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

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

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 38m.

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 layover airport offers the lowest fares from Boston to Sofia?

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

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

Vienna (VIE) has the shortest average layover time for this route: 1h 45m.

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.

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 May 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.

$369 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 $1,072 to $699. The lowest price recently found on this route was $608.

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Find the cheapest flights from Boston to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:10 pm - 11:40 am

BOS

SOF

11h 30m

1 stop

4:05 pm - 1:50 pm

SOF

BOS

28h 45m

1 stop

$608Austrian Airlines

Tue, Sep 1 - Tue, Sep 15

5:10 pm - 11:40 am

BOS

SOF

11h 30m

1 stop

6:55 pm - 1:50 pm

SOF

BOS

25h 55m

1 stop

$609Austrian Airlines

Tue, Sep 1 - Tue, Sep 15

10:50 pm - 3:15 pm

BOS

SOF

10h 25m

1 stop

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$611Multiple Airlines

Wed, Oct 28 - Tue, Nov 10

9:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$612Multiple Airlines

Tue, Oct 27 - Tue, Nov 10

10:50 pm - 3:15 pm

BOS

SOF

10h 25m

1 stop

6:00 am - 6:35 pm

SOF

BOS

19h 35m

1 stop

$613Multiple Airlines

Wed, Oct 28 - Thu, Nov 12

9:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$614United Airlines

Sun, Oct 25 - Tue, Nov 10

9:40 pm - 10:45 pm

BOS

SOF

19h 05m

1 stop

6:00 am - 6:35 pm

SOF

BOS

19h 35m

1 stop

$615Lufthansa

Wed, Oct 28 - Wed, Nov 11

9:40 pm - 6:20 pm

BOS

SOF

14h 40m

1 stop

6:00 am - 6:35 pm

SOF

BOS

19h 35m

1 stop

$617Lufthansa

Tue, Oct 27 - Thu, Nov 12

7:55 pm - 11:50 am

BOS

SOF

9h 55m

1 stop

6:45 pm - 1:30 pm

SOF

BOS

25h 45m

1 stop

$618Austrian Airlines

Sun, Oct 25 - Mon, Nov 9

10:30 am - 1:10 pm

BOS

SOF

20h 40m

2 stops

7:55 am - 1:30 pm

SOF

BOS

12h 35m

1 stop

$619United Airlines

Sun, Oct 25 - Tue, Nov 10

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Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

Austrian Airlines

Sep 1

BOS5:10 pmBoston Logan Intl

11h 30m

1 stop

SOF11:40 amSofia

Sep 15

SOF4:05 pmSofia

28h 45m

1 stop

BOS1:50 pmBoston Logan Intl

$608

Austrian Airlines

Sep 1

BOS5:10 pmBoston Logan Intl

11h 30m

1 stop

SOF11:40 amSofia

Sep 15

SOF6:55 pmSofia

25h 55m

1 stop

BOS1:50 pmBoston Logan Intl

$609

Austrian Airlines

May 6

BOS2:22 pmBoston Logan Intl

20h 48m

2 stops

SOF6:10 pmSofia

May 13

SOF8:00 amSofia

17h 11m

2 stops

BOS6:11 pmBoston Logan Intl

$617

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets

United Airlines

Oct 25

BOS9:40 pmBoston Logan Intl

19h 05m

1 stop

SOF10:45 pmSofia

Nov 13

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$614

United Airlines

Oct 25

BOS10:30 amBoston Logan Intl

20h 40m

2 stops

SOF1:10 pmSofia

Nov 10

SOF7:55 amSofia

12h 35m

1 stop

BOS1:30 pmBoston Logan Intl

$619

United Airlines

Oct 25

BOS12:30 pmBoston Logan Intl

18h 40m

2 stops

SOF1:10 pmSofia

Nov 12

SOF6:00 amSofia

19h 35m

1 stop

BOS6:35 pmBoston Logan Intl

$621

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Tue 9/15

4:05 pm-1:50 pm

1 stop28h 45m

$608

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 9/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Tue 9/15

6:55 pm-1:50 pm

1 stop25h 55m

$609

Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/28

10:50 pm-3:15 pm

1 stop10h 25m

Sofia

Tue 11/10

7:55 am-1:30 pm

1 stop12h 35m

$611

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 10/27

9:40 pm-10:45 pm

1 stop19h 05m

Sofia

Tue 11/10

7:55 am-1:30 pm

1 stop12h 35m

$612

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/28

10:50 pm-3:15 pm

1 stop10h 25m

Sofia

Thu 11/12

6:00 am-6:35 pm

1 stop19h 35m

$613

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/25

9:40 pm-6:20 pm

1 stop14h 40m

Sofia

Tue 11/10

7:55 am-1:30 pm

1 stop12h 35m

$614

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/28

9:40 pm-10:45 pm

1 stop19h 05m

Sofia

Wed 11/11

6:00 am-6:35 pm

1 stop19h 35m

$615

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 10/27

9:40 pm-6:20 pm

1 stop14h 40m

Sofia

Thu 11/12

6:00 am-6:35 pm

1 stop19h 35m

$617

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/25

7:55 pm-11:50 am

1 stop9h 55m

Sofia

Mon 11/9

6:45 pm-1:30 pm

1 stop25h 45m

$618

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/25

10:30 am-1:10 pm

2 stops20h 40m

Sofia

Tue 11/10

7:55 am-1:30 pm

1 stop12h 35m

$619

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 $630 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 May 2026, prices for Boston to Sofia flights are approximately 3% 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 25m
Direct flights	None

The fastest flight from Boston to Sofia takes 10h 25m

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

Search flight deals

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 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 May 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 12%, 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 1,511 reviews	Search KLM flights
Austrian Airlines	PriceFrom $394	Free Cancellation	Rating 7.6 914 reviews	Search Austrian Airlines flights
Air France	PriceFrom $396	Free Cancellation	Rating 7.4 1,583 reviews	Search Air France flights
SWISS	PriceFrom $410	Free Cancellation	Rating 7.6 1,936 reviews	Search SWISS flights
United Airlines	PriceFrom $415	Free Cancellation	Rating 7.4 9,682 reviews	Search United Airlines flights
Lufthansa	PriceFrom $416	Free Cancellation	Rating 6.8 7,972 reviews	Search Lufthansa flights
British Airways	PriceFrom $478	Free Cancellation	Rating 6.7 7,944 reviews	Search British Airways flights
ITA Airways	PriceFrom $505	Free Cancellation	Rating 6.7 1,201 reviews	Search ITA Airways flights
Turkish Airlines	PriceFrom $524	Free Cancellation	Rating 7.4 4,345 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 $293

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 9/1. 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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Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets

United Airlines flights from Boston to Sofia

Our best United Airlines 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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