$328 Cheap Flights from Boston (BOS) to Sofia (SOF)

View $328 flight on Wed, Mar 24, 2027Opens 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 $328 for one-way flights and $650 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Mon, Oct 19 - Tue, Nov 3
BOS
Boston
SOF
Sofia
$650 Roundtrip, found 5 days ago
$650
Roundtrip
found 5 days ago
Select Swiss International Air Lines flight, departing Mon, Oct 19 from Boston to Sofia, returning Tue, Nov 3, priced at $650 found 5 days ago
Lufthansa
Tue, Dec 1 - Wed, Mar 31
BOS
Boston
SOF
Sofia
$652 Roundtrip, found 4 days ago
$652
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Tue, Dec 1 from Boston to Sofia, returning Wed, Mar 31, priced at $652 found 4 days ago
Swiss International Air Lines
Wed, Oct 28 - Wed, Nov 11
BOS
Boston
SOF
Sofia
$653 Roundtrip, found 1 day ago
$653
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Wed, Oct 28 from Boston to Sofia, returning Wed, Nov 11, priced at $653 found 1 day ago
United
Mon, Oct 19 - Tue, Nov 3
BOS
Boston
SOF
Sofia
$653 Roundtrip, found 5 days ago
$653
Roundtrip
found 5 days ago
Select United flight, departing Mon, Oct 19 from Boston to Sofia, returning Tue, Nov 3, priced at $653 found 5 days ago
Lufthansa
Sun, Nov 1 - Mon, Nov 9
BOS
Boston
SOF
Sofia
$655 Roundtrip, found 6 days ago
$655
Roundtrip
found 6 days ago
Select Lufthansa flight, departing Sun, Nov 1 from Boston to Sofia, returning Mon, Nov 9, priced at $655 found 6 days ago
Lufthansa
Sun, Nov 15 - Mon, Nov 23
BOS
Boston
SOF
Sofia
$655 Roundtrip, found 3 days ago
$655
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Sun, Nov 15 from Boston to Sofia, returning Mon, Nov 23, priced at $655 found 3 days ago
Lufthansa
Mon, Nov 23 - Wed, Jan 20
BOS
Boston
SOF
Sofia
$656 Roundtrip, found 1 day ago
$656
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Mon, Nov 23 from Boston to Sofia, returning Wed, Jan 20, priced at $656 found 1 day ago
Austrian Airlines
Mon, Apr 5 - Mon, Apr 12
BOS
Boston
SOF
Sofia
$657 Roundtrip, found 1 day ago
$657
Roundtrip
found 1 day ago
Select Austrian Airlines flight, departing Mon, Apr 5 from Boston to Sofia, returning Mon, Apr 12, priced at $657 found 1 day ago
British Airways
Sun, Nov 8 - Wed, Nov 18
BOS
Boston
SOF
Sofia
$671 Roundtrip, found 4 days ago
$671
Roundtrip
found 4 days ago
Select British Airways flight, departing Sun, Nov 8 from Boston to Sofia, returning Wed, Nov 18, priced at $671 found 4 days ago
Air Canada
Sun, Nov 15 - Mon, Nov 23
BOS
Boston
SOF
Sofia
$678 Roundtrip, found 3 days ago
$678
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Nov 15 from Boston to Sofia, returning Mon, Nov 23, priced at $678 found 3 days 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 $1,129
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $1,129

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

May is typically the cheapest month to fly

From $609 - $1,386 per traveler.

What you need to know for your flight from Logan Intl. to Sofia

Boston (BOS) to Sofia (SOF) at a glance

Travel between Boston (BOS) and Sofia (SOF) with a selection of airlines catering to this international long-haul route. You can choose from both full-service and budget carriers to discover the best itinerary that suits your travel plans, budget, and schedule while you visit Sofia's iconic attractions and neighborhoods. Get all the essential flight information for departures from Logan International Airport (BOS) to Sofia Airport (SOF).

  • Fastest flight duration: around 9h 30m in-flight, plus roughly 2h 30m layover with one stop
  • Route distance: roughly 4,500 miles (7,240 km)
  • Flights per week: around 10 departures on average
  • Typical fares (one-way): economy tickets often range from $215–$710, depending on seasonality and how far ahead you book

Flights from Logan International Airport (BOS) to Sofia Airport (SOF)

Based on recent traveler bookings, here are the top airlines favored for journeys from Boston to Sofia, particularly for one-stop and multi-stop flights. Common layovers include Frankfurt International Airport (FRA) with an approximately 3-hour stop, Vienna International Airport (VIE) around 2 hours, and Schiphol Airport (AMS) at about 2 hours and 15 minutes. These options allow you to balance factors like price, total travel time, and cabin class to create the ideal travel itinerary.

  • Lufthansa: This full-service airline provides convenient one-stop flights, with one-way prices generally falling between $215 and $705. It represents about 26% of departures on this route, featuring an in-flight duration of 9 hours and 30 minutes, and an overall travel time of approximately 12 hours and 15 minutes, including layovers.
  • United: Another full-service option, United offers both one-stop and multi-stop itineraries, with one-way fares usually ranging from $225 to $710. Covering around 21% of flights on this route, passengers can expect a flight time of 9 hours and 30 minutes, culminating in a total journey time of roughly 12 hours and 15 minutes.
  • Austrian Airlines: Known for its full-service offerings, Austrian Airlines provides one-stop flights with fares that typically range from $215 to $670. Accounting for approximately 13% of departures on this route, travelers will spend about 9 hours and 30 minutes in the air, with a total elapsed time of around 12 hours and 15 minutes including layovers.
  • Turkish Airlines: As a full-service airline, Turkish Airlines offers one-stop journeys, with one-way ticket prices fluctuating between $275 and $1210. This carrier represents about 11% of the route's departures, featuring an in-flight time of 9 hours and 30 minutes, leading to a total travel duration of roughly 12 hours and 15 minutes.
  • KLM: This full-service carrier presents one-stop flights with one-way fares generally ranging from $235 to $650. KLM makes up about 10% of the departures on this route, with an in-flight time of 9 hours and 30 minutes and a complete travel time of approximately 12 hours and 15 minutes, including layovers.

Best time to fly from Boston (BOS) to Sofia (SOF)

The most popular months for travelers flying from Boston to Sofia are June, July, and August, when peak temperatures in Sofia reach up to 70.7°F in August. If you prefer quieter travel, consider October, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 52.2°F. For better deals, September usually offers the lowest average one-way fare around $307. Flight availability peaks in July, with approximately 13 flights per week, making it easier to find convenient departure times. January has the fewest flights, with approximately 8 flights per week.

  • Cheapest time to fly: September usually offers good deals with average one-way fare around $307, roughly 45% cheaper than the yearly average.
  • Another budget-friendly time to fly: October typically offers an average one-way fare of around $321.
  • Most flight options: July has the highest number of flights from Boston to Sofia, with approximately 13 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January30.2°F (-1.0°C)Low8$359
February34.3°F (1.3°C)Average9$640
March40.8°F (4.9°C)Average9$369
April49.6°F (9.8°C)Average9$415
May57.7°F (14.3°C)Average10$576
June64.9°F (18.3°C)High11$584
July70.0°F (21.1°C)High13$458
August70.7°F (21.5°C)High12$398
September62.6°F (17.0°C)Average9$307
October52.2°F (11.2°C)Low10$321
November43.7°F (6.5°C)Low11$1769
December34.2°F (1.2°C)Average11$528

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative route from Boston (BOS) to Sofia (SOF)

  • Bedford to Sofia (BED-SOF): Laurence G. Hanscom Field Airport (BED) lies approximately 15 miles from Logan International Airport (BOS), providing a convenient departure point for travelers heading to Sofia.

How to find the best prices for flights from Boston (BOS) to Sofia (SOF)

Getting some of the best deals on flights from Boston to Sofia is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually available when booking 2-8 weeks in advance, though most travelers tend to book at least 2 months ahead. Evening departures from 6 PM to 12 AM often offer lower prices, while afternoon flights from 12 PM to 6 PM are the most popular. Additionally, flying on Tuesday provides both cheaper prices and is the most favored travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Sofia Airport from Logan International Airport

Sofia welcomes travelers from Boston with a range of transport options based on price, convenience, and proximity. Here's how to reach Sofia efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Sofia, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Sofia Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Sofia Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Sofia Airport, Sofia Airport Terminal 2 Station, a metro station, is located about 0.7 miles away by car, while Sofia Seaport, a seaport, is approximately 4.6 miles away by car, and Sofia Central Station, a train station, is around 5 miles away by car, providing convenient access to various modes of transport for your onward journey.

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 $328 and cheap return flights from $650 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
Roundtrip price
$650
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 October. 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 $328 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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