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

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

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.

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

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

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 45% 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 July 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.

$301 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.

9:15 pm - 5:00 pm

BOS

SOF

12h 45m

1 stop

10:30 am - 7:55 pm

SOF

BOS

16h 25m

2 stops

$825Multiple Airlines

Fri, Jan 15 - Sun, Jan 24

5:50 pm - 5:00 pm

BOS

SOF

16h 10m

1 stop

10:30 am - 7:55 pm

SOF

BOS

16h 25m

2 stops

$829Multiple Airlines

Fri, Nov 6 - Sun, Nov 15

9:50 pm - 8:45 am

BOS

SOF

27h 55m

1 stop

9:10 pm - 7:55 pm

SOF

BOS

29h 45m

1 stop

$831Turkish Airlines

Tue, Sep 1 - Wed, Sep 30

9:50 pm - 8:45 am

BOS

SOF

27h 55m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$831Turkish Airlines

Tue, Sep 1 - Thu, Oct 1

12:00 pm - 1:15 pm

BOS

SOF

18h 15m

2 stops

7:55 am - 1:06 am

SOF

BOS

24h 11m

2 stops

$841United Airlines

Tue, Nov 24 - Fri, Dec 4

9:50 pm - 3:15 pm

BOS

SOF

10h 25m

1 stop

2:00 pm - 8:20 pm

SOF

BOS

37h 20m

2 stops

$844SWISS

Wed, Jan 20 - Tue, Jan 26

2:16 pm - 11:50 am

BOS

SOF

14h 34m

2 stops

12:35 pm - 6:49 pm

SOF

BOS

37h 14m

2 stops

$845Austrian Airlines

Tue, Jan 5 - Mon, Feb 22

6:55 pm - 11:50 am

BOS

SOF

9h 55m

1 stop

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$857Austrian Airlines

Sun, Dec 27 - Sun, Jan 10

7:40 pm - 10:45 pm

BOS

SOF

44h 05m

2 stops

2:00 pm - 6:35 pm

SOF

BOS

11h 35m

1 stop

$887United Airlines

Sat, Dec 26 - Sat, Jan 9

9:40 pm - 3:05 pm

BOS

SOF

10h 25m

1 stop

1:05 pm - 7:55 pm

SOF

BOS

13h 50m

1 stop

$891SWISS

Thu, Sep 3 - Tue, Sep 8

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United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Nov 24

BOS12:00 pmBoston Logan Intl

18h 15m

2 stops

SOF1:15 pmSofia

Dec 4

SOF7:55 amSofia

24h 11m

2 stops

BOS1:06 amBoston Logan Intl

$841

United Airlines

Oct 12

BOS12:30 pmBoston Logan Intl

16h 40m

2 stops

SOF12:10 pmSofia

Oct 23

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$890

United Airlines

Aug 7

BOS3:13 pmBoston Logan Intl

25h 02m

2 stops

SOF11:15 pmSofia

Aug 13

SOF6:10 amSofia

18h 30m

1 stop

BOS5:40 pmBoston Logan Intl

$942

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Jan 5

BOS2:16 pmBoston Logan Intl

14h 34m

2 stops

SOF11:50 amSofia

Feb 22

SOF12:35 pmSofia

37h 14m

2 stops

BOS6:49 pmBoston Logan Intl

$845

Austrian Airlines

Aug 11

BOS5:10 pmBoston Logan Intl

11h 30m

1 stop

SOF11:40 amSofia

Sep 7

SOF6:55 pmSofia

31h 24m

2 stops

BOS7:19 pmBoston Logan Intl

$860

Austrian Airlines

Jan 22

BOS2:16 pmBoston Logan Intl

14h 34m

2 stops

SOF11:50 amSofia

Feb 5

SOF7:55 amSofia

16h 30m

2 stops

BOS5:25 pmBoston Logan Intl

$863

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 1/15

9:15 pm-5:00 pm

1 stop12h 45m

Sofia

Sun 1/24

10:30 am-7:55 pm

2 stops16h 25m

$825

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 11/6

5:50 pm-5:00 pm

1 stop16h 10m

Sofia

Sun 11/15

10:30 am-7:55 pm

2 stops16h 25m

$829

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/1

9:50 pm-8:45 am

1 stop27h 55m

Sofia

Wed 9/30

9:10 pm-7:55 pm

1 stop29h 45m

$831

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/1

9:50 pm-8:45 am

1 stop27h 55m

Sofia

Thu 10/1

9:35 am-7:55 pm

1 stop17h 20m

$831

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 11/24

12:00 pm-1:15 pm

2 stops18h 15m

Sofia

Fri 12/4

7:55 am-1:06 am

2 stops24h 11m

$841

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/20

9:50 pm-3:15 pm

1 stop10h 25m

Sofia

Tue 1/26

2:00 pm-8:20 pm

2 stops37h 20m

$844

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/5

2:16 pm-11:50 am

2 stops14h 34m

Sofia

Mon 2/22

12:35 pm-6:49 pm

2 stops37h 14m

$845

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 12/27

6:55 pm-11:50 am

1 stop9h 55m

Sofia

Sun 1/10

7:55 am-1:30 pm

1 stop12h 35m

$857

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 12/26

7:40 pm-10:45 pm

2 stops44h 05m

Sofia

Sat 1/9

2:00 pm-6:35 pm

1 stop11h 35m

$887

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 9/3

9:40 pm-3:05 pm

1 stop10h 25m

Sofia

Tue 9/8

1:05 pm-7:55 pm

1 stop13h 50m

$891

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 high for flights on this route.

Typical prices usually range from $491 to $792.
The lowest price recently found on this route was $838.

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 $654 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 52% 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 July 2026, prices for Boston to Sofia flights are approximately 34% 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	9h 55m
Direct flights	None

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.

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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 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 July 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 32% of the total bookings. Other popular airlines include KLM with 18%, 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
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 949 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $394	Free Cancellation	Rating 7.4 10,043 reviews	Search United Airlines flights
Lufthansa	PriceFrom $395	Free Cancellation	Rating 6.8 8,161 reviews	Search Lufthansa flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.5 1,627 reviews	Search Air France flights
KLM	PriceFrom $403	Free Cancellation	Rating 7.8 1,550 reviews	Search KLM flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 2,017 reviews	Search SWISS flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,130 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,454 reviews	Search Turkish Airlines flights
ITA Airways	PriceFrom $694	Free Cancellation	Rating 6.7 1,299 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

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Cheap flights from Boston to Sofia from $299

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 8/25. 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

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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

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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.

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