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

Frankfurt am Main (FRA) was the most common stop: 44% 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 $569.

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 airlines fly to Sofia?

Lufthansa, United Airlines and KLM 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 travel time from Boston to Sofia?

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

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.

$239 Cheap Flights from Boston to Sofia in 2026

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:25 pm - 11:50 am

BOS

SOF

10h 25m

1 stop

7:55 am - 5:21 pm

SOF

BOS

16h 26m

2 stops

$346Austrian Airlines

Tue, Feb 17 - Tue, Mar 3

8:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

6:45 pm - 2:05 pm

SOF

BOS

26h 20m

1 stop

$352Multiple Airlines

Mon, Feb 16 - Mon, Mar 2

8:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

12:55 pm - 5:40 pm

SOF

BOS

11h 45m

1 stop

$355Lufthansa

Wed, Mar 4 - Tue, May 5

7:25 pm - 11:50 am

BOS

SOF

10h 25m

1 stop

7:55 am - 3:05 pm

SOF

BOS

13h 10m

1 stop

$356Austrian Airlines

Tue, Mar 17 - Tue, Mar 24

5:20 pm - 12:15 pm

BOS

SOF

11h 55m

1 stop

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$361Multiple Airlines

Mon, Apr 20 - Wed, Apr 29

9:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

7:25 pm - 5:40 pm

SOF

BOS

29h 15m

1 stop

$366Lufthansa

Sun, Mar 15 - Mon, Mar 30

6:40 pm - 1:15 pm

BOS

SOF

12h 35m

2 stops

8:00 am - 5:57 pm

SOF

BOS

16h 57m

2 stops

$368Multiple Airlines

Wed, Mar 18 - Wed, Apr 1

6:40 pm - 1:15 pm

BOS

SOF

12h 35m

2 stops

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$369Multiple Airlines

Wed, Mar 18 - Wed, Apr 1

8:05 pm - 11:10 pm

BOS

SOF

20h 05m

1 stop

6:10 am - 10:38 pm

SOF

BOS

23h 28m

2 stops

$375Multiple Airlines

Sun, Apr 19 - Wed, Apr 29

7:25 pm - 11:50 am

BOS

SOF

10h 25m

1 stop

12:55 pm - 9:27 pm

SOF

BOS

15h 32m

2 stops

$376Multiple Airlines

Tue, Mar 17 - Tue, Mar 31

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Feb 17

BOS6:25 pmBoston Logan Intl

10h 25m

1 stop

SOF11:50 amSofia

Mar 3

SOF7:55 amSofia

16h 26m

2 stops

BOS5:21 pmBoston Logan Intl

$346

Austrian Airlines

Mar 17

BOS7:25 pmBoston Logan Intl

10h 25m

1 stop

SOF11:50 amSofia

Mar 24

SOF7:55 amSofia

13h 10m

1 stop

BOS3:05 pmBoston Logan Intl

$356

Austrian Airlines

Mar 4

BOS1:55 pmBoston Logan Intl

14h 55m

2 stops

SOF11:50 amSofia

May 5

SOF6:55 pmSofia

25h 55m

1 stop

BOS1:50 pmBoston Logan Intl

$389

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Mar 4

BOS8:40 pmBoston Logan Intl

14h 40m

1 stop

SOF6:20 pmSofia

May 5

SOF12:55 pmSofia

11h 45m

1 stop

BOS5:40 pmBoston Logan Intl

$355

Lufthansa

Mar 15

BOS9:40 pmBoston Logan Intl

14h 40m

1 stop

SOF6:20 pmSofia

Mar 30

SOF7:25 pmSofia

29h 15m

1 stop

BOS5:40 pmBoston Logan Intl

$366

Lufthansa

Apr 20

BOS7:30 pmBoston Logan Intl

20h 40m

2 stops

SOF11:10 pmSofia

Apr 29

SOF12:55 pmSofia

18h 04m

2 stops

BOS11:59 pmBoston Logan Intl

$395

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

6:25 pm-11:50 am

1 stop10h 25m

Sofia

Tue 3/3

7:55 am-5:21 pm

2 stops16h 26m

$346

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 2/16

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Mon 3/2

6:45 pm-2:05 pm

1 stop26h 20m

$352

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/4

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Tue 5/5

12:55 pm-5:40 pm

1 stop11h 45m

$355

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

7:25 pm-11:50 am

1 stop10h 25m

Sofia

Tue 3/24

7:55 am-3:05 pm

1 stop13h 10m

$356

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/20

5:20 pm-12:15 pm

1 stop11h 55m

Sofia

Wed 4/29

8:00 am-1:50 pm

1 stop12h 50m

$361

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/15

9:40 pm-6:20 pm

1 stop14h 40m

Sofia

Mon 3/30

7:25 pm-5:40 pm

1 stop29h 15m

$366

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/18

6:40 pm-1:15 pm

2 stops12h 35m

Sofia

Wed 4/1

8:00 am-5:57 pm

2 stops16h 57m

$368

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/18

6:40 pm-1:15 pm

2 stops12h 35m

Sofia

Wed 4/1

8:00 am-1:50 pm

1 stop12h 50m

$369

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 4/19

8:05 pm-11:10 pm

1 stop20h 05m

Sofia

Wed 4/29

6:10 am-10:38 pm

2 stops23h 28m

$375

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

7:25 pm-11:50 am

1 stop10h 25m

Sofia

Tue 3/31

12:55 pm-9:27 pm

2 stops15h 32m

$376

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 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 $663 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 $603 on momondo.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 13% 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 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	11h 55m
Direct flights	None

The fastest flight from Boston to Sofia takes 11h 55m

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 11h 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 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 48% of the total bookings. Other popular airlines include United Airlines with 12%, KLM with 9%, and Turkish 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 7.7 1,443 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.5 895 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,526 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.6 1,861 reviews	Search SWISS flights
United Airlines	PriceFrom $422	Free Cancellation	Rating 7.4 9,203 reviews	Search United Airlines flights
Lufthansa	PriceFrom $436	Free Cancellation	Rating 6.8 7,747 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 7,702 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,131 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $536	Free Cancellation	Rating 7.3 4,207 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 $239

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 2/9. 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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Big names and deals

Filter for what you want

Filter for what you want

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Price Alerts

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Find the cheapest flights from Boston to Sofia

Cheap round-trip flights

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Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

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Our best Lufthansa deals on Boston to Sofia flight tickets

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Use the filters below to find and compare flights from Boston to Sofia that are best for you.

See travel insights to Sofia from

How to get the cheapest flight ticket from Boston to Sofia

What is the cheapest month to fly to Sofia?

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

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 13% 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 January 2026, prices for Boston to Sofia flights are approximately 15% more expensive when compared to flights at the same time last year.

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: 44% 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 $569.

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