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

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

What airlines fly to Sofia?

Lufthansa, United Airlines and KLM 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 63% 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 $569.

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 has the shortest travel time from Boston to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 10h 54m.

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

Vienna (VIE) has the shortest average layover time for this route: 1h 49m.

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 January 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.

$144 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 $427 to $666. The lowest price recently found on this route was $350.

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Find the cheapest flights from Boston to Sofia

Round-trip

One-way

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Cheap round-trip flights

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9:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

7:55 am - 3:05 pm

SOF

BOS

13h 10m

1 stop

$350Multiple Airlines

Tue, Mar 17 - Tue, Mar 24

8:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$354Multiple Airlines

Sun, Mar 1 - Wed, Apr 1

6:25 pm - 11:55 pm

BOS

SOF

22h 30m

1 stop

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$357Austrian Airlines

Sun, Mar 1 - Wed, Apr 1

1:00 pm - 6:20 pm

BOS

SOF

22h 20m

2 stops

8:00 am - 5:57 pm

SOF

BOS

16h 57m

2 stops

$363Multiple Airlines

Sun, Mar 1 - Wed, Apr 1

6:25 pm - 11:50 am

BOS

SOF

10h 25m

1 stop

8:00 am - 5:57 pm

SOF

BOS

16h 57m

2 stops

$371Multiple Airlines

Sun, Mar 1 - Wed, Apr 1

10:50 pm - 6:20 pm

BOS

SOF

13h 30m

2 stops

7:55 am - 3:05 pm

SOF

BOS

13h 10m

1 stop

$376Multiple Airlines

Tue, Mar 17 - Tue, Mar 24

8:05 pm - 11:10 pm

BOS

SOF

20h 05m

1 stop

12:55 pm - 10:38 pm

SOF

BOS

16h 43m

2 stops

$377Multiple Airlines

Sun, Apr 19 - Wed, Apr 29

10:50 pm - 6:20 pm

BOS

SOF

13h 30m

2 stops

7:55 am - 3:05 pm

SOF

BOS

13h 10m

1 stop

$379Multiple Airlines

Tue, Mar 17 - Tue, Mar 24

8:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

6:55 pm - 1:50 pm

SOF

BOS

25h 55m

1 stop

$383Multiple Airlines

Wed, Mar 4 - Tue, May 5

5:30 am - 11:10 pm

BOS

SOF

34h 40m

2 stops

11:30 am - 9:54 am

SOF

BOS

29h 24m

2 stops

$386Multiple Airlines

Wed, Apr 8 - Thu, Apr 30

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Mar 10

BOS12:07 pmBoston Logan Intl

24h 13m

3 stops

SOF6:20 pmSofia

Mar 17

SOF7:55 amSofia

36h 36m

2 stops

BOS2:31 pmBoston Logan Intl

$409

United Airlines

Apr 4

BOS6:40 pmBoston Logan Intl

35h 55m

2 stops

SOF1:35 pmSofia

Apr 13

SOF12:55 pmSofia

38h 00m

2 stops

BOS7:55 pmBoston Logan Intl

$441

United Airlines

Apr 4

BOS6:40 pmBoston Logan Intl

35h 55m

2 stops

SOF1:35 pmSofia

Apr 13

SOF12:55 pmSofia

37h 11m

2 stops

BOS7:06 pmBoston Logan Intl

$443

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Mar 1

BOS6:25 pmBoston Logan Intl

22h 30m

1 stop

SOF11:55 pmSofia

Apr 1

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$357

Austrian Airlines

Feb 8

BOS1:24 pmBoston Logan Intl

15h 26m

2 stops

SOF11:50 amSofia

Feb 24

SOF7:55 amSofia

13h 10m

1 stop

BOS2:05 pmBoston Logan Intl

$389

Austrian Airlines

Feb 8

BOS1:24 pmBoston Logan Intl

15h 26m

2 stops

SOF11:50 amSofia

Feb 24

SOF7:55 amSofia

16h 26m

2 stops

BOS5:21 pmBoston Logan Intl

$396

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

9:40 pm-6:20 pm

1 stop14h 40m

Sofia

Tue 3/24

7:55 am-3:05 pm

1 stop13h 10m

$350

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/1

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Wed 4/1

8:00 am-1:50 pm

1 stop12h 50m

$354

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/1

6:25 pm-11:55 pm

1 stop22h 30m

Sofia

Wed 4/1

8:00 am-1:50 pm

1 stop12h 50m

$357

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/1

1:00 pm-6:20 pm

2 stops22h 20m

Sofia

Wed 4/1

8:00 am-5:57 pm

2 stops16h 57m

$363

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/1

6:25 pm-11:50 am

1 stop10h 25m

Sofia

Wed 4/1

8:00 am-5:57 pm

2 stops16h 57m

$371

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

10:50 pm-6:20 pm

2 stops13h 30m

Sofia

Tue 3/24

7:55 am-3:05 pm

1 stop13h 10m

$376

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 4/19

8:05 pm-11:10 pm

1 stop20h 05m

Sofia

Wed 4/29

12:55 pm-10:38 pm

2 stops16h 43m

$377

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/17

10:50 pm-6:20 pm

2 stops13h 30m

Sofia

Tue 3/24

7:55 am-3:05 pm

1 stop13h 10m

$379

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/4

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Tue 5/5

6:55 pm-1:50 pm

1 stop25h 55m

$383

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/8

5:30 am-11:10 pm

2 stops34h 40m

Sofia

Thu 4/30

11:30 am-9:54 am

2 stops29h 24m

$386

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 $465, 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 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 $663 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 $603 on momondo.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 13% 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 January 2026, prices for Boston to Sofia flights are approximately 15% 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	13h 00m
Direct flights	None

The fastest flight from Boston to Sofia takes 13h 00m

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 13h 00m.
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 January 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 48% of the total bookings. Other popular airlines include United Airlines with 12%, KLM with 9%, and Turkish Airlines 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 1,443 reviews	Search KLM flights
SWISS	PriceFrom $388	Free Cancellation	Rating 7.5 1,859 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 894 reviews	Search Austrian Airlines flights
Air France	PriceFrom $397	Free Cancellation	Rating 7.4 1,523 reviews	Search Air France flights
United Airlines	PriceFrom $422	Free Cancellation	Rating 7.4 9,193 reviews	Search United Airlines flights
Lufthansa	PriceFrom $437	Free Cancellation	Rating 6.8 7,745 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 7,695 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,130 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $535	Free Cancellation	Rating 7.3 4,207 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 $144

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 4/19. 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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Filter for what you want

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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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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 to Sofia?

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 13% 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 January 2026, prices for Boston to Sofia flights are approximately 15% 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?

Lufthansa, Iberia, 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: 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 Amsterdam (AMS) offer the lowest average round-trip price of $569.

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 54m.

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

Vienna (VIE) has the shortest average layover time for this route: 1h 49m.

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