323 Cheap Flights from Boston to Sofia in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Boston to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:50 pm - 1:35 amBOS Boston Logan Intl-SOF Sofia

21h 45m3 stops Reykjavik Keflavik Intl Brussels Bruxelles-National Barcelona-El Prat

6:55 am - 8:20 pmSOF Sofia-BOS Boston Logan Intl

20h 25m3 stops Barcelona-El Prat Lisbon Humberto Delgado Porto

$829Multiple Airlines

Sun, Oct 4 - Sun, Oct 18

2:40 pm - 6:00 pmBOS Boston Logan Intl-SOF Sofia

20h 20m2 stops Washington, D.C. Dulles Intl Vienna Intl

7:55 am - 1:30 pmSOF Sofia-BOS Boston Logan Intl

12h 35m1 stop Vienna Intl

$830Austrian Airlines

Tue, Nov 17 - Tue, Dec 1

9:50 pm - 11:45 amBOS Boston Logan Intl-SOF Sofia

30h 55m1 stop Istanbul

9:10 pm - 7:05 pmSOF Sofia-BOS Boston Logan Intl

28h 55m1 stop Istanbul

$831Turkish Airlines

Wed, Oct 14 - Sat, Oct 24

8:00 pm - 8:55 pmBOS Boston Logan Intl-SOF Sofia

17h 55m1 stop Istanbul

4:00 pm - 6:05 pmSOF Sofia-BOS Boston Logan Intl

33h 05m1 stop Istanbul

$831Turkish Airlines

Mon, Jan 18 - Sun, Jan 31

11:10 am - 11:35 pmBOS Boston Logan Intl-SOF Sofia

29h 25m3 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat

4:50 pm - 8:45 pmSOF Sofia-BOS Boston Logan Intl

34h 55m3 stops Barcelona-El Prat Lisbon Humberto Delgado Porto

$831Multiple Airlines

Sat, Nov 21 - Sat, Nov 28

7:41 pm - 10:55 pmBOS Boston Logan Intl-SOF Sofia

20h 14m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

2:00 pm - 11:54 pmSOF Sofia-BOS Boston Logan Intl

16h 54m2 stops Munich Franz Josef Strauss Washington, D.C. Dulles Intl

$834Lufthansa

Tue, Nov 17 - Tue, Dec 1

7:41 pm - 10:55 pmBOS Boston Logan Intl-SOF Sofia

20h 14m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

6:00 am - 11:54 pmSOF Sofia-BOS Boston Logan Intl

24h 54m2 stops Munich Franz Josef Strauss Washington, D.C. Dulles Intl

$834Lufthansa

Tue, Nov 17 - Tue, Dec 1

8:40 pm - 10:55 pmBOS Boston Logan Intl-SOF Sofia

19h 15m1 stop Munich Franz Josef Strauss

2:00 pm - 6:35 pmSOF Sofia-BOS Boston Logan Intl

11h 35m1 stop Munich Franz Josef Strauss

$841United Airlines

Mon, Jan 25 - Fri, Jan 29

10:30 am - 10:55 pmBOS Boston Logan Intl-SOF Sofia

29h 25m2 stops Newark Munich Franz Josef Strauss

2:00 pm - 6:35 pmSOF Sofia-BOS Boston Logan Intl

11h 35m1 stop Munich Franz Josef Strauss

$845United Airlines

Mon, Jan 25 - Fri, Jan 29

6:55 pm - 11:50 amBOS Boston Logan Intl-SOF Sofia

9h 55m1 stop Vienna Intl

7:55 am - 1:30 pmSOF Sofia-BOS Boston Logan Intl

12h 35m1 stop Vienna Intl

$845Austrian Airlines

Fri, Dec 11 - Fri, Dec 25

Cheap last minute flights

Enter your travel dates to find the best prices.

8:05 pm - 11:15 pmBOS Boston Logan Intl-SOF Sofia

20h 10m1 stop Munich Franz Josef Strauss

6:10 am - 5:40 pmSOF Sofia-BOS Boston Logan Intl

18h 30m1 stop Munich Franz Josef Strauss

$931United Airlines

Mon, Aug 17 - Mon, Aug 24

8:05 pm - 11:15 pmBOS Boston Logan Intl-SOF Sofia

20h 10m1 stop Munich Franz Josef Strauss

6:10 am - 5:40 pmSOF Sofia-BOS Boston Logan Intl

18h 30m1 stop Munich Franz Josef Strauss

$931United Airlines

Mon, Aug 17 - Tue, Aug 25

5:10 pm - 10:20 amBOS Boston Logan Intl-SOF Sofia

10h 10m1 stop Zurich

3:40 pm - 3:10 pmSOF Sofia-BOS Boston Logan Intl

30h 30m1 stop Zurich

$951SWISS

Tue, Aug 18 - Mon, Sep 7

5:10 pm - 6:20 pmBOS Boston Logan Intl-SOF Sofia

18h 10m1 stop Vienna Intl

8:00 am - 1:50 pmSOF Sofia-BOS Boston Logan Intl

12h 50m1 stop Vienna Intl

$956Austrian Airlines

Thu, Aug 20 - Sat, Sep 5

5:10 pm - 6:20 pmBOS Boston Logan Intl-SOF Sofia

18h 10m1 stop Vienna Intl

8:00 am - 1:50 pmSOF Sofia-BOS Boston Logan Intl

12h 50m1 stop Vienna Intl

$957Austrian Airlines

Thu, Aug 20 - Sat, Sep 5

5:10 pm - 10:20 amBOS Boston Logan Intl-SOF Sofia

10h 10m1 stop Zurich

3:40 pm - 3:10 pmSOF Sofia-BOS Boston Logan Intl

30h 30m1 stop Zurich

$975SWISS

Wed, Aug 19 - Mon, Sep 7

7:23 pm - 6:40 pmBOS Boston Logan Intl-SOF Sofia

16h 17m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

12:55 pm - 11:59 pmSOF Sofia-BOS Boston Logan Intl

18h 04m2 stops Munich Franz Josef Strauss Washington, D.C. Dulles Intl

$980Lufthansa

Thu, Aug 20 - Sat, Sep 5

10:40 am - 10:20 amBOS Boston Logan Intl-SOF Sofia

16h 40m2 stops Montreal Pierre Elliott Trudeau Intl Zurich

3:40 pm - 3:10 pmSOF Sofia-BOS Boston Logan Intl

30h 30m1 stop Zurich

$981Multiple Airlines

Wed, Aug 19 - Mon, Sep 7

3:35 pm - 3:20 pmBOS Boston Logan Intl-SOF Sofia

16h 45m2 stops Montreal Pierre Elliott Trudeau Intl Vienna Intl

3:40 pm - 3:10 pmSOF Sofia-BOS Boston Logan Intl

30h 30m1 stop Zurich

$984Multiple Airlines

Tue, Aug 18 - Mon, Sep 7

8:05 pm - 6:40 pmBOS Boston Logan Intl-SOF Sofia

15h 35m1 stop Munich Franz Josef Strauss

12:55 pm - 5:40 pmSOF Sofia-BOS Boston Logan Intl

11h 45m1 stop Munich Franz Josef Strauss

$1,005Lufthansa

Thu, Aug 20 - Sat, Sep 5

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United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Jan 25

BOS8:40 pmBoston Logan Intl

19h 15m

1 stop

SOF10:55 pmSofia

Jan 29

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$841

United Airlines

Oct 23

BOS8:05 pmBoston Logan Intl

20h 10m

1 stop

SOF11:15 pmSofia

Nov 4

SOF6:00 amSofia

19h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$875

United Airlines

Oct 7

BOS8:05 pmBoston Logan Intl

20h 10m

1 stop

SOF11:15 pmSofia

Oct 16

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$877

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Nov 17

BOS7:41 pmBoston Logan Intl

20h 14m

2 stops

SOF10:55 pmSofia

Dec 1

SOF2:00 pmSofia

16h 54m

2 stops

BOS11:54 pmBoston Logan Intl

$834

Lufthansa

Feb 11

BOS8:40 pmBoston Logan Intl

19h 15m

1 stop

SOF10:55 pmSofia

Feb 25

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$860

Lufthansa

Sep 6

BOS8:05 pmBoston Logan Intl

15h 35m

1 stop

SOF6:40 pmSofia

Sep 11

SOF12:55 pmSofia

11h 45m

1 stop

BOS5:40 pmBoston Logan Intl

$861

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Sun 10/4

8:50 pm-1:35 am

3 stops21h 45m

Sofia

Sun 10/18

6:55 am-8:20 pm

3 stops20h 25m

$829

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/17

2:40 pm-6:00 pm

2 stops20h 20m

Sofia

Tue 12/1

7:55 am-1:30 pm

1 stop12h 35m

$830

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Wed 10/14

9:50 pm-11:45 am

1 stop30h 55m

Sofia

Sat 10/24

9:10 pm-7:05 pm

1 stop28h 55m

$831

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 1/18

8:00 pm-8:55 pm

1 stop17h 55m

Sofia

Sun 1/31

4:00 pm-6:05 pm

1 stop33h 05m

$831

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Sat 11/21

11:10 am-11:35 pm

3 stops29h 25m

Sofia

Sat 11/28

4:50 pm-8:45 pm

3 stops34h 55m

$831

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/17

7:41 pm-10:55 pm

2 stops20h 14m

Sofia

Tue 12/1

2:00 pm-11:54 pm

2 stops16h 54m

$834

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/17

7:41 pm-10:55 pm

2 stops20h 14m

Sofia

Tue 12/1

6:00 am-11:54 pm

2 stops24h 54m

$834

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 1/25

8:40 pm-10:55 pm

1 stop19h 15m

Sofia

Fri 1/29

2:00 pm-6:35 pm

1 stop11h 35m

$841

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 1/25

10:30 am-10:55 pm

2 stops29h 25m

Sofia

Fri 1/29

2:00 pm-6:35 pm

1 stop11h 35m

$845

Quickest round-trip

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Fri 12/11

6:55 pm-11:50 am

1 stop9h 55m

Sofia

Fri 12/25

7:55 am-1:30 pm

1 stop12h 35m

$845

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?

Prices are currently typical for flights on this route.

Typical prices usually range from $554 to $918.
The lowest price recently found on this route was $829.

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Boston is in February. Flight prices, which tend to average around $460, 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 November instead. Flights to Sofia in November, while not as cheap as those in February, still average around $478.

How far in advance should I book a flight from Boston 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 $662 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.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 58% on your flight if you consider stops on a Boston to Sofia flight.

How have Boston to Sofia flight prices changed over time?

As of August 2026, prices for Boston to Sofia flights are approximately 39% cheaper 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	15h 35m
Direct flights	None

The fastest flight from Boston to Sofia takes 15h 35m

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

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Frequently asked questions about flying from Boston to Sofia

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 15h 35m.
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 August 2026, there are 8 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 34% of the total bookings. Other popular airlines include KLM with 17%, Turkish Airlines with 12%, and United Airlines 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 7.8 1,558 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 947 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $394	Free Cancellation	Rating 7.4 10,106 reviews	Search United Airlines flights
Lufthansa	PriceFrom $396	Free Cancellation	Rating 6.8 8,194 reviews	Search Lufthansa flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.5 1,646 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 2,036 reviews	Search SWISS flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,170 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,472 reviews	Search Turkish Airlines flights
ITA Airways	PriceFrom $694	Free Cancellation	Rating 6.7 1,321 reviews	Search ITA Airways 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 $323

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 10/27. 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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United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

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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 from Boston to Sofia?

Can stopping save me money on Boston to Sofia flights?

How have Boston to Sofia flight prices changed over time?

What airlines fly to Sofia?

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

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

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

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

When to book flights from Boston to Sofia

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

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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

Cabin classes currently available on flights to Sofia

List of cabin classes available on flights landing in Sofia. Availability may vary depending on flight origin and airline.

Popular cities in Bulgaria

Popular flights according to clicks in the last 7 days on momondo

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According to popular flight searches on momondo this year

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