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

Frankfurt am Main (FRA) was the most common stop: 46% 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: 11h 06m.

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

Flights via Munich (MUC) offer the lowest average round-trip price of $681.

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

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

What airlines fly to Sofia?

Lufthansa, Turkish Airlines 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 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.

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.

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 October 2025, 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.

$279 Cheap Flights from Boston to Sofia in 2025/26

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Cheap round-trip flights

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2:16 pm - 11:40 amBOS-SOF

14h 24m2 stops

4:05 pm - 1:50 pmSOF-BOS

28h 45m1 stop

$342Austrian Airlines

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Tue, Apr 28 - Tue, May 12

8:40 pm - 6:20 pmBOS-SOF

14h 40m1 stop

2:00 pm - 6:35 pmSOF-BOS

11h 35m1 stop

$349Lufthansa

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Sun, Nov 16 - Fri, Dec 5

5:30 am - 6:20 pmBOS-SOF

29h 50m2 stops

2:00 pm - 9:27 pmSOF-BOS

14h 27m2 stops

$366Multiple Airlines

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Mon, Nov 17 - Wed, Dec 3

10:15 am - 6:20 pmBOS-SOF

25h 05m2 stops

12:35 pm - 2:05 pmSOF-BOS

32h 30m1 stop

$367Multiple Airlines

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Mon, Nov 24 - Mon, Dec 8

8:40 pm - 6:00 pmBOS-SOF

14h 20m2 stops

2:00 pm - 6:35 pmSOF-BOS

11h 35m1 stop

$368Lufthansa

Find Deal

Wed, Nov 19 - Wed, Dec 3

1:00 pm - 6:20 pmBOS-SOF

22h 20m2 stops

6:05 am - 12:12 pmSOF-BOS

37h 07m2 stops

$403United Airlines

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Wed, Nov 26 - Wed, Dec 3

9:30 am - 6:20 pmBOS-SOF

25h 50m3 stops

7:55 am - 6:32 pmSOF-BOS

17h 37m2 stops

$408United Airlines

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Tue, Jan 27 - Tue, Feb 10

9:50 pm - 6:20 pmBOS-SOF

13h 30m2 stops

2:00 pm - 8:20 pmSOF-BOS

37h 20m2 stops

$412SWISS

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Tue, Nov 18 - Tue, Dec 2

10:10 pm - 1:15 pmBOS-SOF

32h 05m2 stops

11:00 am - 9:00 pmSOF-BOS

16h 00m1 stop

$413SWISS

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Sun, Mar 1 - Sun, Mar 15

6:30 pm - 2:05 pmBOS-SOF

12h 35m1 stop

7:00 am - 1:40 pmSOF-BOS

13h 40m1 stop

$445Air France

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Mon, Dec 1 - Sat, Feb 28

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Nov 26

BOS1:00 pmBoston Logan Intl

22h 20m

2 stops

SOF6:20 pmSofia

Dec 3

SOF6:05 amSofia

37h 07m

2 stops

BOS12:12 pmBoston Logan Intl

$403

Find similar

United Airlines

Jan 27

BOS9:30 amBoston Logan Intl

25h 50m

3 stops

SOF6:20 pmSofia

Feb 10

SOF7:55 amSofia

17h 37m

2 stops

BOS6:32 pmBoston Logan Intl

$408

Find similar

United Airlines

Nov 19

BOS4:20 pmBoston Logan Intl

18h 40m

1 stop

SOF6:00 pmSofia

Dec 3

SOF2:00 pmSofia

11h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$416

Find similar

SWISS flights from Boston to Sofia

Our best SWISS deals on Boston to Sofia flight tickets

SWISS

Nov 18

BOS9:50 pmBoston Logan Intl

13h 30m

2 stops

SOF6:20 pmSofia

Dec 2

SOF2:00 pmSofia

37h 20m

2 stops

BOS8:20 pmBoston Logan Intl

$412

Find similar

SWISS

Mar 1

BOS10:10 pmBoston Logan Intl

32h 05m

2 stops

SOF1:15 pmSofia

Mar 15

SOF11:00 amSofia

16h 00m

1 stop

BOS9:00 pmBoston Logan Intl

$413

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/28

2:16 pm-11:40 am

2 stops14h 24m

Sofia

Tue 5/12

4:05 pm-1:50 pm

1 stop28h 45m

$342

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 11/16

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Fri 12/5

2:00 pm-6:35 pm

1 stop11h 35m

$349

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 11/17

5:30 am-6:20 pm

2 stops29h 50m

Sofia

Wed 12/3

2:00 pm-9:27 pm

2 stops14h 27m

$366

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 11/24

10:15 am-6:20 pm

2 stops25h 05m

Sofia

Mon 12/8

12:35 pm-2:05 pm

1 stop32h 30m

$367

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 11/19

8:40 pm-6:00 pm

2 stops14h 20m

Sofia

Wed 12/3

2:00 pm-6:35 pm

1 stop11h 35m

$368

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 11/26

1:00 pm-6:20 pm

2 stops22h 20m

Sofia

Wed 12/3

6:05 am-12:12 pm

2 stops37h 07m

$403

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/27

9:30 am-6:20 pm

3 stops25h 50m

Sofia

Tue 2/10

7:55 am-6:32 pm

2 stops17h 37m

$408

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 11/18

9:50 pm-6:20 pm

2 stops13h 30m

Sofia

Tue 12/2

2:00 pm-8:20 pm

2 stops37h 20m

$412

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 3/1

10:10 pm-1:15 pm

2 stops32h 05m

Sofia

Sun 3/15

11:00 am-9:00 pm

1 stop16h 00m

$413

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 12/1

6:30 pm-2:05 pm

1 stop12h 35m

Sofia

Sat 2/28

7:00 am-1:40 pm

1 stop13h 40m

$445

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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 October. Flight prices, which tend to average around $534, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from Boston during February instead. Flights to Sofia in February, while not as cheap as those in October, still average around $585.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Tuesday is the cheapest day to fly to Sofia from Boston. The lowest ticket price found for a Tuesday departure recently was $843. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Boston to Sofia on a Friday will generally be more expensive and average around $997. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the evening is the cheapest time of day to fly from Boston to Sofia when you can find flight prices for as low as $816. Flying to Sofia in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,022 per ticket.

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 $772 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 $665 on momondo.

How have Boston to Sofia flight prices changed over time?

As of October 2025, prices for Boston to Sofia flights are approximately 1% 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

Direct flights	None

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 25m.
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 October 2025, 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 50% of the total bookings. Other popular airlines include Turkish Airlines with 12%, United Airlines with 12%, and KLM 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 $410	Free Cancellation	Rating 7.7 1,406 reviews	Search KLM flights
Air France	PriceFrom $416	Free Cancellation	Rating 7.4 1,482 reviews	Search Air France flights
SWISS	PriceFrom $436	Free Cancellation	Rating 7.5 1,775 reviews	Search SWISS flights
Austrian Airlines	PriceFrom $447	Free Cancellation	Rating 7.6 862 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $472	Free Cancellation	Rating 7.4 8,999 reviews	Search United Airlines flights
Lufthansa	PriceFrom $479	Free Cancellation	Rating 6.8 7,542 reviews	Search Lufthansa flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,078 reviews	Search ITA Airways flights
British Airways	PriceFrom $510	Free Cancellation	Rating 6.7 7,488 reviews	Search British Airways flights
Turkish Airlines	PriceFrom $520	Free Cancellation	Rating 7.3 4,032 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 $279

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 12/10. 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

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

What is the cheapest month to fly to Sofia?

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight to Sofia?

How far in advance should I book a flight to Sofia?

How have Boston to Sofia flight prices changed over time?

As of October 2025, prices for Boston to Sofia flights are approximately 1% cheaper when compared to flights at the same time last year.

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

Lufthansa, United Airlines, and Air Canada 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: 46% 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 Munich (MUC) offer the lowest average round-trip price of $681.

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: 11h 06m.

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.

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

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