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

Frankfurt am Main (FRA) was the most common stop: 41% 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.

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.

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 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.

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

SWISS is the most popular carrier operating from Boston Logan Intl to Sofia

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 February 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.

$247 Cheap Flights from Boston to Sofia in 2026

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One-way

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Cheap round-trip flights

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8:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

6:45 pm - 3:05 pm

SOF

BOS

26h 20m

1 stop

$353Multiple Airlines

Mon, Mar 2 - Mon, Mar 16

5:10 pm - 3:20 pm

BOS

SOF

15h 10m

1 stop

12:25 pm - 1:50 pm

SOF

BOS

32h 25m

1 stop

$356Austrian Airlines

Tue, Mar 31 - Tue, Apr 14

8:05 pm - 11:00 pm

BOS

SOF

19h 55m

1 stop

3:40 pm - 3:10 pm

SOF

BOS

30h 30m

1 stop

$362Multiple Airlines

Sun, Apr 5 - Mon, Apr 20

8:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

6:10 am - 2:10 pm

SOF

BOS

14h 00m

1 stop

$363Lufthansa

Wed, Mar 4 - Wed, Mar 18

8:05 pm - 11:00 pm

BOS

SOF

19h 55m

1 stop

7:25 pm - 5:40 pm

SOF

BOS

29h 15m

1 stop

$366Lufthansa

Sun, Apr 5 - Mon, Apr 20

9:40 pm - 12:15 pm

BOS

SOF

31h 35m

1 stop

3:45 pm - 3:10 pm

SOF

BOS

30h 25m

1 stop

$370SWISS

Sun, Apr 5 - Mon, Apr 20

8:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

2:00 pm - 9:32 am

SOF

BOS

25h 32m

2 stops

$371Multiple Airlines

Wed, Mar 4 - Wed, Mar 18

5:30 am - 11:50 am

BOS

SOF

23h 20m

2 stops

6:05 am - 9:32 am

SOF

BOS

33h 27m

2 stops

$375Multiple Airlines

Wed, Mar 4 - Wed, Mar 18

5:20 pm - 10:20 am

BOS

SOF

10h 00m

1 stop

11:05 am - 7:55 pm

SOF

BOS

15h 50m

1 stop

$379SWISS

Wed, Apr 1 - Wed, Apr 15

10:40 am - 10:20 am

BOS

SOF

16h 40m

2 stops

6:10 am - 5:57 pm

SOF

BOS

18h 47m

2 stops

$380Multiple Airlines

Tue, Apr 14 - Tue, Apr 28

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Apr 21

BOS8:05 pmBoston Logan Intl

20h 05m

1 stop

SOF11:10 pmSofia

May 6

SOF8:00 amSofia

12h 50m

1 stop

BOS1:50 pmBoston Logan Intl

$395

United Airlines

Apr 28

BOS8:05 pmBoston Logan Intl

19h 55m

1 stop

SOF11:00 pmSofia

May 12

SOF12:55 pmSofia

11h 45m

1 stop

BOS5:40 pmBoston Logan Intl

$398

United Airlines

Apr 22

BOS9:30 amBoston Logan Intl

19h 40m

2 stops

SOF12:10 pmSofia

May 5

SOF12:55 pmSofia

11h 45m

1 stop

BOS5:40 pmBoston Logan Intl

$402

SWISS flights from Boston to Sofia

Our best SWISS deals on Boston to Sofia flight tickets

SWISS

Apr 5

BOS9:40 pmBoston Logan Intl

31h 35m

1 stop

SOF12:15 pmSofia

Apr 20

SOF3:45 pmSofia

30h 25m

1 stop

BOS3:10 pmBoston Logan Intl

$370

SWISS

Apr 1

BOS5:20 pmBoston Logan Intl

10h 00m

1 stop

SOF10:20 amSofia

Apr 15

SOF11:05 amSofia

15h 50m

1 stop

BOS7:55 pmBoston Logan Intl

$379

SWISS

Apr 5

BOS9:40 pmBoston Logan Intl

31h 30m

2 stops

SOF12:10 pmSofia

Apr 20

SOF3:45 pmSofia

30h 25m

1 stop

BOS3:10 pmBoston Logan Intl

$385

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 3/2

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Mon 3/16

6:45 pm-3:05 pm

1 stop26h 20m

$353

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 3/31

5:10 pm-3:20 pm

1 stop15h 10m

Sofia

Tue 4/14

12:25 pm-1:50 pm

1 stop32h 25m

$356

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 4/5

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

Mon 4/20

3:40 pm-3:10 pm

1 stop30h 30m

$362

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/4

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Wed 3/18

6:10 am-2:10 pm

1 stop14h 00m

$363

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 4/5

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

Mon 4/20

7:25 pm-5:40 pm

1 stop29h 15m

$366

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 4/5

9:40 pm-12:15 pm

1 stop31h 35m

Sofia

Mon 4/20

3:45 pm-3:10 pm

1 stop30h 25m

$370

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/4

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Wed 3/18

2:00 pm-9:32 am

2 stops25h 32m

$371

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 3/4

5:30 am-11:50 am

2 stops23h 20m

Sofia

Wed 3/18

6:05 am-9:32 am

2 stops33h 27m

$375

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 4/1

5:20 pm-10:20 am

1 stop10h 00m

Sofia

Wed 4/15

11:05 am-7:55 pm

1 stop15h 50m

$379

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/14

10:40 am-10:20 am

2 stops16h 40m

Sofia

Tue 4/28

6:10 am-5:57 pm

2 stops18h 47m

$380

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 $461, 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 $634 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 $612 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 February 2026, prices for Boston to Sofia flights are approximately 50% 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	13h 50m
Direct flights	None

The fastest flight from Boston to Sofia takes 13h 50m

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 50m.
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 February 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 47% of the total bookings. Other popular airlines include United Airlines with 12%, KLM with 10%, 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 1,451 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.5 896 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,531 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.6 1,870 reviews	Search SWISS flights
United Airlines	PriceFrom $417	Free Cancellation	Rating 7.4 9,281 reviews	Search United Airlines flights
Lufthansa	PriceFrom $435	Free Cancellation	Rating 6.8 7,780 reviews	Search Lufthansa flights
British Airways	PriceFrom $482	Free Cancellation	Rating 6.7 7,733 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,148 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.3 4,208 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 $247

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 3/1. 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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United Airlines 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 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?

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

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Cabin classes currently available on flights to Sofia

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

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