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.

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

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

What airlines fly to Sofia?

Lufthansa, Turkish Airlines 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 airport is the most popular layover for flights between Boston and Sofia?

Frankfurt am Main (FRA) was the most common stop: 39% 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.

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

Flights via Munich (MUC) offer the lowest average round-trip price of $655.

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 August 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.

$285 Cheap Flights from Boston to Sofia in 2025

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 $695 to $914. The lowest price recently found on this route was $363.

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Find the cheapest flights from Boston to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

6:25 pm - 11:50 amBOS-SOF

10h 25m1 stop

7:55 am - 2:05 pmSOF-BOS

13h 10m1 stop

$363Austrian Airlines

Find Deal

Tue, Feb 3 - Tue, Feb 17

6:25 pm - 11:50 amBOS-SOF

10h 25m1 stop

7:55 am - 2:05 pmSOF-BOS

13h 10m1 stop

$364Austrian Airlines

Find Deal

Tue, Jan 6 - Tue, Jan 20

9:50 pm - 3:15 pmBOS-SOF

10h 25m1 stop

1:55 pm - 6:35 pmSOF-BOS

11h 40m1 stop

$368

Find Deal

Wed, Dec 3 - Wed, Dec 17

9:50 pm - 6:20 pmBOS-SOF

13h 30m2 stops

7:55 am - 2:05 pmSOF-BOS

13h 10m1 stop

$371

Find Deal

Tue, Nov 4 - Tue, Nov 18

9:40 pm - 10:05 amBOS-SOF

29h 25m1 stop

1:15 pm - 7:55 pmSOF-BOS

13h 40m1 stop

$388SWISS

Find Deal

Tue, Aug 26 - Tue, Sep 9

12:25 pm - 6:20 pmBOS-SOF

22h 55m2 stops

6:05 am - 6:35 pmSOF-BOS

19h 30m1 stop

$396United Airlines

Find Deal

Tue, Nov 4 - Tue, Nov 18

4:45 pm - 12:00 pmBOS-SOF

36h 15m2 stops

6:05 am - 6:35 pmSOF-BOS

19h 30m1 stop

$398United Airlines

Find Deal

Sat, Oct 18 - Tue, Nov 4

5:05 pm - 12:30 pmBOS-SOF

12h 25m1 stop

1:15 pm - 7:55 pmSOF-BOS

13h 40m1 stop

$399SWISS

Find Deal

Mon, Aug 25 - Tue, Sep 9

8:40 pm - 10:45 pmBOS-SOF

19h 05m1 stop

7:05 pm - 6:35 pmSOF-BOS

30h 30m1 stop

$400Lufthansa

Find Deal

Mon, Dec 8 - Mon, Dec 22

8:05 pm - 6:40 pmBOS-SOF

15h 35m1 stop

6:00 am - 5:40 pmSOF-BOS

18h 40m1 stop

$441Lufthansa

Find Deal

Sun, Aug 31 - Tue, Sep 30

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Dec 8

BOS8:40 pmBoston Logan Intl

19h 05m

1 stop

SOF10:45 pmSofia

Dec 22

SOF7:05 pmSofia

30h 30m

1 stop

BOS6:35 pmBoston Logan Intl

$400

Find similar

Lufthansa

Aug 17

BOS8:05 pmBoston Logan Intl

19h 55m

1 stop

SOF11:00 pmSofia

Sep 4

SOF6:00 amSofia

18h 40m

1 stop

BOS5:40 pmBoston Logan Intl

$416

Find similar

Lufthansa

Aug 31

BOS8:05 pmBoston Logan Intl

15h 35m

1 stop

SOF6:40 pmSofia

Sep 30

SOF6:00 amSofia

18h 40m

1 stop

BOS5:40 pmBoston Logan Intl

$441

Find similar

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Feb 3

BOS6:25 pmBoston Logan Intl

10h 25m

1 stop

SOF11:50 amSofia

Feb 17

SOF7:55 amSofia

13h 10m

1 stop

BOS2:05 pmBoston Logan Intl

$363

Find similar

Austrian Airlines

Jan 6

BOS6:25 pmBoston Logan Intl

10h 25m

1 stop

SOF11:50 amSofia

Jan 20

SOF7:55 amSofia

13h 10m

1 stop

BOS2:05 pmBoston Logan Intl

$364

Find similar

Austrian Airlines

Nov 4

BOS6:25 pmBoston Logan Intl

16h 35m

1 stop

SOF6:00 pmSofia

Nov 18

SOF7:55 amSofia

13h 10m

1 stop

BOS2:05 pmBoston Logan Intl

$372

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/3

6:25 pm-11:50 am

1 stop10h 25m

Sofia

Tue 2/17

7:55 am-2:05 pm

1 stop13h 10m

$363

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/6

6:25 pm-11:50 am

1 stop10h 25m

Sofia

Tue 1/20

7:55 am-2:05 pm

1 stop13h 10m

$364

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 12/3

9:50 pm-3:15 pm

1 stop10h 25m

Sofia

Wed 12/17

1:55 pm-6:35 pm

1 stop11h 40m

$368

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 11/4

9:50 pm-6:20 pm

2 stops13h 30m

Sofia

Tue 11/18

7:55 am-2:05 pm

1 stop13h 10m

$371

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 8/26

9:40 pm-10:05 am

1 stop29h 25m

Sofia

Tue 9/9

1:15 pm-7:55 pm

1 stop13h 40m

$388

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 11/4

12:25 pm-6:20 pm

2 stops22h 55m

Sofia

Tue 11/18

6:05 am-6:35 pm

1 stop19h 30m

$396

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 10/18

4:45 pm-12:00 pm

2 stops36h 15m

Sofia

Tue 11/4

6:05 am-6:35 pm

1 stop19h 30m

$398

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 8/25

5:05 pm-12:30 pm

1 stop12h 25m

Sofia

Tue 9/9

1:15 pm-7:55 pm

1 stop13h 40m

$399

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 12/8

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Mon 12/22

7:05 pm-6:35 pm

1 stop30h 30m

$400

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 8/31

8:05 pm-6:40 pm

1 stop15h 35m

Sofia

Tue 9/30

6:00 am-5:40 pm

1 stop18h 40m

$441

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 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 October. Flight prices, which tend to average around $578, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from Boston during November instead. Flights to Sofia in November, while not as cheap as those in October, still average around $666.

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 $818 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 $660 on momondo.

How have Boston to Sofia flight prices changed over time?

As of August 2025, prices for Boston to Sofia flights are approximately 7% 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

Best Price Found	$285
Fastest flight time	10h 25m
Direct flights	None
Airports in Sofia	1 airport

The best one-way flight to Sofia from Boston in the past 72 hours is $285. The best round-trip flight deal from Boston to Sofia found on momondo in the last 72 hours is $363.

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

There are no direct flights from Boston to Sofia. Popular non-direct route for this connection is Boston Logan Intl Airport - Sofia Airport.

There is 1 airport near Sofia: Sofia (SOF)

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 August 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 47% of the total bookings. Other popular airlines include Turkish Airlines with 16%, United Airlines with 12%, 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
Air France	PriceFrom $416	Free Cancellation	Rating 7.4 1,465 reviews	Search Air France flights
KLM	PriceFrom $432	Free Cancellation	Rating 7.8 1,381 reviews	Search KLM flights
SWISS	PriceFrom $437	Free Cancellation	Rating 7.6 1,690 reviews	Search SWISS flights
United Airlines	PriceFrom $505	Free Cancellation	Rating 7.4 8,917 reviews	Search United Airlines flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,011 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $509	Free Cancellation	Rating 7.3 3,932 reviews	Search Turkish Airlines flights
British Airways	PriceFrom $510	Free Cancellation	Rating 6.6 7,251 reviews	Search British Airways flights
Lufthansa	PriceFrom $572	Free Cancellation	Rating 6.8 7,289 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom $637	Free Cancellation	Rating 7.6 824 reviews	Search Austrian Airlines flights

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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 $285

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 8/30. 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

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Price Alerts

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Find the cheapest flights from Boston to Sofia

Cheap round-trip flights

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Cheap last minute flights

Lufthansa flights from Boston to Sofia

Our best Lufthansa 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

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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

What is the typical price of a round-trip flight between Boston and 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 August 2025, prices for Boston to Sofia flights are approximately 7% cheaper when compared to flights at the same time last year.

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

ITA Airways and United Airlines 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: 39% 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 Munich (MUC) offer the lowest average round-trip price of $655.

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

Best Price Found

Fastest flight time

Direct flights

Airports in Sofia

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