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

Vienna (VIE) has the shortest average layover time for this route: 1h 48m.

What airlines fly to Sofia?

Lufthansa, KLM 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 54% 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 airport is the most popular layover for flights between Boston and Sofia?

Frankfurt am Main (FRA) was the most common stop: 32% 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 47m.

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

SWISS and Lufthansa are the most popular carriers operating from Boston Logan Intl to Sofia

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

Flights via Zurich (ZRH) offer the lowest average round-trip price of $539.

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 April 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.

$323 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 $1,068 to $696. The lowest price recently found on this route was $586.

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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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11:00 pm - 1:15 am

BOS

SOF

19h 15m

2 stops

10:10 am - 9:15 pm

SOF

BOS

18h 05m

1 stop

$586Multiple Airlines

Thu, Sep 24 - Thu, Oct 8

11:00 pm - 12:15 pm

BOS

SOF

30h 15m

1 stop

9:40 pm - 9:15 pm

SOF

BOS

30h 35m

1 stop

$588Multiple Airlines

Wed, Sep 23 - Wed, Oct 7

12:30 pm - 12:10 pm

BOS

SOF

16h 40m

2 stops

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$589Multiple Airlines

Tue, Oct 20 - Tue, Nov 3

11:50 pm - 1:35 am

BOS

SOF

18h 45m

1 stop

6:30 am - 10:05 pm

SOF

BOS

22h 35m

2 stops

$590Multiple Airlines

Sun, Sep 20 - Sun, Oct 4

5:20 pm - 10:20 am

BOS

SOF

10h 00m

1 stop

6:10 am - 2:37 pm

SOF

BOS

15h 27m

2 stops

$595Multiple Airlines

Wed, Oct 21 - Wed, Nov 4

11:00 pm - 12:15 pm

BOS

SOF

30h 15m

1 stop

5:45 am - 9:15 pm

SOF

BOS

22h 30m

2 stops

$600Multiple Airlines

Wed, Sep 23 - Wed, Oct 7

11:00 pm - 12:15 pm

BOS

SOF

30h 15m

1 stop

5:45 am - 9:15 pm

SOF

BOS

22h 30m

2 stops

$603Multiple Airlines

Wed, Sep 23 - Wed, Oct 7

5:10 pm - 11:40 am

BOS

SOF

11h 30m

1 stop

6:55 pm - 1:50 pm

SOF

BOS

25h 55m

1 stop

$604Austrian Airlines

Tue, Aug 25 - Tue, Sep 8

11:00 pm - 12:15 pm

BOS

SOF

30h 15m

1 stop

9:40 pm - 9:15 pm

SOF

BOS

30h 35m

1 stop

$607Multiple Airlines

Wed, Sep 9 - Wed, Sep 23

11:50 pm - 1:35 am

BOS

SOF

18h 45m

1 stop

6:00 am - 9:15 pm

SOF

BOS

22h 15m

2 stops

$608Multiple Airlines

Sun, Sep 20 - Wed, Oct 7

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Air Canada flights from Boston to Sofia

Our best Air Canada deals on Boston to Sofia flight tickets

Air Canada

Aug 25

BOS5:45 amBoston Logan Intl

29h 55m

2 stops

SOF6:40 pmSofia

Sep 8

SOF11:35 amSofia

29h 15m

2 stops

BOS9:50 amBoston Logan Intl

$662

Air Canada

Oct 25

BOS5:40 pmBoston Logan Intl

18h 40m

2 stops

SOF6:20 pmSofia

Nov 8

SOF2:00 pmSofia

31h 37m

2 stops

BOS2:37 pmBoston Logan Intl

$673

Air Canada

May 2

BOS6:50 pmBoston Logan Intl

33h 10m

2 stops

SOF11:00 amSofia

May 12

SOF6:10 amSofia

22h 17m

2 stops

BOS9:27 pmBoston Logan Intl

$714

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

Lufthansa

Oct 21

BOS8:05 pmBoston Logan Intl

15h 35m

1 stop

SOF6:40 pmSofia

Nov 4

SOF6:00 amSofia

19h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$615

Lufthansa

May 9

BOS5:45 pmBoston Logan Intl

10h 15m

1 stop

SOF11:00 amSofia

May 15

SOF7:05 pmSofia

27h 35m

1 stop

BOS3:40 pmBoston Logan Intl

$828

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 9/24

11:00 pm-1:15 am

2 stops19h 15m

Sofia

Thu 10/8

10:10 am-9:15 pm

1 stop18h 05m

$586

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 9/23

11:00 pm-12:15 pm

1 stop30h 15m

Sofia

Wed 10/7

9:40 pm-9:15 pm

1 stop30h 35m

$588

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 10/20

12:30 pm-12:10 pm

2 stops16h 40m

Sofia

Tue 11/3

7:55 am-1:30 pm

1 stop12h 35m

$589

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 9/20

11:50 pm-1:35 am

1 stop18h 45m

Sofia

Sun 10/4

6:30 am-10:05 pm

2 stops22h 35m

$590

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/21

5:20 pm-10:20 am

1 stop10h 00m

Sofia

Wed 11/4

6:10 am-2:37 pm

2 stops15h 27m

$595

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 9/23

11:00 pm-12:15 pm

1 stop30h 15m

Sofia

Wed 10/7

5:45 am-9:15 pm

2 stops22h 30m

$600

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 9/23

11:00 pm-12:15 pm

1 stop30h 15m

Sofia

Wed 10/7

5:45 am-9:15 pm

2 stops22h 30m

$603

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 8/25

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Tue 9/8

6:55 pm-1:50 pm

1 stop25h 55m

$604

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 9/9

11:00 pm-12:15 pm

1 stop30h 15m

Sofia

Wed 9/23

9:40 pm-9:15 pm

1 stop30h 35m

$607

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 9/20

11:50 pm-1:35 am

1 stop18h 45m

Sofia

Wed 10/7

6:00 am-9:15 pm

2 stops22h 15m

$608

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 $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 from Boston 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 $629 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 $493 on momondo.

Can stopping save me money on Boston to Sofia flights?

You could potentially save up to 49% 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 April 2026, prices for Boston to Sofia flights are approximately 16% 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	9h 55m
Direct flights	None

The fastest flight from Boston to Sofia takes 9h 55m

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

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Frequently asked questions about flying from Boston to Sofia

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 9h 55m.
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 April 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 41% of the total bookings. Other popular airlines include KLM with 14%, United Airlines with 13%, 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 7.8 1,508 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 911 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,580 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.5 1,924 reviews	Search SWISS flights
United Airlines	PriceFrom $415	Free Cancellation	Rating 7.4 9,671 reviews	Search United Airlines flights
Lufthansa	PriceFrom $416	Free Cancellation	Rating 6.8 7,956 reviews	Search Lufthansa flights
British Airways	PriceFrom $478	Free Cancellation	Rating 6.7 7,923 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,198 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,339 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.

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Cheap flights from Boston to Sofia from $323

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 5/18. 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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Air Canada flights from Boston to Sofia

Our best Air Canada deals on Boston to Sofia flight tickets

Lufthansa flights from Boston to Sofia

Our best Lufthansa deals on Boston to Sofia flight tickets

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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 from Boston 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

Frequently asked questions about flying 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?

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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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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