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

Flights via Munich (MUC) offer the lowest average round-trip price of $680.

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 58% 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 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.

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

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

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

Frankfurt am Main (FRA) was the most common stop: 38% of momondo users choosing 1-stop flights on this route connected there.

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.

$246 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 $684 to $912. The lowest price recently found on this route was $441.

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Find the cheapest flights from Boston to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

8:40 pm - 6:20 pmBOS-SOF

14h 40m1 stop

2:00 pm - 6:35 pmSOF-BOS

11h 35m1 stop

$441Lufthansa

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Fri, Jan 16 - Fri, Jan 30

8:40 pm - 6:20 pmBOS-SOF

14h 40m1 stop

7:05 pm - 6:35 pmSOF-BOS

30h 30m1 stop

$445

Find Deal

Sun, Jan 18 - Sun, Feb 1

12:10 pm - 12:00 pmBOS-SOF

16h 50m2 stops

6:00 am - 5:40 pmSOF-BOS

18h 40m1 stop

$447United Airlines

Find Deal

Mon, Oct 6 - Tue, Oct 14

5:10 pm - 11:40 amBOS-SOF

11h 30m1 stop

12:45 pm - 5:40 pmSOF-BOS

11h 55m1 stop

$448United Airlines

Find Deal

Wed, Oct 1 - Thu, Oct 9

6:40 pm - 1:00 pmBOS-SOF

35h 20m2 stops

6:20 am - 9:25 pmSOF-BOS

22h 05m2 stops

$449Air Canada

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Sun, Aug 31 - Tue, Sep 30

9:40 pm - 10:05 amBOS-SOF

29h 25m1 stop

10:50 am - 3:25 pmSOF-BOS

11h 35m1 stop

$453SWISS

Find Deal

Thu, Oct 9 - Thu, Oct 23

12:10 pm - 11:55 pmBOS-SOF

28h 45m2 stops

8:00 am - 1:50 pmSOF-BOS

12h 50m1 stop

$457Austrian Airlines

Find Deal

Wed, Oct 1 - Wed, Oct 8

9:40 pm - 12:00 pmBOS-SOF

31h 20m2 stops

3:30 pm - 3:25 pmSOF-BOS

30h 55m1 stop

$463SWISS

Find Deal

Sun, Oct 5 - Mon, Oct 13

12:10 pm - 6:10 pmBOS-SOF

23h 00m2 stops

6:55 pm - 5:54 pmSOF-BOS

29h 59m2 stops

$468Austrian Airlines

Find Deal

Wed, Oct 1 - Tue, Oct 14

6:00 am - 6:40 pmBOS-SOF

29h 40m2 stops

1:50 pm - 9:30 amSOF-BOS

50h 40m2 stops

$470Air Canada

Find Deal

Sun, Oct 5 - Mon, Oct 13

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Oct 6

BOS12:10 pmBoston Logan Intl

16h 50m

2 stops

SOF12:00 pmSofia

Oct 14

SOF6:00 amSofia

18h 40m

1 stop

BOS5:40 pmBoston Logan Intl

$447

Find similar

United Airlines

Oct 1

BOS5:10 pmBoston Logan Intl

11h 30m

1 stop

SOF11:40 amSofia

Oct 9

SOF12:45 pmSofia

11h 55m

1 stop

BOS5:40 pmBoston Logan Intl

$448

Find similar

United Airlines

Jan 10

BOS7:55 pmBoston Logan Intl

39h 25m

2 stops

SOF6:20 pmSofia

Jan 31

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$452

Find similar

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Oct 1

BOS12:10 pmBoston Logan Intl

28h 45m

2 stops

SOF11:55 pmSofia

Oct 8

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$457

Find similar

Austrian Airlines

Oct 1

BOS12:10 pmBoston Logan Intl

23h 00m

2 stops

SOF6:10 pmSofia

Oct 14

SOF6:55 pmSofia

29h 59m

2 stops

BOS5:54 pmBoston Logan Intl

$468

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 1/16

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Fri 1/30

2:00 pm-6:35 pm

1 stop11h 35m

$441

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 1/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Sun 2/1

7:05 pm-6:35 pm

1 stop30h 30m

$445

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 10/6

12:10 pm-12:00 pm

2 stops16h 50m

Sofia

Tue 10/14

6:00 am-5:40 pm

1 stop18h 40m

$447

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Thu 10/9

12:45 pm-5:40 pm

1 stop11h 55m

$448

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 8/31

6:40 pm-1:00 pm

2 stops35h 20m

Sofia

Tue 9/30

6:20 am-9:25 pm

2 stops22h 05m

$449

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 10/9

9:40 pm-10:05 am

1 stop29h 25m

Sofia

Thu 10/23

10:50 am-3:25 pm

1 stop11h 35m

$453

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/1

12:10 pm-11:55 pm

2 stops28h 45m

Sofia

Wed 10/8

8:00 am-1:50 pm

1 stop12h 50m

$457

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/5

9:40 pm-12:00 pm

2 stops31h 20m

Sofia

Mon 10/13

3:30 pm-3:25 pm

1 stop30h 55m

$463

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/1

12:10 pm-6:10 pm

2 stops23h 00m

Sofia

Tue 10/14

6:55 pm-5:54 pm

2 stops29h 59m

$468

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/5

6:00 am-6:40 pm

2 stops29h 40m

Sofia

Mon 10/13

1:50 pm-9:30 am

2 stops50h 40m

$470

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 $585, 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 $810 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 $661 on momondo.

How have Boston to Sofia flight prices changed over time?

As of August 2025, prices for Boston to Sofia flights are approximately 6% 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	$246
Fastest flight time	11h 30m
Direct flights	None
Airports in Sofia	1 airport

The best one-way flight to Sofia from Boston in the past 72 hours is $246. The best round-trip flight deal from Boston to Sofia found on momondo in the last 72 hours is $441.

The fastest flight from Boston to Sofia takes 11h 30m

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 11h 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 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 15%, United Airlines with 12%, and KLM with 7%.

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 1,468 reviews	Search Air France flights
KLM	PriceFrom $432	Free Cancellation	Rating 7.8 1,385 reviews	Search KLM flights
SWISS	PriceFrom $437	Free Cancellation	Rating 7.6 1,699 reviews	Search SWISS flights
United Airlines	PriceFrom $505	Free Cancellation	Rating 7.4 8,925 reviews	Search United Airlines flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,019 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $507	Free Cancellation	Rating 7.3 3,945 reviews	Search Turkish Airlines flights
British Airways	PriceFrom $510	Free Cancellation	Rating 6.6 7,277 reviews	Search British Airways flights
Lufthansa	PriceFrom $570	Free Cancellation	Rating 6.8 7,330 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom $595	Free Cancellation	Rating 7.6 829 reviews	Search Austrian 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 $246

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 8/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

United Airlines flights from Boston to Sofia

Our best United Airlines 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 6% 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, 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: 38% 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 $680.

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