A historic square with ornate buildings, a prominent cathedral, and a tram in motion.

£289 Cheap Flights from Boston (BOS) to Sofia (SOF)

View £289 flight on Sun, 18 Oct 2026Opens in a new window

Popular airlines from Logan International Airport (BOS) to Sofia Airport (SOF)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 25% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Boston (BOS) to Sofia (SOF)

Prices were available within the past 7 days and start at £289 for one-way flights and £605 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Turkish Airlines
Thu, 24 Sept - Fri, 2 Oct
BOS
Boston
SOF
Sofia
£605 Return, found 3 days ago
£605
Return
found 3 days ago
Select Turkish Airlines flight, departing Thu, 24 Sept from Boston to Sofia, returning Fri, 2 Oct, priced at £605 found 3 days ago
Swiss International Air Lines
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£643 Return, found 6 days ago
£643
Return
found 6 days ago
Select Swiss International Air Lines flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £643 found 6 days ago
Lufthansa
Wed, 12 Aug - Wed, 19 Aug
BOS
Boston
SOF
Sofia
£643 Return, found 2 days ago
£643
Return
found 2 days ago
Select Lufthansa flight, departing Wed, 12 Aug from Boston to Sofia, returning Wed, 19 Aug, priced at £643 found 2 days ago
Swiss International Air Lines
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£645 Return, found 6 days ago
£645
Return
found 6 days ago
Select Swiss International Air Lines flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £645 found 6 days ago
Swiss International Air Lines
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£645 Return, found 6 days ago
£645
Return
found 6 days ago
Select Swiss International Air Lines flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £645 found 6 days ago
Lufthansa
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£648 Return, found 6 days ago
£648
Return
found 6 days ago
Select Lufthansa flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £648 found 6 days ago
Austrian Airlines
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£648 Return, found 6 days ago
£648
Return
found 6 days ago
Select Austrian Airlines flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £648 found 6 days ago
Lufthansa
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£651 Return, found 6 days ago
£651
Return
found 6 days ago
Select Lufthansa flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £651 found 6 days ago
Austrian Airlines
Wed, 24 Mar - Sun, 28 Mar
BOS
Boston
SOF
Sofia
£659 Return, found 6 days ago
£659
Return
found 6 days ago
Select Austrian Airlines flight, departing Wed, 24 Mar from Boston to Sofia, returning Sun, 28 Mar, priced at £659 found 6 days ago
Air Canada
Wed, 12 Aug - Wed, 19 Aug
BOS
Boston
SOF
Sofia
£678 Return, found 2 days ago
£678
Return
found 2 days ago
Select Air Canada flight, departing Wed, 12 Aug from Boston to Sofia, returning Wed, 19 Aug, priced at £678 found 2 days ago

Find the cheapest month to fly from Boston (BOS) to Sofia (SOF)

April is typically the cheapest month to fly

From £284 - £497 per traveller.

Frequently asked questions

How much does a flight from Boston, MA (BOS-Logan Intl.) to Sofia (SOF) cost?
You can find one-way and return flights from BOS to SOF with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when BOS to SOF ticket fares go up or down.
What is the cheapest month to fly from Boston, MA (BOS) to Sofia (SOF)?
The cheapest months to fly from Boston, MA (BOS) to Sofia (SOF) are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Boston, MA (BOS) to Sofia (SOF)?
Enter BOS to SOF and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
Condor is one of the cheapest airlines offering connecting return flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF), with tickets starting from around £1012 for flights that can be booked for departure within the next year. These prices are per adult for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
To find a cheap flight from Boston, MA (BOS-Logan Intl.) to Sofia (SOF), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Boston, MA (BOS) to Sofia (SOF)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
There are around 79 connecting flights per day from Boston Logan International (BOS) to Sofia (SOF). Some common connection points include Pearson International (YYZ), John F. Kennedy International (JFK), and Pierre Elliott Trudeau International (YUL).
What is the earliest flight from Boston, MA (BOS) to Sofia (SOF)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from Boston, MA (BOS) to Sofia (SOF). To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
You'll typically find the most flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF) on a Saturday, with around 70 flights available. This gives you a good selection of options for your travel plans. Major airlines on this route include Delta, United, and American Airlines. Flight options are notably more plentiful on Saturdays compared to other days of the week.
What are the most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
The most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF) are in the afternoon, from 3pm to 6pm. Many major carriers, including Lufthansa, Austrian Airlines and Swiss International Air Lines, offer flights during this window. Many travellers prefer this time as it allows for a full day of activities before heading to the airport, and you'll arrive in Sofia ready to start your day.
How long does it take to fly from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
Flying from BOS to SOF with a connection usually takes about 12 hours, traveling roughly 7,281 kilometers. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
You can fly business class or first class between BOS and SOF. Airlines that offer business class service on this route include:
  • Lufthansa
  • Air France
  • Iberia
  • Turkish Airlines
  • Swiss International Air Lines
  • TAP Portugal
  • British Airways
  • Icelandair
  • Air Canada
  • KLM
  • ITA Airways
  • Aer Lingus
  • Delta
  • Austrian Airlines
  • United
  • Emirates
  • Condor
  • Virgin Atlantic
  • Copa
  • American Airlines
First class cabins are available on Lufthansa, Swiss International Air Lines, and United.
How do I earn miles on a Boston, MA (BOS) to Sofia (SOF) flight with Expedia?
It's easy to earn miles on a Boston, MA (BOS) to Sofia (SOF) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Boston, MA (BOS) to Sofia (SOF) at the last minute?
Typically, booking a last minute flight from Boston, MA (BOS) to Sofia (SOF) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Boston, MA (BOS) to Sofia (SOF) flight and hotel package?
Securing a Boston, MA (BOS) to Sofia (SOF) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
If you booked your Boston, MA (BOS-Logan Intl.) to Sofia (SOF) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Logan Intl.
Destination airport
Sofia
Return price
£605
Distance
7238 km

Book with confidence

Compare flights from Boston to Sofia easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Boston to Sofia. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Sofia in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Logan Intl. to Sofia.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Logan Intl. (BOS) to Sofia (SOF)

The easiest way to view the best deals on flights from Boston to Sofia today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Logan Intl. to Sofia start at just £605 and range up to £678.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Boston and Sofia
  • booking your flight during September, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Boston to Sofia flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Logan Intl. to Sofia for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Boston to Sofia easily and book with confidence

Explore a world of travel with Expedia

*Available to Expedia members.