Sofia

$214+ Cheap flights from Boston (BOS) to Sofia (SOF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Mar 23 — Mar 301
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Cheap flight deals from Boston to Sofia

Cheapest flights from Boston to Sofia
Explore the most affordable flight options available from Boston to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 21, 2026.

This AirNGo deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:30 am
BOS
-
SOF
2 stops25h 45m
Multiple Airlines
Wed 11/256:00 am
SOF
-
BOS
1 stop19h 35m
Multiple Airlines
Deal found 2/18$367
This AirNGo deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:40 pm
BOS
-
SOF
2 stops12h 35m
Air Canada
Wed 11/256:00 am
SOF
-
BOS
2 stops19h 42m
Air Canada
Deal found 2/18$376
This Kiwi.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:25 pm
BOS
-
SOF
1 stop14h 00m
Lufthansa
Wed 11/256:00 am
SOF
-
BOS
1 stop19h 35m
Lufthansa
Deal found 2/18$377
This Mytrip deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:15 am
BOS
-
SOF
2 stops22h 55m
Multiple Airlines
Tue 4/2812:55 pm
SOF
-
BOS
1 stop11h 45m
Multiple Airlines
Deal found 2/19$386
This Booking.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/135:20 pm
BOS
-
SOF
1 stop11h 55m
SWISS
Wed 4/2911:05 am
SOF
-
BOS
1 stop15h 50m
SWISS
Deal found 2/18$388
This SWISS deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:40 pm
BOS
-
SOF
1 stop31h 35m
SWISS
Tue 4/141:05 pm
SOF
-
BOS
1 stop33h 05m
SWISS
Deal found 2/18$390
This FlightHub deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/78:05 pm
BOS
-
SOF
1 stop19h 55m
Multiple Airlines
Tue 4/211:05 pm
SOF
-
BOS
1 stop33h 05m
Multiple Airlines
Deal found 2/18$391
This Gotogate deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:15 am
BOS
-
SOF
2 stops22h 55m
Multiple Airlines
Wed 4/298:00 am
SOF
-
BOS
1 stop12h 50m
Multiple Airlines
Deal found 2/18$395
This Air France deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/227:30 pm
BOS
-
SOF
1 stop12h 25m
Air France
Tue 4/77:00 am
SOF
-
BOS
1 stop13h 33m
Air France
Deal found 2/21$398
This Kiwi.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:40 pm
BOS
-
SOF
1 stop19h 05m
Multiple Airlines
Sun 4/56:55 pm
SOF
-
BOS
1 stop25h 55m
Multiple Airlines
Deal found 2/18$400
This Mytrip deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/293:35 pm
BOS
-
SOF
2 stops19h 35m
Multiple Airlines
Tue 4/1412:25 pm
SOF
-
BOS
1 stop32h 25m
Multiple Airlines
Deal found 2/18$401
This Mytrip deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/131:00 pm
BOS
-
SOF
2 stops16h 10m
Multiple Airlines
Mon 4/277:25 pm
SOF
-
BOS
1 stop29h 15m
Multiple Airlines
Deal found 2/18$402

Find flight deals from Boston to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Sofia (SOF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$367
(AirNGo)

One-way from

$214
(Lufthansa)

Popular in

June

Cheapest in

February

Average price

$461
Provider with most accurate pricing for Boston Logan Intl-Sofia flight deals.
Provider most trusted by Cheapflights users for Boston Logan Intl-Sofia flights.
From Boston Logan Intl to Sofia
One-way flight from Boston Logan Intl to Sofia
Highest demand for flights based on searches. 20% potential increase in price ($165 potential increase over avg. RT price).
Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
Average for round-trip flights in February 2026

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 21, 2026.
Use the filters below to find and compare flights from Boston to Sofia that are best for you.

Fly from

Boston

Fly to

Sofia

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/14

9:40 pm-10:20 am

1 stop29h 40m

Sofia

Tue 4/28

1:05 pm-3:10 pm

1 stop33h 05m

$390

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/7

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

Tue 4/21

8:00 am-6:19 pm

2 stops17h 19m

$405

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/7

7:00 pm-2:00 pm

1 stop12h 00m

Sofia

Tue 8/25

7:00 am-7:35 pm

1 stop19h 35m

$435

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 8/11

1:10 pm-2:00 pm

2 stops17h 50m

Sofia

Tue 8/18

7:00 am-7:35 pm

1 stop19h 35m

$440

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 4/4

6:40 pm-6:10 pm

2 stops40h 30m

Sofia

Mon 4/13

8:00 am-1:50 pm

1 stop12h 50m

$471

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 4/3

10:40 am-10:30 pm

2 stops28h 50m

Sofia

Tue 4/7

8:00 am-11:59 pm

2 stops22h 59m

$481

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 4/11

6:40 pm-6:10 pm

2 stops40h 30m

Sofia

Sat 4/25

12:55 pm-9:56 am

2 stops52h 01m

$492

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 8/16

4:45 pm-2:00 pm

1 stop14h 15m

Sofia

Sun 9/6

7:00 am-1:19 pm

1 stop13h 19m

$495

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 8/5

8:05 pm-11:00 pm

1 stop19h 55m

$214

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 8/4

8:05 pm-11:00 pm

1 stop19h 55m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

Showing 1-10 of 17 results
1
2

Compare providers for flights from Boston to Sofia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Sofia in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Sofia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Sofia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Sofia flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Sofia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boston to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Boston with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Sofia

How far ahead should I book a flight from Boston to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Sofia. Price data was last updated on February 20, 2026.

The best time to book flights from Boston to Sofia is 60 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Boston to Sofia?

Currently, April is the cheapest month in which you can book a flight from Boston to Sofia (average of $380). Flying from Boston to Sofia in May is currently the most expensive (average of $593). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sofia. Reviews last updated February 21, 2026.
Peruse reviews from past customers who have flown with KLM, SWISS, and United Airlines from Boston to Sofia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Food

7.3

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Related info for your journey

Find useful and relevant information for your journey from Boston to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • How long is the flight from Boston to Sofia?

    SWISS and United Airlines can get you from Boston to Sofia in just under 19h 55m. Your travel time can differ by up to 9h 45m. The distance between Boston and Sofia is about 4521 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Boston to Sofia round-trip?

    KLM, at $380, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include Austrian Airlines and Air France. KLM is 39% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Boston to Sofia one-way?

    One-way options have recently been found by users for as low as $229 on Austrian Airlines. Other airlines that offer cheap prices include Lufthansa from $374 and KLM from $385 one-way.

  • Can I find deals for flights from Boston to Sofia that include hotel bookings?

    Yes. In addition to deals on Boston to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boston to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Sofia.

  • Can I find deals for business class flights from Boston to Sofia?

    Yes. Cheapflights offers flight deals from Boston to Sofia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boston to Sofia?

    Currently, April is the cheapest month in which you can book a flight from Boston to Sofia (average of $380). Flying from Boston to Sofia in May is currently the most expensive (average of $593). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Boston to Sofia

See prices for flight routes from nearby airports that may be better suited for you.

Top 9 airlines flying from Boston to Sofia

Discover the top 9 airlines that operate flights from Boston to Sofia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$380Average$487FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$394Average$681FlexibilityNo cancel feeOn-time78%
Air FranceCheapest$396Average$494FlexibilityNo cancel feeOn-time77%
SWISSCheapest$410Average$681FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$417Average$699FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$428Average$761FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$482Average$540FlexibilityNo cancel feeOn-time70%
ITA AirwaysCheapest$505Average$924FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$524Average$697FlexibilityNo cancel feeOn-time77%

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