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: 11h 06m.

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

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $544.

What is the cheapest airline that flies from Boston Logan Intl to Sofia?

Lufthansa is the most popular carrier operating from Boston Logan Intl to Sofia

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

Frankfurt am Main (FRA) was the most common stop: 41% of momondo users choosing 1-stop flights on this route connected there.

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 60% 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 connection time from Boston to Sofia?

Vienna (VIE) has the shortest average layover time for this route: 1h 56m.

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 February 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.

$246 Cheap Flights from Boston to Sofia in 2026

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6:15 am - 12:10 pm

BOS

SOF

22h 55m

2 stops

12:55 pm - 5:40 pm

SOF

BOS

11h 45m

1 stop

$386Multiple Airlines

Tue, Apr 14 - Tue, Apr 28

9:40 pm - 10:20 am

BOS

SOF

29h 40m

1 stop

1:05 pm - 3:10 pm

SOF

BOS

33h 05m

1 stop

$390SWISS

Tue, Apr 14 - Tue, Apr 28

7:30 pm - 1:55 pm

BOS

SOF

12h 25m

1 stop

7:00 am - 1:33 pm

SOF

BOS

13h 33m

1 stop

$398Air France

Sun, Mar 22 - Tue, Apr 7

7:30 pm - 1:55 pm

BOS

SOF

12h 25m

1 stop

7:00 am - 3:09 pm

SOF

BOS

15h 09m

2 stops

$408Multiple Airlines

Sun, Mar 22 - Tue, Apr 7

12:10 pm - 1:15 pm

BOS

SOF

19h 05m

2 stops

8:00 am - 7:41 pm

SOF

BOS

18h 41m

2 stops

$409United Airlines

Tue, Mar 24 - Tue, Apr 7

4:35 pm - 2:00 pm

BOS

SOF

14h 25m

1 stop

7:00 am - 1:33 pm

SOF

BOS

13h 33m

1 stop

$410Multiple Airlines

Tue, Apr 7 - Tue, Apr 21

8:10 pm - 2:05 pm

BOS

SOF

11h 55m

1 stop

7:10 am - 2:30 pm

SOF

BOS

13h 20m

1 stop

$411Multiple Airlines

Tue, Mar 17 - Tue, Mar 24

1:57 pm - 1:15 pm

BOS

SOF

17h 18m

2 stops

6:00 am - 9:32 am

SOF

BOS

33h 32m

2 stops

$413United Airlines

Tue, Mar 17 - Tue, Mar 24

5:15 pm - 2:05 pm

BOS

SOF

14h 50m

2 stops

7:10 am - 2:30 pm

SOF

BOS

13h 20m

1 stop

$415Multiple Airlines

Tue, Mar 17 - Tue, Mar 24

1:00 pm - 12:10 pm

BOS

SOF

16h 10m

2 stops

6:10 am - 2:52 pm

SOF

BOS

15h 42m

2 stops

$417Multiple Airlines

Tue, Apr 14 - Tue, Apr 28

KLM flights from Boston to Sofia

Our best KLM deals on Boston to Sofia flight tickets

KLM

Apr 8

BOS4:35 pmBoston Logan Intl

14h 25m

1 stop

SOF2:00 pmSofia

Apr 15

SOF7:00 amSofia

15h 28m

2 stops

BOS3:28 pmBoston Logan Intl

$420

KLM

Mar 3

BOS7:10 pmBoston Logan Intl

11h 55m

1 stop

SOF2:05 pmSofia

Mar 14

SOF7:00 amSofia

13h 20m

1 stop

BOS2:20 pmBoston Logan Intl

$540

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Apr 19

BOS8:05 pmBoston Logan Intl

19h 55m

1 stop

SOF11:00 pmSofia

Apr 27

SOF7:00 pmSofia

29h 40m

2 stops

BOS5:40 pmBoston Logan Intl

$445

Lufthansa

Apr 22

BOS8:05 pmBoston Logan Intl

19h 45m

2 stops

SOF10:50 pmSofia

Apr 27

SOF7:25 pmSofia

29h 15m

1 stop

BOS5:40 pmBoston Logan Intl

$446

Lufthansa

Apr 2

BOS8:05 pmBoston Logan Intl

19h 55m

1 stop

SOF11:00 pmSofia

Apr 13

SOF7:25 pmSofia

29h 15m

1 stop

BOS5:40 pmBoston Logan Intl

$456

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/14

6:15 am-12:10 pm

2 stops22h 55m

Sofia

Tue 4/28

12:55 pm-5:40 pm

1 stop11h 45m

$386

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/14

9:40 pm-10:20 am

1 stop29h 40m

Sofia

Tue 4/28

1:05 pm-3:10 pm

1 stop33h 05m

$390

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/22

7:30 pm-1:55 pm

1 stop12h 25m

Sofia

Tue 4/7

7:00 am-1:33 pm

1 stop13h 33m

$398

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/22

7:30 pm-1:55 pm

1 stop12h 25m

Sofia

Tue 4/7

7:00 am-3:09 pm

2 stops15h 09m

$408

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/24

12:10 pm-1:15 pm

2 stops19h 05m

Sofia

Tue 4/7

8:00 am-7:41 pm

2 stops18h 41m

$409

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/7

4:35 pm-2:00 pm

1 stop14h 25m

Sofia

Tue 4/21

7:00 am-1:33 pm

1 stop13h 33m

$410

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

8:10 pm-2:05 pm

1 stop11h 55m

Sofia

Tue 3/24

7:10 am-2:30 pm

1 stop13h 20m

$411

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

1:57 pm-1:15 pm

2 stops17h 18m

Sofia

Tue 3/24

6:00 am-9:32 am

2 stops33h 32m

$413

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

5:15 pm-2:05 pm

2 stops14h 50m

Sofia

Tue 3/24

7:10 am-2:30 pm

1 stop13h 20m

$415

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/14

1:00 pm-12:10 pm

2 stops16h 10m

Sofia

Tue 4/28

6:10 am-2:52 pm

2 stops15h 42m

$417

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 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 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 $628 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 $612 on momondo.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 20% 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 February 2026, prices for Boston to Sofia flights are approximately 50% 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	12h 00m
Direct flights	None

The fastest flight from Boston to Sofia takes 12h 00m

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 12h 00m.
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 February 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 46% of the total bookings. Other popular airlines include United Airlines with 12%, KLM with 11%, and Turkish Airlines with 7%.

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 1,458 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 900 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,536 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.6 1,880 reviews	Search SWISS flights
United Airlines	PriceFrom $415	Free Cancellation	Rating 7.4 9,342 reviews	Search United Airlines flights
Lufthansa	PriceFrom $428	Free Cancellation	Rating 6.8 7,803 reviews	Search Lufthansa flights
British Airways	PriceFrom $478	Free Cancellation	Rating 6.7 7,759 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,151 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $527	Free Cancellation	Rating 7.3 4,233 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

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Cheap flights from Boston to Sofia from $246

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 4/27. 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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KLM flights from Boston to Sofia

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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?

How have Boston to Sofia flight prices changed over time?

What is the cheapest airline that flies from Boston Logan Intl to Sofia?

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

Find info about flight duration, direct flights, and airports for your flight from Boston to Sofia

Fastest flight time

Direct flights

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

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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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