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

Flights via Munich (MUC) offer the lowest average round-trip price of $681.

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

Frankfurt am Main (FRA) was the most common stop: 45% of momondo users choosing 1-stop flights on this route connected there.

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

United Airlines and British Airways 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: 11h 06m.

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 November 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.

$310 Cheap Flights from Boston to Sofia in 2025/26

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 $600 to $1,203. The lowest price recently found on this route was $365.

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2:20 pm - 1:15 pmBOS-SOF

15h 55m2 stops

2:20 pm - 1:35 pmSOF-BOS

30h 15m1 stop

$365Lufthansa

Find Deal

Mon, Jan 12 - Mon, Jan 26

1:00 pm - 6:20 pmBOS-SOF

22h 20m2 stops

7:55 am - 2:05 pmSOF-BOS

13h 10m1 stop

$377Multiple Airlines

Find Deal

Tue, Feb 17 - Tue, Mar 3

8:40 pm - 6:20 pmBOS-SOF

14h 40m1 stop

7:55 am - 2:05 pmSOF-BOS

13h 10m1 stop

$378Multiple Airlines

Find Deal

Tue, Feb 17 - Tue, Mar 3

9:50 pm - 3:15 pmBOS-SOF

10h 25m1 stop

7:55 am - 3:05 pmSOF-BOS

13h 10m1 stop

$379Multiple Airlines

Find Deal

Wed, Feb 25 - Tue, Mar 17

8:40 pm - 10:45 pmBOS-SOF

19h 05m1 stop

2:20 pm - 1:35 pmSOF-BOS

30h 15m1 stop

$380Lufthansa

Find Deal

Mon, Jan 12 - Mon, Jan 26

2:20 pm - 6:20 pmBOS-SOF

21h 00m2 stops

7:55 am - 3:05 pmSOF-BOS

13h 10m1 stop

$384Multiple Airlines

Find Deal

Wed, Feb 25 - Tue, Mar 17

7:07 pm - 10:45 pmBOS-SOF

20h 38m2 stops

2:00 pm - 6:35 pmSOF-BOS

11h 35m1 stop

$388Lufthansa

Find Deal

Thu, Jan 8 - Thu, Jan 22

1:57 pm - 11:50 amBOS-SOF

15h 53m2 stops

8:00 am - 1:50 pmSOF-BOS

12h 50m1 stop

$389Austrian Airlines

Find Deal

Mon, Mar 23 - Mon, Apr 6

2:20 pm - 1:15 pmBOS-SOF

15h 55m2 stops

7:55 am - 7:08 pmSOF-BOS

17h 13m2 stops

$391Multiple Airlines

Find Deal

Wed, Feb 25 - Tue, Mar 17

8:05 pm - 11:10 pmBOS-SOF

20h 05m1 stop

6:10 am - 9:20 pmSOF-BOS

22h 10m2 stops

$392Multiple Airlines

Find Deal

Wed, Apr 22 - Wed, May 6

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Jan 12

BOS2:20 pmBoston Logan Intl

15h 55m

2 stops

SOF1:15 pmSofia

Jan 26

SOF2:20 pmSofia

30h 15m

1 stop

BOS1:35 pmBoston Logan Intl

$365

Find similar

Lufthansa

Jan 12

BOS8:40 pmBoston Logan Intl

19h 05m

1 stop

SOF10:45 pmSofia

Jan 26

SOF2:20 pmSofia

30h 15m

1 stop

BOS1:35 pmBoston Logan Intl

$380

Find similar

Lufthansa

Jan 8

BOS7:07 pmBoston Logan Intl

20h 38m

2 stops

SOF10:45 pmSofia

Jan 22

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$388

Find similar

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Mar 23

BOS1:57 pmBoston Logan Intl

15h 53m

2 stops

SOF11:50 amSofia

Apr 6

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$389

Find similar

Austrian Airlines

Jan 11

BOS6:25 pmBoston Logan Intl

10h 25m

1 stop

SOF11:50 amSofia

Jan 25

SOF7:55 amSofia

16h 19m

2 stops

BOS5:14 pmBoston Logan Intl

$396

Find similar

Austrian Airlines

Dec 17

BOS2:15 pmBoston Logan Intl

26h 40m

2 stops

SOF11:55 pmSofia

Feb 17

SOF7:55 amSofia

16h 26m

2 stops

BOS5:21 pmBoston Logan Intl

$463

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 1/12

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Mon 1/26

2:20 pm-1:35 pm

1 stop30h 15m

$365

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

1:00 pm-6:20 pm

2 stops22h 20m

Sofia

Tue 3/3

7:55 am-2:05 pm

1 stop13h 10m

$377

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Tue 3/3

7:55 am-2:05 pm

1 stop13h 10m

$378

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/25

9:50 pm-3:15 pm

1 stop10h 25m

Sofia

Tue 3/17

7:55 am-3:05 pm

1 stop13h 10m

$379

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 1/12

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Mon 1/26

2:20 pm-1:35 pm

1 stop30h 15m

$380

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/25

2:20 pm-6:20 pm

2 stops21h 00m

Sofia

Tue 3/17

7:55 am-3:05 pm

1 stop13h 10m

$384

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 1/8

7:07 pm-10:45 pm

2 stops20h 38m

Sofia

Thu 1/22

2:00 pm-6:35 pm

1 stop11h 35m

$388

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 3/23

1:57 pm-11:50 am

2 stops15h 53m

Sofia

Mon 4/6

8:00 am-1:50 pm

1 stop12h 50m

$389

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/25

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Tue 3/17

7:55 am-7:08 pm

2 stops17h 13m

$391

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/22

8:05 pm-11:10 pm

1 stop20h 05m

Sofia

Wed 5/6

6:10 am-9:20 pm

2 stops22h 10m

$392

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 October. Flight prices, which tend to average around $532, 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 January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $578.

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 $756 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 $665 on momondo.

How have Boston to Sofia flight prices changed over time?

As of November 2025, 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

Direct flights	None

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 November 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 Turkish Airlines with 12%, 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
KLM	PriceFrom $407	Free Cancellation	Rating 7.7 1,412 reviews	Search KLM flights
Air France	PriceFrom $416	Free Cancellation	Rating 7.4 1,493 reviews	Search Air France flights
SWISS	PriceFrom $436	Free Cancellation	Rating 7.5 1,788 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $447	Free Cancellation	Rating 7.6 874 reviews	Search Austrian Airlines flights
Lufthansa	PriceFrom $451	Free Cancellation	Rating 6.8 7,577 reviews	Search Lufthansa flights
United Airlines	PriceFrom $472	Free Cancellation	Rating 7.4 9,020 reviews	Search United Airlines flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,086 reviews	Search ITA Airways flights
British Airways	PriceFrom $510	Free Cancellation	Rating 6.7 7,533 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $520	Free Cancellation	Rating 7.3 4,047 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 $310

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 12/11. 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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Big names and deals

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Filter for what you want

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Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

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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 November 2025, prices for Boston to Sofia flights are approximately 3% cheaper when compared to flights at the same time last year.

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

United Airlines and British Airways 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: 45% 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 $681.

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 06m.

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 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

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