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 38m.

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

Frankfurt am Main (FRA) was the most common stop: 24% of momondo users choosing 1-stop flights on this route connected there.

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 47% 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 August 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.

$309 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

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Cheap round-trip flights

Enter your travel dates to find the best prices.

9:50 pm - 3:00 pmBOS Boston Logan Intl-SOF Sofia

34h 10m1 stop Istanbul

4:00 pm - 7:05 pmSOF Sofia-BOS Boston Logan Intl

33h 05m1 stop Istanbul

$802Turkish Airlines

Wed, Oct 14 - Thu, Oct 29

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

30h 55m1 stop Istanbul

9:40 am - 7:05 pmSOF Sofia-BOS Boston Logan Intl

15h 25m1 stop Istanbul

$802Turkish Airlines

Wed, Oct 14 - Tue, Oct 27

12:00 pm - 6:00 pmBOS Boston Logan Intl-SOF Sofia

23h 00m2 stops Newark Vienna Intl

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

12h 35m1 stop Vienna Intl

$803Austrian Airlines

Tue, Nov 3 - Tue, Nov 17

3:30 pm - 1:15 pmBOS Boston Logan Intl-SOF Sofia

14h 45m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss

7:05 pm - 6:35 pmSOF Sofia-BOS Boston Logan Intl

30h 30m1 stop Munich Franz Josef Strauss

$806Multiple Airlines

Mon, Feb 22 - Mon, Mar 8

5:15 pm - 1:55 pmBOS Boston Logan Intl-SOF Sofia

13h 40m1 stop Dublin

8:20 pm - 11:02 amSOF Sofia-BOS Boston Logan Intl

45h 42m2 stops London Stansted Orlando

$806Multiple Airlines

Tue, Nov 24 - Tue, Dec 8

12:00 pm - 11:50 amBOS Boston Logan Intl-SOF Sofia

16h 50m2 stops Newark Vienna Intl

7:55 am - 5:27 pmSOF Sofia-BOS Boston Logan Intl

16h 32m2 stops Vienna Intl Newark

$813Austrian Airlines

Tue, Nov 3 - Tue, Nov 17

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

15h 35m1 stop Munich Franz Josef Strauss

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

12h 35m1 stop Vienna Intl

$821United Airlines

Sun, Oct 18 - Tue, Nov 3

4:05 pm - 1:25 pmBOS Boston Logan Intl-SOF Sofia

14h 20m1 stop Frankfurt am Main

6:00 am - 6:35 pmSOF Sofia-BOS Boston Logan Intl

19h 35m1 stop Munich Franz Josef Strauss

$822Lufthansa

Wed, Dec 30 - Wed, Jan 13

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

19h 15m1 stop Munich Franz Josef Strauss

6:00 am - 6:35 pmSOF Sofia-BOS Boston Logan Intl

19h 35m1 stop Munich Franz Josef Strauss

$825United Airlines

Sun, Dec 27 - Tue, Jan 12

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

19h 15m1 stop Munich Franz Josef Strauss

7:05 pm - 6:35 pmSOF Sofia-BOS Boston Logan Intl

30h 30m1 stop Munich Franz Josef Strauss

$832Lufthansa

Mon, Dec 28 - Mon, Jan 11

Cheap last minute flights

Enter your travel dates to find the best prices.

5:10 pm - 6:35 pmBOS Boston Logan Intl-SOF Sofia

18h 25m2 stops Zurich Krakow J. Paul II Balice

10:10 am - 9:05 pmSOF Sofia-BOS Boston Logan Intl

17h 55m1 stop Barcelona-El Prat

$995Multiple Airlines

Fri, Sep 4 - Thu, Sep 10

10:00 pm - 10:30 pmBOS Boston Logan Intl-SOF Sofia

17h 30m1 stop Frankfurt am Main

2:10 pm - 8:10 pmSOF Sofia-BOS Boston Logan Intl

13h 00m1 stop Frankfurt am Main

$1,030Lufthansa

Fri, Sep 4 - Fri, Sep 11

10:00 pm - 10:30 pmBOS Boston Logan Intl-SOF Sofia

17h 30m1 stop Frankfurt am Main

2:10 pm - 8:10 pmSOF Sofia-BOS Boston Logan Intl

13h 00m1 stop Frankfurt am Main

$1,030Lufthansa

Fri, Sep 4 - Thu, Sep 10

10:00 pm - 10:30 pmBOS Boston Logan Intl-SOF Sofia

17h 30m1 stop Frankfurt am Main

2:20 pm - 3:40 pmSOF Sofia-BOS Boston Logan Intl

32h 20m1 stop Frankfurt am Main

$1,045United Airlines

Fri, Sep 4 - Mon, Sep 14

5:10 pm - 12:10 pmBOS Boston Logan Intl-SOF Sofia

36h 00m2 stops Zurich Munich Franz Josef Strauss

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

30h 30m1 stop Zurich

$1,094SWISS

Fri, Sep 4 - Mon, Sep 14

12:41 pm - 11:55 pmBOS Boston Logan Intl-SOF Sofia

28h 14m2 stops Newark Vienna Intl

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

12h 50m1 stop Vienna Intl

$1,108Austrian Airlines

Fri, Sep 4 - Fri, Sep 11

12:41 pm - 11:55 pmBOS Boston Logan Intl-SOF Sofia

28h 14m2 stops Newark Vienna Intl

12:25 pm - 4:48 pmSOF Sofia-BOS Boston Logan Intl

35h 23m2 stops Vienna Intl Newark

$1,118Austrian Airlines

Fri, Sep 4 - Mon, Sep 14

5:10 pm - 12:10 pmBOS Boston Logan Intl-SOF Sofia

36h 00m2 stops Zurich Munich Franz Josef Strauss

1:45 pm - 7:55 pmSOF Sofia-BOS Boston Logan Intl

13h 10m1 stop Zurich

$1,154SWISS

Fri, Sep 4 - Sat, Sep 12

6:26 pm - 8:10 pmBOS Boston Logan Intl-SOF Sofia

42h 44m2 stops New York John F Kennedy Intl London Heathrow

2:15 pm - 11:28 pmSOF Sofia-BOS Boston Logan Intl

16h 13m2 stops London Heathrow New York John F Kennedy Intl

$1,196British Airways

Fri, Sep 4 - Fri, Sep 11

12:42 pm - 3:30 pmBOS Boston Logan Intl-SOF Sofia

19h 48m2 stops New York John F Kennedy Intl Belgrade Nikola Tesla

4:00 pm - 12:01 amSOF Sofia-BOS Boston Logan Intl

39h 01m2 stops Belgrade Nikola Tesla New York John F Kennedy Intl

$1,656Air Serbia

Fri, Sep 4 - Sat, Sep 12

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Air Canada flights from Boston to Sofia

Our best Air Canada deals on Boston to Sofia flight tickets

Air Canada

Dec 27

BOS5:30 amBoston Logan Intl

24h 45m

2 stops

SOF1:15 pmSofia

Jan 11

SOF2:00 pmSofia

55h 18m

2 stops

BOS2:18 pmBoston Logan Intl

$847

Air Canada

Sep 8

BOS3:35 pmBoston Logan Intl

20h 05m

2 stops

SOF6:40 pmSofia

Sep 11

SOF6:10 amSofia

39h 31m

2 stops

BOS2:41 pmBoston Logan Intl

$902

Air Canada

Sep 7

BOS6:00 amBoston Logan Intl

23h 10m

2 stops

SOF12:10 pmSofia

Sep 10

SOF6:10 amSofia

42h 57m

2 stops

BOS6:07 pmBoston Logan Intl

$907

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Oct 18

BOS8:05 pmBoston Logan Intl

15h 35m

1 stop

SOF6:40 pmSofia

Nov 3

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$821

United Airlines

Oct 18

BOS8:05 pmBoston Logan Intl

15h 35m

1 stop

SOF6:40 pmSofia

Nov 3

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$823

United Airlines

Dec 27

BOS8:40 pmBoston Logan Intl

19h 15m

1 stop

SOF10:55 pmSofia

Jan 12

SOF6:00 amSofia

19h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$825

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Wed 10/14

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Thu 10/29

4:00 pm-7:05 pm

1 stop33h 05m

$802

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Wed 10/14

9:50 pm-11:45 am

1 stop30h 55m

Sofia

Tue 10/27

9:40 am-7:05 pm

1 stop15h 25m

$802

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/3

12:00 pm-6:00 pm

2 stops23h 00m

Sofia

Tue 11/17

7:55 am-1:30 pm

1 stop12h 35m

$803

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 2/22

3:30 pm-1:15 pm

2 stops14h 45m

Sofia

Mon 3/8

7:05 pm-6:35 pm

1 stop30h 30m

$806

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/24

5:15 pm-1:55 pm

1 stop13h 40m

Sofia

Tue 12/8

8:20 pm-11:02 am

2 stops45h 42m

$806

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Tue 11/3

12:00 pm-11:50 am

2 stops16h 50m

Sofia

Tue 11/17

7:55 am-5:27 pm

2 stops16h 32m

$813

Quickest round-trip

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Sun 10/18

8:05 pm-6:40 pm

1 stop15h 35m

Sofia

Tue 11/3

7:55 am-1:30 pm

1 stop12h 35m

$821

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Wed 12/30

4:05 pm-1:25 pm

1 stop14h 20m

Sofia

Wed 1/13

6:00 am-6:35 pm

1 stop19h 35m

$822

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Sun 12/27

8:40 pm-10:55 pm

1 stop19h 15m

Sofia

Tue 1/12

6:00 am-6:35 pm

1 stop19h 35m

$825

BostonSofia

BOS Boston Logan Intl - SOF Sofia

BOSSOF

Boston Logan Intl

Mon 12/28

8:40 pm-10:55 pm

1 stop19h 15m

Sofia

Mon 1/11

7:05 pm-6:35 pm

1 stop30h 30m

$832

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 $495 to $995.
The lowest price recently found on this route was $802.

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 $448, 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 $687 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 60% 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

Best Price Found	$309
Fastest flight time	9h 55m
Direct flights	None

The best one-way flight to Sofia from Boston in the past 72 hours is $309. The best round-trip flight deal from Boston to Sofia found on momondo in the last 72 hours is $802.

The fastest flight from Boston to Sofia takes 9h 55m

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 9h 55m.
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 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 34% of the total bookings. Other popular airlines include KLM with 17%, Turkish Airlines with 12%, and Austrian 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
KLM	PriceFrom $380	Free Cancellation	Rating 7.8 1,568 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 948 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $394	Free Cancellation	Rating 7.4 10,139 reviews	Search United Airlines flights
Lufthansa	PriceFrom $396	Free Cancellation	Rating 6.8 8,228 reviews	Search Lufthansa flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.5 1,644 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 2,060 reviews	Search SWISS flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,196 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,478 reviews	Search Turkish Airlines flights
ITA Airways	PriceFrom $694	Free Cancellation	Rating 6.7 1,329 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 $309

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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Air Canada flights from Boston to Sofia

Our best Air Canada deals on Boston to Sofia flight tickets

United Airlines flights from Boston to Sofia

Our best United Airlines 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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