$323 Cheap Flights from Boston (BOS) to Sofia (SOF)

View $323 flight on Sun, Feb 8, 2026Opens in a new window

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

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Cheap Flights from Boston to Sofia (BOS-SOF)

Prices were available within the past 7 days and start at $323 for one-way flights and $387 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Mon, Apr 27 - Tue, May 5
BOS
Boston
SOF
Sofia
$387 Roundtrip, found 1 day ago
$387
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, Apr 27 from Boston to Sofia, returning Tue, May 5, priced at $387 found 1 day ago
Swiss International Air Lines
Mon, Oct 20 - Thu, Nov 20
BOS
Boston
SOF
Sofia
$390 Roundtrip, found 1 day ago
$390
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, Oct 20 from Boston to Sofia, returning Thu, Nov 20, priced at $390 found 1 day ago
Swiss International Air Lines
Mon, Apr 27 - Tue, May 5
BOS
Boston
SOF
Sofia
$390 Roundtrip, found 1 day ago
$390
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, Apr 27 from Boston to Sofia, returning Tue, May 5, priced at $390 found 1 day ago
Swiss International Air Lines
Wed, Mar 11 - Wed, Mar 18
BOS
Boston
SOF
Sofia
$391 Roundtrip, found 5 hours ago
$391
Roundtrip
found 5 hours ago
Select Swiss International Air Lines flight, departing Wed, Mar 11 from Boston to Sofia, returning Wed, Mar 18, priced at $391 found 5 hours ago
United
Mon, Dec 1 - Tue, Dec 9
BOS
Boston
SOF
Sofia
$392 Roundtrip, found 5 hours ago
$392
Roundtrip
found 5 hours ago
Select United flight, departing Mon, Dec 1 from Boston to Sofia, returning Tue, Dec 9, priced at $392 found 5 hours ago
Swiss International Air Lines
Wed, Feb 18 - Fri, Mar 13
BOS
Boston
SOF
Sofia
$392 Roundtrip, found 4 days ago
$392
Roundtrip
found 4 days ago
Select Swiss International Air Lines flight, departing Wed, Feb 18 from Boston to Sofia, returning Fri, Mar 13, priced at $392 found 4 days ago
Lufthansa
Tue, Nov 4 - Tue, Nov 18
BOS
Boston
SOF
Sofia
$392 Roundtrip, just found
$392
Roundtrip
just found
Select Lufthansa flight, departing Tue, Nov 4 from Boston to Sofia, returning Tue, Nov 18, priced at $392 just found
Lufthansa
Wed, Oct 29 - Wed, Nov 12
BOS
Boston
SOF
Sofia
$393 Roundtrip, found 3 days ago
$393
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Wed, Oct 29 from Boston to Sofia, returning Wed, Nov 12, priced at $393 found 3 days ago
Air Canada
Sun, Mar 22 - Tue, Mar 31
BOS
Boston
SOF
Sofia
$395 Roundtrip, found 12 hours ago
$395
Roundtrip
found 12 hours ago
Select Air Canada flight, departing Sun, Mar 22 from Boston to Sofia, returning Tue, Mar 31, priced at $395 found 12 hours ago
Austrian Airlines
Tue, Nov 4 - Tue, Nov 18
BOS
Boston
SOF
Sofia
$398 Roundtrip, just found
$398
Roundtrip
just found
Select Austrian Airlines flight, departing Tue, Nov 4 from Boston to Sofia, returning Tue, Nov 18, priced at $398 just found

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

November is typically the cheapest month to fly

From $390 - $1,126 per traveler.

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 $442
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $442
Flights from Boston (BOS) to Sofia (SOF)
Origin airport
Logan Intl.
Destination airport
Sofia
Airlines serving
Air Canada, Air France, 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
$387
Distance
4523 mi

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 April. 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 2025. You can also book with separate airlines for your outbound and return journeys, from $323 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.

 

Frequently asked questions

How much does a flight from Logan Intl. Airport (BOS) to Sofia Airport (SOF) cost?
Get a cheap one-way flight from $323 or cheap return flight from $387 from Logan Intl. Airport (BOS) to Sofia Airport (SOF) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Logan Intl. Airport (BOS) to Sofia Airport (SOF)?
The cheapest month to fly from BOS to SOF is April, when there's less demand. Off-peak months are usually when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Logan Intl. Airport (BOS) to Sofia Airport (SOF)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find the carrier with the cheapest BOS to SOF flight.
How many flights per day from Logan Intl. Airport (BOS) to Sofia Airport (SOF)?
You'll need to catch a flight with a layover if you're traveling from Logan Intl. Airport (BOS) to Sofia Airport (SOF). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from BOS to SOF?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Logan Intl. Airport (BOS) to Sofia Airport (SOF)?
To avoid possible delays on the Logan Intl. Airport (BOS) to Sofia Airport (SOF) route, fly before 3 PM. Later departures have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Logan Intl. Airport (BOS) to Sofia Airport (SOF) last-minute?
Booking your flight from BOS to SOF shortly before your trip is generally more expensive. But if you're flexible with your travel times and dates, you could snag a cheap last-minute fare.
Is it cheaper to book a BOS to SOF flight and hotel package?
You can save money by booking a BOS to SOF flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've chosen your preferred flights and accommodations, consider other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Logan Intl. Airport (BOS) to Sofia Airport (SOF)?
Generally, it's possible to reschedule or cancel your BOS to SOF flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.