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

Austrian Airlines, SWISS, and United Airlines 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: 36% of momondo users choosing 1-stop flights on this route connected there.

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 60% 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 connection time from Boston to Sofia?

Vienna (VIE) has the shortest average layover time for this route: 1h 52m.

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 58m.

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

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $545.

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 March 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.

$327 Cheap Flights from Boston to Sofia in 2026

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9:50 pm - 1:15 pm

BOS

SOF

32h 25m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$514Turkish Airlines

Wed, Apr 22 - Wed, May 6

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$516Turkish Airlines

Tue, Apr 28 - Tue, May 19

9:50 pm - 3:00 pm

BOS

SOF

34h 10m

1 stop

9:05 pm - 7:55 pm

SOF

BOS

29h 50m

1 stop

$520Turkish Airlines

Wed, Apr 8 - Wed, Apr 29

9:50 pm - 3:00 pm

BOS

SOF

34h 10m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$523Turkish Airlines

Thu, Apr 9 - Wed, Apr 22

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$524Turkish Airlines

Wed, Sep 16 - Wed, Sep 30

9:50 pm - 3:00 pm

BOS

SOF

34h 10m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$528Turkish Airlines

Sat, Apr 25 - Thu, Apr 30

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$530Turkish Airlines

Mon, May 4 - Mon, May 11

9:50 pm - 3:00 pm

BOS

SOF

34h 10m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$533Turkish Airlines

Thu, Apr 9 - Wed, Apr 22

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

9:35 am - 7:55 pm

SOF

BOS

17h 20m

1 stop

$534Turkish Airlines

Tue, May 12 - Tue, May 26

8:05 pm - 11:00 pm

BOS

SOF

19h 55m

1 stop

7:25 pm - 5:40 pm

SOF

BOS

29h 15m

1 stop

$535Lufthansa

Mon, Apr 13 - Mon, Apr 27

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Apr 5

BOS8:05 pmBoston Logan Intl

19h 55m

1 stop

SOF11:00 pmSofia

Apr 21

SOF6:10 amSofia

18h 30m

1 stop

BOS5:40 pmBoston Logan Intl

$565

United Airlines

Apr 5

BOS5:45 amBoston Logan Intl

23h 25m

2 stops

SOF12:10 pmSofia

Apr 21

SOF6:10 amSofia

18h 30m

1 stop

BOS5:40 pmBoston Logan Intl

$570

United Airlines

Apr 8

BOS7:30 pmBoston Logan Intl

16h 10m

2 stops

SOF6:40 pmSofia

Apr 29

SOF8:00 amSofia

17h 19m

2 stops

BOS6:19 pmBoston Logan Intl

$577

Air France flights from Boston to Sofia

Our best Air France deals on Boston to Sofia flight tickets

Air France

Jul 14

BOS5:10 pmBoston Logan Intl

13h 50m

1 stop

SOF2:00 pmSofia

Aug 25

SOF7:00 amSofia

13h 39m

1 stop

BOS1:39 pmBoston Logan Intl

$596

Air France

Jul 7

BOS9:45 pmBoston Logan Intl

33h 15m

1 stop

SOF2:00 pmSofia

Aug 25

SOF7:00 amSofia

13h 39m

1 stop

BOS1:39 pmBoston Logan Intl

$598

Air France

Jul 7

BOS1:35 pmBoston Logan Intl

17h 25m

2 stops

SOF2:00 pmSofia

Aug 25

SOF7:00 amSofia

13h 39m

1 stop

BOS1:39 pmBoston Logan Intl

$601

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/22

9:50 pm-1:15 pm

1 stop32h 25m

Sofia

Wed 5/6

9:35 am-7:55 pm

1 stop17h 20m

$514

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/28

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Tue 5/19

9:35 am-7:55 pm

1 stop17h 20m

$516

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/8

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Wed 4/29

9:05 pm-7:55 pm

1 stop29h 50m

$520

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 4/9

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Wed 4/22

9:35 am-7:55 pm

1 stop17h 20m

$523

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 9/16

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Wed 9/30

3:50 pm-7:55 pm

1 stop35h 05m

$524

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 4/25

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Thu 4/30

9:35 am-7:55 pm

1 stop17h 20m

$528

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 5/4

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Mon 5/11

3:50 pm-7:55 pm

1 stop35h 05m

$530

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 4/9

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Wed 4/22

9:35 am-7:55 pm

1 stop17h 20m

$533

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 5/12

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Tue 5/26

9:35 am-7:55 pm

1 stop17h 20m

$534

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/13

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

Mon 4/27

7:25 pm-5:40 pm

1 stop29h 15m

$535

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 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 $460, 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 $614 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 $533 on momondo.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 48% 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 March 2026, prices for Boston to Sofia flights are approximately 38% 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

Fastest flight time	10h 00m
Direct flights	None

The fastest flight from Boston to Sofia takes 10h 00m

There are no direct flights from Boston to Sofia. There are no popular flight routes from Boston to Sofia.

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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 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 March 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 45% of the total bookings. Other popular airlines include KLM with 12%, United Airlines with 12%, and Turkish Airlines 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
KLM	PriceFrom $380	Free Cancellation	Rating 7.8 1,477 reviews	Search KLM flights
SWISS	PriceFrom $388	Free Cancellation	Rating 7.5 1,903 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 902 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,550 reviews	Search Air France flights
United Airlines	PriceFrom $415	Free Cancellation	Rating 7.4 9,465 reviews	Search United Airlines flights
Lufthansa	PriceFrom $418	Free Cancellation	Rating 6.8 7,863 reviews	Search Lufthansa flights
British Airways	PriceFrom $478	Free Cancellation	Rating 6.7 7,812 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,173 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.3 4,274 reviews	Search Turkish Airlines flights

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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 $327

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 8/16. 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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How to get the cheapest flight ticket from Boston to 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?

How have Boston to Sofia flight prices changed over time?

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

What airlines fly to Sofia?

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

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

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

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

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

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?

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

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List of cabin classes available on flights landing in Sofia. Availability may vary depending on flight origin and airline.

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