$397 Cheap Flights from Boston (BOS) to Sofia (SOF)

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.

*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.

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 December. 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 $397 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.