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 02m.

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

Frankfurt am Main (FRA) was the most common stop: 46% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Boston to Sofia?

Vienna (VIE) has the shortest average layover time for this route: 1h 51m.

What airlines fly to Sofia?

Lufthansa, United Airlines 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 61% 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 offers the lowest fares from Boston to Sofia?

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $570.

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

Austrian Airlines, United Airlines, and Lufthansa are the most popular carriers operating from Boston Logan Intl to Sofia

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 December 2025, 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.

$347 Cheap Flights from Boston to Sofia in 2025/26

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2:20 pm - 1:15 pm

BOS

SOF

15h 55m2 stops

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$347Lufthansa

Wed, Jan 21 - Wed, Jan 28

8:40 pm - 6:20 pm

BOS

SOF

14h 40m1 stop

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$362Lufthansa

Wed, Jan 21 - Wed, Jan 28

10:15 am - 3:15 pm

BOS

SOF

22h 00m2 stops

7:55 am - 2:52 pm

SOF

BOS

37h 57m2 stops

$375Multiple Airlines

Wed, Jan 14 - Tue, Jan 27

9:50 pm - 3:15 pm

BOS

SOF

10h 25m1 stop

6:05 am - 6:02 pm

SOF

BOS

18h 57m2 stops

$385Multiple Airlines

Wed, Jan 21 - Wed, Jan 28

8:40 pm - 10:45 pm

BOS

SOF

19h 05m1 stop

2:15 pm - 10:02 am

SOF

BOS

26h 47m2 stops

$388Multiple Airlines

Wed, Jan 14 - Tue, Jan 27

9:50 pm - 3:15 pm

BOS

SOF

10h 25m1 stop

2:00 pm - 6:35 pm

SOF

BOS

11h 35m1 stop

$390Multiple Airlines

Wed, Jan 21 - Wed, Jan 28

8:40 pm - 10:45 pm

BOS

SOF

19h 05m1 stop

6:45 pm - 3:05 pm

SOF

BOS

26h 20m1 stop

$392Multiple Airlines

Mon, Mar 2 - Mon, Mar 16

2:20 pm - 1:15 pm

BOS

SOF

15h 55m2 stops

6:45 pm - 2:05 pm

SOF

BOS

26h 20m1 stop

$394Multiple Airlines

Tue, Feb 10 - Mon, Feb 23

6:30 pm - 2:05 pm

BOS

SOF

12h 35m1 stop

7:10 am - 1:40 pm

SOF

BOS

13h 30m1 stop

$396Air France

Wed, Jan 21 - Tue, Jan 27

1:30 pm - 1:55 pm

BOS

SOF

17h 25m2 stops

7:10 am - 1:40 pm

SOF

BOS

13h 30m1 stop

$400Air France

Tue, Jan 20 - Thu, Jan 29

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Jan 1

BOS6:01 amBoston Logan Intl

33h 44m

2 stops

SOF10:45 pmSofia

Jan 15

SOF6:05 amSofia

34h 57m

2 stops

BOS10:02 amBoston Logan Intl

$456

Find similar

United Airlines

Jan 11

BOS8:40 pmBoston Logan Intl

14h 40m

1 stop

SOF6:20 pmSofia

Jan 18

SOF7:55 amSofia

16h 19m

2 stops

BOS5:14 pmBoston Logan Intl

$459

Find similar

United Airlines

Jan 29

BOS8:40 pmBoston Logan Intl

19h 05m

1 stop

SOF10:45 pmSofia

Feb 2

SOF2:20 pmSofia

30h 15m

1 stop

BOS1:35 pmBoston Logan Intl

$474

Find similar

British Airways flights from Boston to Sofia

Our best British Airways deals on Boston to Sofia flight tickets

British Airways

Apr 2

BOS11:55 amBoston Logan Intl

18h 35m

2 stops

SOF1:30 pmSofia

Apr 13

SOF8:00 pmSofia

29h 52m

2 stops

BOS6:52 pmBoston Logan Intl

$483

Find similar

British Airways

Apr 2

BOS7:25 amBoston Logan Intl

23h 05m

1 stop

SOF1:30 pmSofia

Apr 13

SOF8:00 pmSofia

29h 52m

2 stops

BOS6:52 pmBoston Logan Intl

$486

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/21

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Wed 1/28

2:00 pm-6:35 pm

1 stop11h 35m

$347

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/21

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Wed 1/28

2:00 pm-6:35 pm

1 stop11h 35m

$362

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/14

10:15 am-3:15 pm

2 stops22h 00m

Sofia

Tue 1/27

7:55 am-2:52 pm

2 stops37h 57m

$375

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/21

9:50 pm-3:15 pm

1 stop10h 25m

Sofia

Wed 1/28

6:05 am-6:02 pm

2 stops18h 57m

$385

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/14

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Tue 1/27

2:15 pm-10:02 am

2 stops26h 47m

$388

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/21

9:50 pm-3:15 pm

1 stop10h 25m

Sofia

Wed 1/28

2:00 pm-6:35 pm

1 stop11h 35m

$390

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 3/2

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Mon 3/16

6:45 pm-3:05 pm

1 stop26h 20m

$392

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/10

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Mon 2/23

6:45 pm-2:05 pm

1 stop26h 20m

$394

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 1/21

6:30 pm-2:05 pm

1 stop12h 35m

Sofia

Tue 1/27

7:10 am-1:40 pm

1 stop13h 30m

$396

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/20

1:30 pm-1:55 pm

2 stops17h 25m

Sofia

Thu 1/29

7:10 am-1:40 pm

1 stop13h 30m

$400

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 October instead. Flights to Sofia in October, while not as cheap as those in November, still average around $532.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Tuesday is the cheapest day to fly to Sofia from Boston. The lowest ticket price found for a Tuesday departure recently was $843. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Boston to Sofia on a Friday will generally be more expensive and average around $997. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the evening is the cheapest time of day to fly from Boston to Sofia when you can find flight prices for as low as $816. Flying to Sofia in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,022 per ticket.

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 $707 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 $600 on momondo.

How have Boston to Sofia flight prices changed over time?

As of December 2025, prices for Boston to Sofia flights are approximately 16% 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	10h 25m
Direct flights	None

The fastest flight from Boston to Sofia takes 10h 25m

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 10h 25m.
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 December 2025, 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 50% of the total bookings. Other popular airlines include United Airlines with 13%, Turkish Airlines with 10%, and KLM 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 1,432 reviews	Search KLM flights
Air France	PriceFrom $416	Free Cancellation	Rating 7.4 1,504 reviews	Search Air France flights
Austrian Airlines	PriceFrom $422	Free Cancellation	Rating 7.6 879 reviews	Search Austrian Airlines flights
SWISS	PriceFrom $436	Free Cancellation	Rating 7.5 1,810 reviews	Search SWISS flights
United Airlines	PriceFrom $439	Free Cancellation	Rating 7.4 9,094 reviews	Search United Airlines flights
Lufthansa	PriceFrom $449	Free Cancellation	Rating 6.8 7,626 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 7,571 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,102 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $534	Free Cancellation	Rating 7.3 4,090 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 $347

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Sofia departing on 1/21. 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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United Airlines flights from Boston to Sofia

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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?

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight to Sofia?

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

How have Boston to Sofia flight prices changed over time?

As of December 2025, prices for Boston to Sofia flights are approximately 16% more expensive when compared to flights at the same time last year.

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

Austrian Airlines, United Airlines, and Lufthansa are the most popular carriers operating from Boston Logan Intl to Sofia

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: 46% 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 $570.

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 02m.

Which layover airport has the shortest connection time from Boston to Sofia?

Vienna (VIE) has the shortest average layover time for this route: 1h 51m.

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