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

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $535.

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

United Airlines and SWISS are the most popular carriers operating from Boston Logan Intl to Sofia

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 58m.

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

Frankfurt am Main (FRA) was the most common stop: 34% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to Sofia?

Lufthansa, KLM and United 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 57% 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 52m.

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 April 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.

$340 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 low for flights on this route. Typical prices usually range from $936 to $488. The lowest price recently found on this route was $520.

1 adult

0 bags

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.

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$520Turkish Airlines

Mon, Apr 27 - Tue, May 12

9:50 pm - 3:00 pm

BOS

SOF

34h 10m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$533Turkish Airlines

Tue, Sep 15 - 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

$536Turkish Airlines

Wed, Aug 5 - Thu, Oct 1

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

10:05 am - 7:05 pm

SOF

BOS

15h 00m

1 stop

$537Turkish Airlines

Wed, Oct 14 - Wed, Oct 28

9:50 pm - 1:15 pm

BOS

SOF

32h 25m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$545Turkish Airlines

Wed, Sep 30 - Wed, Oct 21

9:50 pm - 8:45 am

BOS

SOF

27h 55m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$574Turkish Airlines

Mon, Oct 5 - Mon, Oct 19

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

10:05 am - 7:05 pm

SOF

BOS

15h 00m

1 stop

$577Turkish Airlines

Tue, Oct 13 - Tue, Oct 27

11:50 pm - 1:35 am

BOS

SOF

18h 45m

1 stop

6:45 pm - 9:15 pm

SOF

BOS

33h 30m

1 stop

$579Multiple Airlines

Sun, Oct 4 - Wed, Oct 21

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$582Turkish Airlines

Mon, Apr 27 - Tue, May 12

9:50 pm - 3:00 pm

BOS

SOF

34h 10m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$583Turkish Airlines

Tue, Sep 15 - Tue, Sep 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

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Aug 5

BOS12:30 pmBoston Logan Intl

27h 45m

2 stops

SOF11:15 pmSofia

Oct 1

SOF6:10 amSofia

18h 30m

1 stop

BOS5:40 pmBoston Logan Intl

$651

United Airlines

Oct 13

BOS12:30 pmBoston Logan Intl

16h 40m

2 stops

SOF12:10 pmSofia

Oct 30

SOF7:55 amSofia

12h 35m

1 stop

BOS2:30 pmBoston Logan Intl

$652

United Airlines

Aug 5

BOS12:30 pmBoston Logan Intl

27h 45m

2 stops

SOF11:15 pmSofia

Oct 1

SOF8:00 amSofia

20h 33m

2 stops

BOS9:33 pmBoston Logan Intl

$659

Turkish Airlines flights from Boston to Sofia

Our best Turkish Airlines deals on Boston to Sofia flight tickets

Turkish Airlines

Apr 27

BOS9:50 pmBoston Logan Intl

15h 25m

1 stop

SOF8:15 pmSofia

May 12

SOF3:50 pmSofia

35h 05m

1 stop

BOS7:55 pmBoston Logan Intl

$520

Turkish Airlines

Sep 15

BOS9:50 pmBoston Logan Intl

34h 10m

1 stop

SOF3:00 pmSofia

Sep 30

SOF3:50 pmSofia

35h 05m

1 stop

BOS7:55 pmBoston Logan Intl

$533

Turkish Airlines

Aug 5

BOS9:50 pmBoston Logan Intl

27h 55m

1 stop

SOF8:45 amSofia

Oct 1

SOF9:35 amSofia

17h 20m

1 stop

BOS7:55 pmBoston Logan Intl

$536

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/27

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Tue 5/12

3:50 pm-7:55 pm

1 stop35h 05m

$520

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/15

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Wed 9/30

3:50 pm-7:55 pm

1 stop35h 05m

$533

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 8/5

9:50 pm-8:45 am

1 stop27h 55m

Sofia

Thu 10/1

9:35 am-7:55 pm

1 stop17h 20m

$536

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/14

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Wed 10/28

10:05 am-7:05 pm

1 stop15h 00m

$537

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 9/30

9:50 pm-1:15 pm

1 stop32h 25m

Sofia

Wed 10/21

3:50 pm-7:55 pm

1 stop35h 05m

$545

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 10/5

9:50 pm-8:45 am

1 stop27h 55m

Sofia

Mon 10/19

3:50 pm-7:55 pm

1 stop35h 05m

$574

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 10/13

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Tue 10/27

10:05 am-7:05 pm

1 stop15h 00m

$577

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/4

11:50 pm-1:35 am

1 stop18h 45m

Sofia

Wed 10/21

6:45 pm-9:15 pm

1 stop33h 30m

$579

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/27

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Tue 5/12

3:50 pm-7:55 pm

1 stop35h 05m

$582

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/15

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Tue 9/29

9:35 am-7:55 pm

1 stop17h 20m

$583

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 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 $623 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 $493 on momondo.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 48% 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 April 2026, prices for Boston to Sofia flights are approximately 16% 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	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

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 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 April 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 42% of the total bookings. Other popular airlines include KLM with 13%, United Airlines with 12%, 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 7.8 1,499 reviews	Search KLM flights
SWISS	PriceFrom $388	Free Cancellation	Rating 7.6 1,922 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 902 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,572 reviews	Search Air France flights
United Airlines	PriceFrom $415	Free Cancellation	Rating 7.4 9,602 reviews	Search United Airlines flights
Lufthansa	PriceFrom $418	Free Cancellation	Rating 6.8 7,926 reviews	Search Lufthansa flights
British Airways	PriceFrom $478	Free Cancellation	Rating 6.7 7,888 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,188 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.3 4,306 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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Sun 5/17

Sun 5/24

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 $340

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 9/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

Turkish Airlines flights from Boston to Sofia

Our best Turkish 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 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

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