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

Amsterdam (AMS) was the most common stop: 30% 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 Zurich (ZRH) offer the lowest average round-trip price of $574.

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.

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 53% 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 May 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.

$248 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 $1,112 to $672. The lowest price recently found on this route was $795.

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

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

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.

8:05 pm - 11:15 pm

BOS

SOF

20h 10m

1 stop

6:10 am - 5:40 pm

SOF

BOS

18h 30m

1 stop

$795Lufthansa

Thu, Aug 20 - Sat, Sep 5

10:58 am - 12:10 pm

BOS

SOF

18h 12m

2 stops

6:10 am - 11:35 pm

SOF

BOS

24h 25m

2 stops

$799United Airlines

Wed, Jul 8 - Tue, Aug 25

8:05 pm - 11:15 pm

BOS

SOF

20h 10m

1 stop

12:55 pm - 5:40 pm

SOF

BOS

11h 45m

1 stop

$800Lufthansa

Sun, Aug 2 - Mon, Aug 10

12:41 pm - 12:10 pm

BOS

SOF

16h 29m

2 stops

6:10 am - 5:40 pm

SOF

BOS

18h 30m

1 stop

$801United Airlines

Thu, Aug 20 - Sat, Sep 5

6:50 pm - 6:00 pm

BOS

SOF

16h 10m

2 stops

6:10 am - 5:40 pm

SOF

BOS

18h 30m

1 stop

$802Multiple Airlines

Tue, Jul 7 - Tue, Aug 25

10:55 pm - 11:10 pm

BOS

SOF

17h 15m

2 stops

6:00 am - 9:05 pm

SOF

BOS

22h 05m

1 stop

$803Multiple Airlines

Wed, Jul 15 - Wed, Jul 29

8:05 pm - 6:40 pm

BOS

SOF

15h 35m

1 stop

8:00 am - 11:59 pm

SOF

BOS

22h 59m

2 stops

$804United Airlines

Sat, Aug 15 - Sat, Aug 29

10:00 pm - 6:00 pm

BOS

SOF

13h 00m

1 stop

8:00 am - 11:59 pm

SOF

BOS

22h 59m

2 stops

$806United Airlines

Tue, Jul 7 - Sat, Aug 29

5:45 pm - 11:15 pm

BOS

SOF

22h 30m

2 stops

7:25 pm - 5:40 pm

SOF

BOS

29h 15m

1 stop

$807Lufthansa

Sat, Jul 4 - Mon, Aug 24

12:41 pm - 12:10 pm

BOS

SOF

16h 29m

2 stops

8:00 am - 7:28 pm

SOF

BOS

18h 28m

2 stops

$808United Airlines

Thu, Aug 20 - Sat, Sep 5

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Oct 8

BOS6:00 amBoston Logan Intl

23h 10m

2 stops

SOF12:10 pmSofia

Oct 31

SOF6:25 amSofia

38h 05m

2 stops

BOS2:30 pmBoston Logan Intl

$791

United Airlines

Jul 8

BOS10:58 amBoston Logan Intl

18h 12m

2 stops

SOF12:10 pmSofia

Aug 25

SOF6:10 amSofia

24h 25m

2 stops

BOS11:35 pmBoston Logan Intl

$799

United Airlines

Aug 20

BOS12:41 pmBoston Logan Intl

16h 29m

2 stops

SOF12:10 pmSofia

Sep 5

SOF6:10 amSofia

18h 30m

1 stop

BOS5:40 pmBoston Logan Intl

$801

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Aug 20

BOS8:05 pmBoston Logan Intl

20h 10m

1 stop

SOF11:15 pmSofia

Sep 5

SOF6:10 amSofia

18h 30m

1 stop

BOS5:40 pmBoston Logan Intl

$795

Lufthansa

Aug 2

BOS8:05 pmBoston Logan Intl

20h 10m

1 stop

SOF11:15 pmSofia

Aug 10

SOF12:55 pmSofia

11h 45m

1 stop

BOS5:40 pmBoston Logan Intl

$800

Lufthansa

Jul 4

BOS5:45 pmBoston Logan Intl

22h 30m

2 stops

SOF11:15 pmSofia

Aug 24

SOF7:25 pmSofia

29h 15m

1 stop

BOS5:40 pmBoston Logan Intl

$807

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 8/20

8:05 pm-11:15 pm

1 stop20h 10m

Sofia

Sat 9/5

6:10 am-5:40 pm

1 stop18h 30m

$795

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 7/8

10:58 am-12:10 pm

2 stops18h 12m

Sofia

Tue 8/25

6:10 am-11:35 pm

2 stops24h 25m

$799

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 8/2

8:05 pm-11:15 pm

1 stop20h 10m

Sofia

Mon 8/10

12:55 pm-5:40 pm

1 stop11h 45m

$800

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 8/20

12:41 pm-12:10 pm

2 stops16h 29m

Sofia

Sat 9/5

6:10 am-5:40 pm

1 stop18h 30m

$801

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/7

6:50 pm-6:00 pm

2 stops16h 10m

Sofia

Tue 8/25

6:10 am-5:40 pm

1 stop18h 30m

$802

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 7/15

10:55 pm-11:10 pm

2 stops17h 15m

Sofia

Wed 7/29

6:00 am-9:05 pm

1 stop22h 05m

$803

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 8/15

8:05 pm-6:40 pm

1 stop15h 35m

Sofia

Sat 8/29

8:00 am-11:59 pm

2 stops22h 59m

$804

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/7

10:00 pm-6:00 pm

1 stop13h 00m

Sofia

Sat 8/29

8:00 am-11:59 pm

2 stops22h 59m

$806

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 7/4

5:45 pm-11:15 pm

2 stops22h 30m

Sofia

Mon 8/24

7:25 pm-5:40 pm

1 stop29h 15m

$807

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 8/20

12:41 pm-12:10 pm

2 stops16h 29m

Sofia

Sat 9/5

8:00 am-7:28 pm

2 stops18h 28m

$808

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 $638 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 55% 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 May 2026, prices for Boston to Sofia flights are approximately 3% 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	13h 30m
Direct flights	None

The fastest flight from Boston to Sofia takes 13h 30m

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 13h 30m.
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 May 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 40% of the total bookings. Other popular airlines include KLM with 16%, United Airlines with 10%, and Turkish 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 7.6 921 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $394	Free Cancellation	Rating 7.4 9,769 reviews	Search United Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,596 reviews	Search Air France flights
Lufthansa	PriceFrom $397	Free Cancellation	Rating 6.8 8,031 reviews	Search Lufthansa flights
KLM	PriceFrom $403	Free Cancellation	Rating 7.8 1,524 reviews	Search KLM flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 1,964 reviews	Search SWISS flights
British Airways	PriceFrom $430	Free Cancellation	Rating 6.7 8,014 reviews	Search British Airways flights
ITA Airways	PriceFrom $511	Free Cancellation	Rating 6.7 1,235 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,408 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

Tue 6/30

Tue 7/7

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 $248

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 8/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

Find the cheapest flights from Boston to Sofia

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

Lufthansa flights from Boston to Sofia

Our best Lufthansa 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