$326 Cheap Flights from Boston (BOS) to Sofia (SOF)

View $326 flight on Mon, Sep 7, 2026Opens in a new window

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

Cheap Flights from Boston to Sofia (BOS-SOF)

Prices were available within the past 7 days and start at $326 for one-way flights and $614 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Wed, Nov 4 - Wed, Nov 18
BOS
Boston
SOF
Sofia
$614 Roundtrip, found 6 hours ago
$614
Roundtrip
found 6 hours ago
Select Swiss International Air Lines flight, departing Wed, Nov 4 from Boston to Sofia, returning Wed, Nov 18, priced at $614 found 6 hours ago
United
Sun, Nov 1 - Tue, Nov 17
BOS
Boston
SOF
Sofia
$614 Roundtrip, found 2 days ago
$614
Roundtrip
found 2 days ago
Select United flight, departing Sun, Nov 1 from Boston to Sofia, returning Tue, Nov 17, priced at $614 found 2 days ago
Lufthansa
Wed, Nov 4 - Wed, Nov 18
BOS
Boston
SOF
Sofia
$617 Roundtrip, found 6 hours ago
$617
Roundtrip
found 6 hours ago
Select Lufthansa flight, departing Wed, Nov 4 from Boston to Sofia, returning Wed, Nov 18, priced at $617 found 6 hours ago
Air Canada
Mon, Nov 9 - Mon, Nov 23
BOS
Boston
SOF
Sofia
$618 Roundtrip, found 18 hours ago
$618
Roundtrip
found 18 hours ago
Select Air Canada flight, departing Mon, Nov 9 from Boston to Sofia, returning Mon, Nov 23, priced at $618 found 18 hours ago
Austrian Airlines
Tue, Nov 3 - Tue, Nov 17
BOS
Boston
SOF
Sofia
$618 Roundtrip, found 3 days ago
$618
Roundtrip
found 3 days ago
Select Austrian Airlines flight, departing Tue, Nov 3 from Boston to Sofia, returning Tue, Nov 17, priced at $618 found 3 days ago
Austrian Airlines
Tue, Nov 3 - Tue, Nov 17
BOS
Boston
SOF
Sofia
$620 Roundtrip, found 3 days ago
$620
Roundtrip
found 3 days ago
Select Austrian Airlines flight, departing Tue, Nov 3 from Boston to Sofia, returning Tue, Nov 17, priced at $620 found 3 days ago
United
Wed, Nov 4 - Wed, Nov 18
BOS
Boston
SOF
Sofia
$621 Roundtrip, found 6 hours ago
$621
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Nov 4 from Boston to Sofia, returning Wed, Nov 18, priced at $621 found 6 hours ago
British Airways
Tue, Dec 8 - Wed, Feb 10
BOS
Boston
SOF
Sofia
$632 Roundtrip, found 6 days ago
$632
Roundtrip
found 6 days ago
Select British Airways flight, departing Tue, Dec 8 from Boston to Sofia, returning Wed, Feb 10, priced at $632 found 6 days ago
Swiss International Air Lines
Mon, May 11 - Wed, Sep 30
BOS
Boston
SOF
Sofia
$639 Roundtrip, found 2 days ago
$639
Roundtrip
found 2 days ago
Select Swiss International Air Lines flight, departing Mon, May 11 from Boston to Sofia, returning Wed, Sep 30, priced at $639 found 2 days ago
Air Canada
Tue, Dec 1 - Sun, Dec 13
BOS
Boston
SOF
Sofia
$649 Roundtrip, found 1 day ago
$649
Roundtrip
found 1 day ago
Select Air Canada flight, departing Tue, Dec 1 from Boston to Sofia, returning Sun, Dec 13, priced at $649 found 1 day ago

Alternative airports near Sofia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sofia Airport SOF. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $990
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $990

Frequently asked questions

How much does a flight from Boston, MA (BOS-Logan Intl.) to Sofia (SOF) cost?
You can find cheap one-way flights from $326 and cheap return flights from $614 Boston, MA (BOS-Logan Intl.) to Sofia (SOF) with Expedia. One-way flights usually range from $382 to $5584, and return flights typically cost between $504 and $5586. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when Boston, MA (BOS-Logan Intl.) to Sofia (SOF) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
January is the cheapest month to fly from Boston, MA (BOS) to Sofia (SOF), with average round-trip fares around $508. This is about 34% lower than the average price throughout the year, as demand drops after the holiday season. Other budget-friendly months to consider are October and November.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Boston, MA (BOS-Logan Intl.) 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)?
Air Serbia is one of the cheapest airlines offering connecting flights from Boston, MA (BOS) to Sofia (SOF), with round-trip tickets starting from around $970 with a layover in John F. Kennedy Intl. (JFK). 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.*Prices based on flights available on Expedia in the last year.
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-Logan Intl.) to Sofia (SOF)?
For flights from Boston, MA (BOS) to Sofia (SOF), January and November are the best months to travel. You can expect return flights to be around $508 during these times. January is often quieter after the holiday rush, while November offers a chance to enjoy the fall scenery in both cities. This combination of affordability and pleasant travel conditions makes these months particularly appealing.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from BOS to SOF. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Sofia (SOF)?
When flying from Boston, MA (BOS) to Sofia (SOF), the most popular departure times are in the late afternoon, from 3pm to 6pm. About 42% of passengers prefer this time window. Many major carriers, including Lufthansa, Austrian Airlines, and Swiss International Air Lines, offer flights during this window. This timing works well because it allows you to enjoy a full day in Boston before heading to Sofia.
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 4,524 miles. 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 between BOS and SOF. Airlines that offer business class service on this route include:

  • United Airlines
  • Austrian Airlines
  • Lufthansa
  • Swiss International Air Lines
  • Emirates
  • British Airways
  • Turkish Airlines
  • Air Canada
  • Iberia
  • Delta Air Lines

First class cabins are available on:

  • Swiss International Air Lines
  • United Airlines
  • Lufthansa

How do I earn miles on a Boston, MA (BOS-Logan Intl.) to Sofia (SOF) flight with Expedia?
It's easy to earn miles on a Boston, MA (BOS-Logan Intl.) 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-Logan Intl.) to Sofia (SOF) at the last minute?
Typically, booking a last minute flight from Boston, MA (BOS-Logan Intl.) 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-Logan Intl.) to Sofia (SOF) flight and hotel package?
Securing a Boston, MA (BOS-Logan Intl.) to Sofia (SOF) Sofia Vacation Packages 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
Airlines serving
Air Canada, Air France, Air Serbia, Austrian Airlines, British Airways, Emirates, ITA Airways, Iberia, JetBlue Airways, KLM, LOT-Polish Airlines, Lufthansa, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Roundtrip price
$613
Distance
4523 mi

Book with confidence

Boston to Sofia Flights

The cheapest times to fly from Boston to Sofia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boston to Sofia are during the month of November. You can find some of the cheapest flights from Boston to Sofia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boston to Sofia

Sunday is one of the best days to book for cheap flights from Boston to Sofia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Boston to Sofia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boston to Sofia in 2026. You can also book with separate airlines for your outbound and return journeys, from $326 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boston to Sofia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boston to Sofia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Boston to Sofia Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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