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

Rome (FCO) was the most common stop: 25% of momondo users choosing 1-stop flights on this route connected there.

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 49% 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 38m.

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 connection time from Boston to Sofia?

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

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 June 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.

$303 Cheap Flights from Boston to Sofia in 2026

Q: 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 $520 to $975. The lowest price recently found on this route was $836.

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.

4:45 pm - 3:00 am

BOS

SOF

27h 15m

3 stops

7:30 pm - 2:45 pm

SOF

BOS

26h 15m

2 stops

$836Multiple Airlines

Thu, Aug 13 - Mon, Aug 31

8:50 pm - 12:50 am

BOS

SOF

21h 00m

2 stops

6:15 am - 8:20 pm

SOF

BOS

21h 05m

3 stops

$837Multiple Airlines

Sun, Sep 27 - Sun, Oct 18

8:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

10:30 am - 7:55 pm

SOF

BOS

16h 25m

2 stops

$838Multiple Airlines

Sun, Nov 22 - Sun, Dec 6

8:05 pm - 11:15 pm

BOS

SOF

20h 10m

1 stop

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$839United Airlines

Sun, Oct 18 - Fri, Oct 23

10:40 am - 3:45 pm

BOS

SOF

22h 05m

3 stops

10:00 pm - 5:50 pm

SOF

BOS

25h 50m

2 stops

$840Multiple Airlines

Tue, Sep 8 - Sun, Oct 25

12:36 pm - 11:40 am

BOS

SOF

16h 04m

2 stops

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$841Austrian Airlines

Fri, Oct 23 - Tue, Nov 17

9:51 am - 12:10 pm

BOS

SOF

19h 19m

2 stops

7:55 am - 2:30 pm

SOF

BOS

12h 35m

1 stop

$843United Airlines

Mon, Oct 19 - Tue, Oct 27

12:36 pm - 12:10 pm

BOS

SOF

16h 34m

2 stops

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$844United Airlines

Sun, Oct 18 - Wed, Oct 21

5:25 pm - 7:30 pm

BOS

SOF

19h 05m

2 stops

7:30 pm - 8:20 pm

SOF

BOS

31h 50m

2 stops

$845Multiple Airlines

Mon, Aug 17 - Mon, Aug 31

9:51 am - 12:10 pm

BOS

SOF

19h 19m

2 stops

6:00 am - 7:35 pm

SOF

BOS

19h 35m

1 stop

$846United Airlines

Mon, Oct 19 - Thu, Oct 29

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Turkish Airlines flights from Boston to Sofia

Our best Turkish Airlines deals on Boston to Sofia flight tickets

Turkish Airlines

Jul 9

BOS9:50 pmBoston Logan Intl

15h 30m

1 stop

SOF8:20 pmSofia

Jul 16

SOF9:35 amSofia

17h 20m

1 stop

BOS7:55 pmBoston Logan Intl

$844

Turkish Airlines

Sep 30

BOS9:50 pmBoston Logan Intl

27h 55m

1 stop

SOF8:45 amSofia

Oct 4

SOF1:05 pmSofia

13h 50m

1 stop

BOS7:55 pmBoston Logan Intl

$850

Turkish Airlines

Jul 9

BOS9:50 pmBoston Logan Intl

34h 10m

1 stop

SOF3:00 pmSofia

Jul 21

SOF9:35 amSofia

17h 20m

1 stop

BOS7:55 pmBoston Logan Intl

$852

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Oct 23

BOS12:36 pmBoston Logan Intl

16h 04m

2 stops

SOF11:40 amSofia

Nov 17

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$841

Austrian Airlines

Oct 23

BOS12:36 pmBoston Logan Intl

16h 04m

2 stops

SOF11:40 amSofia

Nov 17

SOF7:55 amSofia

17h 00m

2 stops

BOS5:55 pmBoston Logan Intl

$851

Austrian Airlines

Sep 15

BOS2:28 pmBoston Logan Intl

20h 42m

2 stops

SOF6:10 pmSofia

Sep 29

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$886

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 8/13

4:45 pm-3:00 am

3 stops27h 15m

Sofia

Mon 8/31

7:30 pm-2:45 pm

2 stops26h 15m

$836

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 9/27

8:50 pm-12:50 am

2 stops21h 00m

Sofia

Sun 10/18

6:15 am-8:20 pm

3 stops21h 05m

$837

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 11/22

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Sun 12/6

10:30 am-7:55 pm

2 stops16h 25m

$838

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/18

8:05 pm-11:15 pm

1 stop20h 10m

Sofia

Fri 10/23

8:00 am-1:50 pm

1 stop12h 50m

$839

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/8

10:40 am-3:45 pm

3 stops22h 05m

Sofia

Sun 10/25

10:00 pm-5:50 pm

2 stops25h 50m

$840

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 10/23

12:36 pm-11:40 am

2 stops16h 04m

Sofia

Tue 11/17

7:55 am-1:30 pm

1 stop12h 35m

$841

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 10/19

9:51 am-12:10 pm

2 stops19h 19m

Sofia

Tue 10/27

7:55 am-2:30 pm

1 stop12h 35m

$843

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/18

12:36 pm-12:10 pm

2 stops16h 34m

Sofia

Wed 10/21

8:00 am-1:50 pm

1 stop12h 50m

$844

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 8/17

5:25 pm-7:30 pm

2 stops19h 05m

Sofia

Mon 8/31

7:30 pm-8:20 pm

2 stops31h 50m

$845

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 10/19

9:51 am-12:10 pm

2 stops19h 19m

Sofia

Thu 10/29

6:00 am-7:35 pm

1 stop19h 35m

$846

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?

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 $636 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 57% 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 June 2026, prices for Boston to Sofia flights are approximately 37% 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 10m
Direct flights	None

The fastest flight from Boston to Sofia takes 12h 10m

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 12h 10m.
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 June 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 17%, Turkish Airlines with 11%, and United Airlines with 10%.

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 7.6 937 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $394	Free Cancellation	Rating 7.4 9,897 reviews	Search United Airlines flights
Lufthansa	PriceFrom $395	Free Cancellation	Rating 6.8 8,109 reviews	Search Lufthansa flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.5 1,615 reviews	Search Air France flights
KLM	PriceFrom $403	Free Cancellation	Rating 7.8 1,531 reviews	Search KLM flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 1,981 reviews	Search SWISS flights
British Airways	PriceFrom $421	Free Cancellation	Rating 6.7 8,085 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,428 reviews	Search Turkish Airlines flights
ITA Airways	PriceFrom $694	Free Cancellation	Rating 6.7 1,269 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.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Wed 7/29

Wed 8/5

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Bulgaria

Airlines

Cabin classes

Other Bulgaria destinations

Other flights from Boston

Complete your trip

Feeling lucky

Fly your favorite airline to Sofia

Cheap flights from Boston to Sofia from $338

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 7/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Boston to Sofia

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Turkish Airlines flights from Boston to Sofia

Our best Turkish Airlines deals on Boston to Sofia flight tickets

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

momondo Fare Finder

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 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

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

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

Fly to other destinations from Boston

According to popular flight searches on momondo this year

Complete your trip to Sofia

Explore popular destinations other users love

According to popular flight searches on momondo this year