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 travel time from Boston to Sofia?

Flights connecting via Vienna (VIE) have the shortest average one-way travel time: 10h 58m.

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

Frankfurt am Main (FRA) was the most common stop: 37% 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 $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.

$241 Cheap Flights from Boston to Sofia in 2026

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8:05 pm - 11:00 pm

BOS

SOF

19h 55m

1 stop

7:25 pm - 5:40 pm

SOF

BOS

29h 15m

1 stop

$501Lufthansa

Mon, Apr 13 - Mon, Apr 27

8:05 pm - 6:00 pm

BOS

SOF

14h 55m

2 stops

12:55 pm - 5:40 pm

SOF

BOS

11h 45m

1 stop

$507Lufthansa

Tue, Apr 14 - Tue, Apr 28

9:40 pm - 10:20 am

BOS

SOF

29h 40m

1 stop

7:25 pm - 5:40 pm

SOF

BOS

29h 15m

1 stop

$510Multiple Airlines

Mon, Apr 13 - Mon, Apr 27

9:40 pm - 10:20 am

BOS

SOF

29h 40m

1 stop

3:40 pm - 3:10 pm

SOF

BOS

30h 30m

1 stop

$511SWISS

Mon, Apr 6 - Mon, Apr 20

9:50 pm - 1:15 pm

BOS

SOF

32h 25m

1 stop

9:05 pm - 7:55 pm

SOF

BOS

29h 50m

1 stop

$512Turkish Airlines

Wed, May 6 - Wed, May 20

8:05 pm - 6:05 pm

BOS

SOF

15h 00m

2 stops

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$513Multiple Airlines

Wed, Apr 1 - Wed, Apr 15

5:10 pm - 3:20 pm

BOS

SOF

15h 10m

1 stop

6:55 pm - 1:50 pm

SOF

BOS

25h 55m

1 stop

$514Austrian Airlines

Tue, Apr 28 - Tue, May 5

9:50 pm - 8:15 pm

BOS

SOF

15h 25m

1 stop

3:50 pm - 7:55 pm

SOF

BOS

35h 05m

1 stop

$515Turkish Airlines

Tue, May 5 - Tue, May 19

5:45 pm - 1:25 pm

BOS

SOF

12h 40m

1 stop

8:00 am - 1:50 pm

SOF

BOS

12h 50m

1 stop

$517Multiple Airlines

Wed, Apr 1 - Wed, Apr 15

6:15 am - 6:40 pm

BOS

SOF

29h 25m

2 stops

6:10 am - 5:40 pm

SOF

BOS

18h 30m

1 stop

$518Multiple Airlines

Mon, Apr 6 - Fri, Apr 17

SWISS flights from Boston to Sofia

Our best SWISS deals on Boston to Sofia flight tickets

SWISS

Apr 6

BOS9:40 pmBoston Logan Intl

29h 40m

1 stop

SOF10:20 amSofia

Apr 20

SOF3:40 pmSofia

30h 30m

1 stop

BOS3:10 pmBoston Logan Intl

$511

SWISS

Apr 6

BOS5:20 pmBoston Logan Intl

18h 20m

2 stops

SOF6:40 pmSofia

Apr 20

SOF3:40 pmSofia

30h 30m

1 stop

BOS3:10 pmBoston Logan Intl

$549

KLM flights from Boston to Sofia

Our best KLM deals on Boston to Sofia flight tickets

KLM

Mar 18

BOS1:55 pmBoston Logan Intl

18h 10m

2 stops

SOF2:05 pmSofia

Apr 2

SOF7:00 amSofia

13h 13m

1 stop

BOS1:13 pmBoston Logan Intl

$553

KLM

May 13

BOS4:35 pmBoston Logan Intl

14h 25m

1 stop

SOF2:00 pmSofia

Aug 28

SOF7:00 amSofia

16h 37m

1 stop

BOS4:37 pmBoston Logan Intl

$578

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

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

$501

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/14

8:05 pm-6:00 pm

2 stops14h 55m

Sofia

Tue 4/28

12:55 pm-5:40 pm

1 stop11h 45m

$507

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/13

9:40 pm-10:20 am

1 stop29h 40m

Sofia

Mon 4/27

7:25 pm-5:40 pm

1 stop29h 15m

$510

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/6

9:40 pm-10:20 am

1 stop29h 40m

Sofia

Mon 4/20

3:40 pm-3:10 pm

1 stop30h 30m

$511

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 5/6

9:50 pm-1:15 pm

1 stop32h 25m

Sofia

Wed 5/20

9:05 pm-7:55 pm

1 stop29h 50m

$512

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/1

8:05 pm-6:05 pm

2 stops15h 00m

Sofia

Wed 4/15

8:00 am-1:50 pm

1 stop12h 50m

$513

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/28

5:10 pm-3:20 pm

1 stop15h 10m

Sofia

Tue 5/5

6:55 pm-1:50 pm

1 stop25h 55m

$514

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 5/5

9:50 pm-8:15 pm

1 stop15h 25m

Sofia

Tue 5/19

3:50 pm-7:55 pm

1 stop35h 05m

$515

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/1

5:45 pm-1:25 pm

1 stop12h 40m

Sofia

Wed 4/15

8:00 am-1:50 pm

1 stop12h 50m

$517

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 4/6

6:15 am-6:40 pm

2 stops29h 25m

Sofia

Fri 4/17

6:10 am-5:40 pm

1 stop18h 30m

$518

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 20% 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	12h 10m
Direct flights	None

The fastest flight from Boston to Sofia takes 12h 10m

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 12h 10m.
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 46% of the total bookings. Other popular airlines include United Airlines with 12%, KLM with 12%, and SWISS 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 1,471 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 900 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,546 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 1,897 reviews	Search SWISS flights
United Airlines	PriceFrom $415	Free Cancellation	Rating 7.4 9,429 reviews	Search United Airlines flights
Lufthansa	PriceFrom $421	Free Cancellation	Rating 6.8 7,854 reviews	Search Lufthansa flights
British Airways	PriceFrom $478	Free Cancellation	Rating 6.7 7,794 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,170 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.3 4,256 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 $241

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 4/26. 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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SWISS flights from Boston to Sofia

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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 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.

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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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