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Bulgaria

$274+ Cheap flights from Boston (BOS) to Bulgaria

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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Mar 1 — Mar 81
Sun 3/1
Sun 3/8
1 adult, Economy
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Cheap flight deals from Boston to Bulgaria

Cheapest flights from Boston to Bulgaria
Explore the most affordable flight options available from Boston to Bulgaria. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/29. 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 3/28:40 pm
BOS
-
SOF
1 stop19h 05m
Multiple Airlines
Mon 3/166:45 pm
SOF
-
BOS
1 stop26h 20m
Multiple Airlines
Deal found 1/29$352
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Tue 2/178:40 pm
BOS
-
SOF
1 stop14h 40m
Multiple Airlines
Tue 3/37:55 am
SOF
-
BOS
1 stop13h 10m
Multiple Airlines
Deal found 1/29$353
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Wed 2/259:50 pm
BOS
-
SOF
1 stop10h 25m
Multiple Airlines
Wed 3/42:00 pm
SOF
-
BOS
1 stop11h 35m
Multiple Airlines
Deal found 1/28$363
This Mytrip deal was found by Cheapflights users on 1/29. 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 3/249:40 pm
BOS
-
SOF
1 stop19h 05m
Multiple Airlines
Tue 4/78:00 am
SOF
-
BOS
2 stops16h 57m
Multiple Airlines
Deal found 1/29$368
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 3/237:34 pm
BOS
-
SOF
2 stops16h 46m
Lufthansa
Mon 4/67:00 pm
SOF
-
BOS
1 stop27h 40m
Lufthansa
Deal found 1/28$369
This Kiwi.com deal was found by Cheapflights users on 1/29. 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.
Tue 2/178:40 pm
BOS
-
SOF
2 stops14h 35m
Multiple Airlines
Fri 3/67:55 am
SOF
-
BOS
1 stop13h 10m
Multiple Airlines
Deal found 1/29$371
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Tue 3/38:40 pm
BOS
-
SOF
1 stop14h 40m
Lufthansa
Tue 6/212:55 pm
SOF
-
BOS
1 stop11h 45m
Lufthansa
Deal found 1/28$380
This FlightHub deal was found by Cheapflights users on 1/28. 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.
Wed 3/48:40 pm
BOS
-
SOF
1 stop14h 40m
Multiple Airlines
Tue 5/56:55 pm
SOF
-
BOS
1 stop25h 55m
Multiple Airlines
Deal found 1/28$384
This Mytrip deal was found by Cheapflights users on 1/27. 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 2/168:40 pm
BOS
-
SOF
1 stop19h 05m
Lufthansa
Tue 2/242:00 pm
SOF
-
BOS
1 stop11h 35m
Lufthansa
Deal found 1/27$389
This FlightHub deal was found by Cheapflights users on 1/28. 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 2/241:55 pm
BOS
-
VAR
2 stops18h 20m
Austrian Airlines
Thu 3/194:00 pm
VAR
-
BOS
1 stop29h 05m
Austrian Airlines
Deal found 1/28$397
This FlightHub deal was found by Cheapflights users on 1/28. 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 2/241:55 pm
BOS
-
VAR
2 stops18h 20m
Multiple Airlines
Thu 3/194:00 pm
VAR
-
BOS
2 stops28h 10m
Multiple Airlines
Deal found 1/28$430
This Mytrip deal was found by Cheapflights users on 1/29. 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 3/159:40 pm
BOS
-
VAR
2 stops35h 35m
Lufthansa
Sun 3/224:00 pm
VAR
-
BOS
2 stops52h 10m
Lufthansa
Deal found 1/29$478

Find flight deals from Boston to Bulgaria

Keep the following information in mind while searching for Boston to Bulgaria flight deals. Data was last updated January 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$352
(Kiwi.com)

One-way from

$274
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$561
Provider with most accurate pricing for Boston Logan Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Sofia flights.
Search Deals
From Boston Logan Intl to Bulgaria
Search Deals
One-way flight from Boston Logan Intl to Bulgaria
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($157 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boston to Bulgaria 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 January 30, 2026.
Use the filters below to find and compare flights from Boston to Bulgaria that are best for you.

Fly from

Boston

Fly to

Bulgaria

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Tue 3/3

7:55 am-2:05 pm

1 stop13h 10m

$353

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 2/16

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Fri 3/6

7:55 am-2:05 pm

1 stop13h 10m

$395

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Tue 3/3

7:55 am-2:05 pm

1 stop13h 10m

$395

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Fri 3/6

7:55 am-2:05 pm

1 stop13h 10m

$395

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 2/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Wed 3/4

6:05 am-6:35 pm

1 stop19h 30m

$398

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

11:51 am-1:15 pm

2 stops18h 24m

Sofia

Tue 3/3

7:55 am-2:05 pm

1 stop13h 10m

$400

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

11:51 am-1:15 pm

2 stops18h 24m

Sofia

Wed 3/4

6:05 am-6:35 pm

1 stop19h 30m

$402

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 2/17

11:51 am-1:15 pm

2 stops18h 24m

Sofia

Thu 3/5

6:05 am-6:35 pm

1 stop19h 30m

$402

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 2/16

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Wed 3/4

7:55 am-5:21 pm

2 stops16h 26m

$405

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 2/16

1:55 pm-1:15 pm

2 stops16h 20m

Sofia

Tue 2/24

7:55 am-5:21 pm

2 stops16h 26m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 35 results
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Best time to book a flight from Boston to Bulgaria

Have a flexible travel schedule? Discover the best time to fly to Bulgaria 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 Bulgaria

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

Currently, November is the cheapest month in which you can book a flight from Boston to Bulgaria (average of $356). Flying from Boston to Bulgaria in May is currently the most expensive (average of $645). 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 Bulgaria

Get insights into the airlines that provide service to Bulgaria. 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 Bulgaria. Reviews last updated January 30, 2026.
See what other customers who have flown with KLM, Austrian Airlines, and United Airlines from Boston to Bulgaria have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,443 reviews

Entertainment

7.1

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
KLM
7.7
Good
1,443 reviews
KLM
7.7
Good
1,443 reviews

Entertainment

7.1

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Austrian Airlines
7.5
Good
895 reviews
KLM
7.7
Good
1,443 reviews

Entertainment

7.1

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
United Airlines
7.4
Good
9,215 reviews
KLM
7.7
Good
1,443 reviews

Entertainment

7.1

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Turkish Airlines
7.3
Good
4,208 reviews
KLM
7.7
Good
1,443 reviews

Entertainment

7.1

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.
Lufthansa
6.8
Okay
7,756 reviews
KLM
7.7
Good
1,443 reviews

Entertainment

7.1

Comfort

7.6

Crew

8.4

Food

7.3

Boarding

7.8

Overall

7.7

Reviews

1 / 20
10.0
Excellent

Snapyou,Jan 2026

TPA - LHR

Flight operated by Virgin Atlantic - usual high standard service by Virgin.

Related info for your journey

Find useful and relevant information for your journey from Boston to Bulgaria. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Boston to Bulgaria?

    If you book a flight to Bulgaria from Boston, you will be flying from Logan Intl, which is the city’s only airport. Boston Logan Intl (BOS) is located 2.6 mi from the center of Boston.

  • How long is the flight from Boston to Bulgaria?

    A quick flight from Boston to Bulgaria can take about 19h 05m. United Airlines provides one of the quickest options available for as low as $395. There are 4521 mi between Boston and Bulgaria. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    To fly one-way, consider booking your trip with Austrian Airlines, which is currently one of the cheapest options available, starting at $229. Lufthansa flights start at $374 while deals on KLM start at $385 one-way.

  • What are the most popular routes from Boston to Bulgaria?

    The most popular flight routes from Boston to Bulgaria are Boston Logan Intl - Sofia, Boston Logan Intl - Varna and Boston Logan Intl - Bourgas.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Boston to Bulgaria 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 Bulgaria?

    Currently, November is the cheapest month in which you can book a flight from Boston to Bulgaria (average of $356). Flying from Boston to Bulgaria in May is currently the most expensive (average of $645). 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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Top 9 airlines flying from Boston to Bulgaria

Discover the top 9 airlines that operate flights from Boston to Bulgaria. 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 January 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest$356Average$543FlexibilityNo cancel feeOn-time78%
KLMCheapest$380Average$548FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$396Average$494FlexibilityNo cancel feeOn-time77%
SWISSCheapest$410Average$685FlexibilityNo cancel feeOn-time79%
LufthansaCheapest$417Average$794FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$422Average$714FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$482Average$540FlexibilityNo cancel feeOn-time70%
ITA AirwaysCheapest$505Average$924FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$514Average$962FlexibilityNo cancel feeOn-time77%

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