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

Frankfurt am Main (FRA) was the most common stop: 23% 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 $603.

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 38m.

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

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

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 48% 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.

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 September 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.

$277 Cheap Flights from Boston to Sofia in 2026/27

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.

8:15 pm - 5:00 pmBOS Boston Logan Intl-SOF Sofia

14h 45m1 stop Madrid Barajas

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

14h 00m1 stop Madrid Barajas

$624Multiple Airlines

Mon, Oct 26 - Mon, Nov 9

8:15 pm - 5:00 pmBOS Boston Logan Intl-SOF Sofia

14h 45m1 stop Madrid Barajas

10:40 am - 11:44 pmSOF Sofia-BOS Boston Logan Intl

20h 04m2 stops Madrid Barajas New York John F Kennedy Intl

$627Multiple Airlines

Mon, Oct 26 - Mon, Nov 9

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

$663Austrian Airlines

Tue, Feb 23 - Tue, Mar 9

5:28 pm - 7:20 pmBOS Boston Logan Intl-SOF Sofia

18h 52m2 stops New York John F Kennedy Intl London Heathrow

9:05 pm - 4:40 pmSOF Sofia-BOS Boston Logan Intl

26h 35m2 stops London Heathrow New York John F Kennedy Intl

$667British Airways

Sun, Oct 11 - Wed, Nov 4

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

$671Austrian Airlines

Tue, Nov 3 - Tue, Nov 17

7:45 pm - 8:10 pmBOS Boston Logan Intl-SOF Sofia

42h 25m2 stops New York LaGuardia London Heathrow

8:10 pm - 6:48 pmSOF Sofia-BOS Boston Logan Intl

29h 38m2 stops London Heathrow New York John F Kennedy Intl

$684British Airways

Mon, Mar 22 - Mon, Apr 5

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

19h 15m1 stop Munich Franz Josef Strauss

6:25 am - 1:45 pmSOF Sofia-BOS Boston Logan Intl

14h 20m1 stop Frankfurt am Main

$699Lufthansa

Sun, Jan 10 - Wed, Jan 20

9:30 am - 10:55 pmBOS Boston Logan Intl-SOF Sofia

30h 25m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

7:55 am - 9:59 pmSOF Sofia-BOS Boston Logan Intl

21h 04m2 stops Vienna Intl Newark

$701United Airlines

Tue, Nov 3 - Tue, Nov 17

12:30 pm - 1:15 pmBOS Boston Logan Intl-SOF Sofia

18h 45m3 stops Newark Charlotte Douglas Munich Franz Josef Strauss

8:00 am - 5:25 pmSOF Sofia-BOS Boston Logan Intl

16h 25m2 stops Vienna Intl Newark

$706United Airlines

Tue, Mar 23 - Tue, Apr 6

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

$717Lufthansa

Mon, Jan 25 - Mon, Feb 8

Cheap last minute flights

Enter your travel dates to find the best prices.

9:40 pm - 3:05 pmBOS Boston Logan Intl-SOF Sofia

10h 25m1 stop Zurich

1:05 pm - 7:55 pmSOF Sofia-BOS Boston Logan Intl

13h 50m1 stop Zurich

$952SWISS

Thu, Oct 1 - Tue, Oct 6

10:55 pm - 1:35 amBOS Boston Logan Intl-SOF Sofia

19h 40m1 stop Barcelona-El Prat

6:55 pm - 2:45 pmSOF Sofia-BOS Boston Logan Intl

26h 50m2 stops Rome Fiumicino Lisbon Humberto Delgado

$957Multiple Airlines

Wed, Sep 30 - Wed, Oct 7

10:55 pm - 1:35 amBOS Boston Logan Intl-SOF Sofia

19h 40m1 stop Barcelona-El Prat

6:55 pm - 2:45 pmSOF Sofia-BOS Boston Logan Intl

26h 50m2 stops Rome Fiumicino Lisbon Humberto Delgado

$958Multiple Airlines

Wed, Sep 30 - Wed, Oct 7

9:40 pm - 3:05 pmBOS Boston Logan Intl-SOF Sofia

10h 25m1 stop Zurich

1:05 pm - 7:55 pmSOF Sofia-BOS Boston Logan Intl

13h 50m1 stop Zurich

$984SWISS

Thu, Oct 1 - Tue, Oct 6

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

20h 10m1 stop Munich Franz Josef Strauss

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

11h 45m1 stop Munich Franz Josef Strauss

$1,022Lufthansa

Mon, Sep 28 - Wed, Oct 7

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

20h 10m1 stop Munich Franz Josef Strauss

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

11h 45m1 stop Munich Franz Josef Strauss

$1,045Lufthansa

Tue, Sep 29 - Fri, Oct 9

2:15 pm - 3:20 pmBOS Boston Logan Intl-SOF Sofia

18h 05m2 stops Washington, D.C. Dulles Intl Vienna Intl

12:25 pm - 1:50 pmSOF Sofia-BOS Boston Logan Intl

32h 25m1 stop Vienna Intl

$1,046Austrian Airlines

Tue, Sep 29 - Thu, Oct 8

2:15 pm - 3:20 pmBOS Boston Logan Intl-SOF Sofia

18h 05m2 stops Washington, D.C. Dulles Intl Vienna Intl

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

12h 50m1 stop Vienna Intl

$1,046Austrian Airlines

Tue, Sep 29 - Fri, Oct 9

3:48 pm - 11:15 pmBOS Boston Logan Intl-SOF Sofia

24h 27m2 stops Newark Munich Franz Josef Strauss

8:00 am - 7:06 pmSOF Sofia-BOS Boston Logan Intl

18h 06m2 stops Vienna Intl Washington, D.C. Dulles Intl

$1,052United Airlines

Mon, Sep 28 - Fri, Oct 9

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

20h 10m1 stop Munich Franz Josef Strauss

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

11h 45m1 stop Munich Franz Josef Strauss

$1,422United Airlines

Mon, Sep 28 - Fri, Oct 2

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Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Feb 23

BOS6:55 pmBoston Logan Intl

9h 55m

1 stop

SOF11:50 amSofia

Mar 9

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$663

Austrian Airlines

Nov 3

BOS6:55 pmBoston Logan Intl

9h 55m

1 stop

SOF11:50 amSofia

Nov 17

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$671

Austrian Airlines

Nov 3

BOS6:55 pmBoston Logan Intl

9h 55m

1 stop

SOF11:50 amSofia

Nov 17

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$672

British Airways flights from Boston to Sofia

Our best British Airways deals on Boston to Sofia flight tickets

British Airways

Oct 11

BOS5:28 pmBoston Logan Intl

18h 52m

2 stops

SOF7:20 pmSofia

Nov 4

SOF9:05 pmSofia

26h 35m

2 stops

BOS4:40 pmBoston Logan Intl

$667

British Airways

Mar 22

BOS7:45 pmBoston Logan Intl

42h 25m

2 stops

SOF8:10 pmSofia

Apr 5

SOF8:10 pmSofia

29h 38m

2 stops

BOS6:48 pmBoston Logan Intl

$684

British Airways

Jan 24

BOS5:23 pmBoston Logan Intl

15h 57m

2 stops

SOF4:20 pmSofia

Feb 7

SOF7:45 pmSofia

28h 16m

2 stops

BOS5:01 pmBoston Logan Intl

$711

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 10/26

8:15 pm-5:00 pm

1 stop14h 45m

Sofia

Mon 11/9

10:40 am-5:40 pm

1 stop14h 00m

$624

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 10/26

8:15 pm-5:00 pm

1 stop14h 45m

Sofia

Mon 11/9

10:40 am-11:44 pm

2 stops20h 04m

$627

Quickest round-trip

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 2/23

6:55 pm-11:50 am

1 stop9h 55m

Sofia

Tue 3/9

7:55 am-1:30 pm

1 stop12h 35m

$663

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Sun 10/11

5:28 pm-7:20 pm

2 stops18h 52m

Sofia

Wed 11/4

9:05 pm-4:40 pm

2 stops26h 35m

$667

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/3

6:55 pm-11:50 am

1 stop9h 55m

Sofia

Tue 11/17

7:55 am-1:30 pm

1 stop12h 35m

$671

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 3/22

7:45 pm-8:10 pm

2 stops42h 25m

Sofia

Mon 4/5

8:10 pm-6:48 pm

2 stops29h 38m

$684

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Sun 1/10

8:40 pm-10:55 pm

1 stop19h 15m

Sofia

Wed 1/20

6:25 am-1:45 pm

1 stop14h 20m

$699

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/3

9:30 am-10:55 pm

2 stops30h 25m

Sofia

Tue 11/17

7:55 am-9:59 pm

2 stops21h 04m

$701

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 3/23

12:30 pm-1:15 pm

3 stops18h 45m

Sofia

Tue 4/6

8:00 am-5:25 pm

2 stops16h 25m

$706

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 1/25

8:40 pm-10:55 pm

1 stop19h 15m

Sofia

Mon 2/8

2:00 pm-6:35 pm

1 stop11h 35m

$717

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 $537 to $884.
The lowest price recently found on this route was $624.

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 $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 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 $717 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 56% 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 September 2026, prices for Boston to Sofia flights are approximately 54% 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

Best Price Found	$277
Fastest flight time	10h 35m
Direct flights	None

The best one-way flight to Sofia from Boston in the past 72 hours is $277. The best round-trip flight deal from Boston to Sofia found on momondo in the last 72 hours is $624.

The fastest flight from Boston to Sofia takes 10h 35m

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

Search flight deals

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 10h 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 September 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 35% of the total bookings. Other popular airlines include KLM with 16%, Turkish Airlines with 14%, and United Airlines with 8%.

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
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.5 973 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $394	Free Cancellation	Rating 7.4 10,242 reviews	Search United Airlines flights
Air France	PriceFrom $394	Free Cancellation	Rating 7.5 1,652 reviews	Search Air France flights
KLM	PriceFrom $403	Free Cancellation	Rating 7.8 1,578 reviews	Search KLM flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 2,083 reviews	Search SWISS flights
Lufthansa	PriceFrom $415	Free Cancellation	Rating 6.8 8,239 reviews	Search Lufthansa flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,236 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,459 reviews	Search Turkish Airlines flights
ITA Airways	PriceFrom $694	Free Cancellation	Rating 6.8 1,367 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 $277

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 11/8. 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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Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

British Airways flights from Boston to Sofia

Our best British Airways 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

Best Price Found

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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