Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

BOS - SOF

$360 Find cheap flights from Boston to Sofia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Sofia departing on 8/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Wed 5/29
Wed 6/5

Search hundreds of travel sites at once for deals on flights to Sofia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Sofia.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Sofia.
In the last 7 days travelers have searched 43,983,279 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Boston to Sofia (BOS-SOF)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Sofia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
9:50 pm - 8:30 amBOS-SOF
27h 40m1 stop
3:45 pm - 7:55 pmSOF-BOS
35h 10m1 stop
$656Turkish Airlines
Find Deal
Wed, Aug 7 - Mon, Sep 16
9:50 pm - 8:20 pmBOS-SOF
15h 30m1 stop
3:45 pm - 7:55 pmSOF-BOS
35h 10m1 stop
$695Turkish Airlines
Find Deal
Sun, Sep 1 - Mon, Sep 16
10:00 pm - 7:00 pmBOS-SOF
14h 00m1 stop
5:30 pm - 1:50 pmSOF-BOS
26h 20m1 stop
$725British Airways
Find Deal
Fri, Oct 18 - Thu, Oct 31
5:35 pm - 7:00 pmBOS-SOF
18h 25m2 stops
5:30 pm - 1:50 pmSOF-BOS
26h 20m1 stop
$729British Airways
Find Deal
Fri, Oct 18 - Thu, Oct 31
9:05 am - 11:00 pmBOS-SOF
30h 55m3 stops
6:05 am - 1:09 amSOF-BOS
26h 04m2 stops
$762United Airlines
Find Deal
Fri, Oct 25 - Fri, Nov 8
8:05 pm - 11:00 pmBOS-SOF
19h 55m1 stop
12:55 pm - 5:50 pmSOF-BOS
11h 55m1 stop
$828Lufthansa
Find Deal
Tue, Aug 27 - Tue, Sep 10
8:05 pm - 11:00 pmBOS-SOF
19h 55m1 stop
7:30 pm - 5:50 pmSOF-BOS
29h 20m1 stop
$836Lufthansa
Find Deal
Mon, Jul 15 - Mon, Sep 2
5:10 pm - 2:55 pmBOS-SOF
14h 45m1 stop
2:10 pm - 8:05 pmSOF-BOS
12h 55m1 stop
$837SWISS
Find Deal
Sun, Aug 11 - Wed, Aug 28
5:10 pm - 6:45 pmBOS-SOF
18h 35m2 stops
2:10 pm - 8:05 pmSOF-BOS
12h 55m1 stop
$856SWISS
Find Deal
Sun, Aug 11 - Wed, Aug 28
5:10 pm - 6:45 pmBOS-SOF
18h 35m2 stops
6:00 am - 5:50 pmSOF-BOS
18h 50m1 stop
$859United Airlines
Find Deal
Sun, Aug 11 - Thu, Aug 29

Flights from Boston to Sofia - Travel Insights & Trends

Get data-powered insights and trends into flights from Boston to Sofia to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Boston to Sofia?

The average price of all flights from Boston to Sofia clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Sofia on a Tuesday and more expensive on a Friday. On your return trip to Boston, you should consider flying back on a Thursday, and avoid Tuesdays for better deals.

What is the cheapest month to fly from Boston to Sofia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Boston to Sofia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Boston to Sofia is February, where tickets cost $532 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is $1,483 and $1,356 respectively.

How far in advance should I book a flight from Boston to Sofia?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Boston to Sofia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Boston to Sofia, you should book around 3 days before departure. For the absolute cheapest price, our data suggests you should book 15 days before departure.

Which airlines provide the cheapest flights from Boston to Sofia?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The cheapest return flight ticket from Boston to Sofia found by KAYAK users in the last 72 hours was for $656 on Turkish Airlines, followed by ITA Airways ($721). One-way flight deals have also been found from as low as $462 on Turkish Airlines and from $2,283 on Air Serbia.

Good to know

Low season

January

High season

August

Cheapest flight

$360
Best time to beat the crowds with an average 39% drop in price.
Most popular time to fly with an average 22% increase in price.
Flight from Boston to Sofia

When to book flights from Boston to Sofia

Are your dates flexible? Find out the best times to travel from Boston to Sofia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Boston to Sofia

  • What are the layover options on the flight route from Boston to Sofia?

    Your layover will automatically depend on the airline you’re traveling with because each airline on this route has its preferred airport for layovers. For example, Turkish Airlines has all its layovers on this route scheduled for Istanbul. Similarly, Lufthansa has its layovers scheduled for Frankfurt or Munich while SWISS Airlines is scheduled for Zurich.

  • Do I need a visa to fly to Sofia?

    As it stands, U.S. citizens traveling to Bulgaria are not required to carry visas on entry as long as they are traveling on a regular passport and don’t plan on staying for longer than 90 days. In fact, the only mandatory requirement is your passport, with a validity of at least three months beyond the departure date from Bulgaria and one blank page for entry stamps.

  • Is public transport available from Sofia International Airport (SOF)?

    Access to the city center from Sofia Airport is possible through a range of options including bus, metro, and taxi. Taking a taxi is the most convenient although the bus and metro offer an affordable option. The metro in particular is a faster option and typically operates round the clock at intervals of fifteen minutes. To catch the metro, head over to the Airport Metro Station located in Terminal 2 and take the Metro line M2, which leads directly to the city center station Serdika.

  • Which is the most sustainable airline flying this route?

    In these modern times, it is pivotal that we think about the environment. While flying is by no means a sustainable way to travel, there are measures we can take to make our trips more sustainable, and it starts with using a sustainable airline. Lufthansa and American Airlines are a few of the airlines serving this route that have already adopted the use of Sustainable Aviation Fuel.

  • What is the cheapest flight from Boston to Sofia?

    In the last 3 days, the lowest price for a flight from Boston to Sofia was $360 for a one-way ticket and $656 for a round-trip.

  • Do I need a passport to fly between Boston and Sofia?

    Yes

  • Which airports will I be using when flying from Boston to Sofia?

    When flying out of Boston you will be using Boston Logan Intl. You will be landing at Sofia, also known as Sofia.

  • Which aircraft models fly most regularly from Boston to Sofia?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boston to Sofia?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Boston and Sofia, with Star Alliance being the most commonly used for this route.

  • What is the most popular layover when flying to Sofia from Boston?

    Frankfurt am Main is the most popular layover city among KAYAK users traveling from Boston to Sofia.

  • Which is the best airline for flights from Boston to Sofia, SWISS or Austrian Airlines?

    The two airlines most popular with KAYAK users for flights from Boston to Sofia are SWISS and Austrian Airlines. With an average price for the route of $1,088 and an overall rating of 7.8, SWISS is the most popular choice. Austrian Airlines is also a great choice for the route, with an average price of $1,061 and an overall rating of 7.5.

  • How does KAYAK find such low prices on flights from Boston to Sofia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Sofia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Sofia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Sofia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Boston with another airline. Booking your flights between Boston and SOF can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Sofia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from BOS to Sofia

  • Business travelers looking to work while flying should book their flights with Lufthansa. It provides Wi-Fi to all passengers, allowing you to browse the internet, send emails, and check your social media while flying.
  • To get access to an airport lounge during your layover, consider booking your flight with an airline that has a lounge at the airport. For example, when you book with Lufthansa, you can access the Lufthansa Senator Lounge during your layover at Frankfurt Airport.
  • When you book an economy-class ticket with United Airlines, you can be upgraded to the next class at a lower cost compared to what you would’ve paid if you booked a first-class ticket from the get-go.
  • If you have booked your flight with Turkish Airlines, consider upgrading with the EcoFly promotion and get two checked bags plus a carry-on inclusive of your ticket instead of just one carry-on bag.
  • A quick way into Boston Logan International Airport (BOS) from downtown Boston is via taxi. They are available at every corner of the city and will take you directly to the airport terminal. When rush hour traffic is a problem, the Blue Line from South Station offers a great alternative.
See more tips

Top 5 airlines serving from Boston to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Boston to Sofia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boston to Sofia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
SWISSOverall score based on 2043 reviews
7.4Food
7.2Entertainment
7.9Boarding
7.6Comfort
8.4Crew
Airline reviews

Horrible experience. They "GAME" with seats they decided to play where you can`t select or get seat during check-in without paying and then forcing you to stay long line at the Customer Service at the gate to get a boarding ticket with seat assigned is pathetic. Will never fly with United again!

2.0 MediocreAnonymous, Apr 2024DEN - ORD
Read more about SWISS reviews

Horrible experience. They "GAME" with seats they decided to play where you can`t select or get seat during check-in without paying and then forcing you to stay long line at the Customer Service at the gate to get a boarding ticket with seat assigned is pathetic. Will never fly with United again!

So terrible. They would not rebook me for a flight until 2 days. I had to spend so much money to get my own flight. They were rude and not helpful.

Overall a good experience, the flight was on time, the crew very attentive and friendly. However the seats are too cramped, there is no space, and as soon as the person in front reclines the seat, it's literally in your face.

Bag lost. Lost bag recovery process is an unsatisfying customer experience. Because 1) bag is still lost but also 2) the process is outdated and form-heavy and 3) in our case also involved a long line.

Flight canceled Terrible Post flight management Kept in airport 1 hours with promises of transport but none came

We were very impressed with Swiss Air. The service was exceptional. Unfortunately, we had a baby behind us that screamed for hours. , It was a nightmare, though I completely understand that it was not Swiss Airs fault.

We had to move to terminal 5 for the next part of our trip. Very un-organized and difficult.

Missed connecting train since flight was late into Zurich and I had to stay at airport hotel because of it as well as I had to repurchase train ticket

Cons: "Flight was completely full and certain passengers were belligerent about wearing face masks. The cabin crew did not enforce mask wearing, stating “we are not the police”"
Pros: "Nothing. There was no flight. The flight was cancelled and you did not notify us. We found it out ourselves by accident. We tried to contact you guys but we could not call or anything other. You guys suck"
Cons: "Notify your customers when the flight is cancelled. Thats the least you can do. Very unprofessional"

Only chicken as a meat dish through out the flight

Nothing really was great as such. Seen other no name airlines perform better.

Quality of service on board was very inconsistent. FA service primarily seemed robotic and they barely engaged with passengers

I’m unclear why I had to pay extra for assigned seats as Turkish airlines did not honor the seating. We were placed across the aisle from each other on TK 34, and were seated behind one another on TK 694. Because my name was misspelled on e-ticket (Klawiter, instead of Klawitter) I could not log onto website to get the connection gate number in Istanbul. The monitors in the airport were a jumbled mess 1/2 Arabic and 1/2 English.

On line check in needs a lot of improvement. I tried and gave up.

Food not good, flight attendants not the best, not accommodating very ruff

the female flight attendant was racist towards me. I could tell she treated the two other passengers next to me with more softness.

Oh my god! For an13 hour flight they serve you food just one time. Also don’t be thirsty they give you a little small cup of soda to drink. They seem like their goal is to feed you one so they don’t have to be bothered with you. It quite surprise for such a long flight there are several times to eat at least three and the food was well lackluster. The food and lack of offering drinks which were always hot no ice provided.

We were traveling first class. Checkin counter lady and her manager, both were in bad mood and did not treat us well about checking in the handbag. The gate agent took care of it right away. I travel Turkish twice a year in first class. No one has ever refused to check in the hand bag. Not sure, why this agent and her manager refused. Everything else was excellent.

The 787 economy was a disaster for long haul. The space was too little compared to 777 or 747. Also the extremely low tray table behind the seat made any dining effort a nightmare. However, the movies were up to date, and the food taste was good, despite of terrible serving process caused by small space.

Great! The plane was decently sized and comfortable. The staff was nice and there was great in flight entertainment

Food was terrible Not many options Stewards dont care Delay

Water service would be great. The way they board is terrible. Slow passengers first😂😂 They need to smart up a bit

Our original business class flight was cancelled so we not only downgraded but we were also spread out across the plane not sitting together in separate middle seats. My poor kids were scared and couldn’t see me on the flight and the crew wasn’t sensitive to the situation and what the airlines did to us. Very dissatisfied with United airlines.

Crew were fine, drinks and snacks were as well but we were delayed for around 2 hrs which made our entry into Mexico delayed as well with the influx of arrivals at the same time. Sort of wasted our first day of vacation. We left Pittsburgh at 630am and did not arrive in Mexico until late dinner time.

The ride was good but no food ot entertainment hence, it was just over an hour flight.

There was a group of school age passengers that were very loud and unruly with their chaperones were no where to be found.

Boarding was unorganized. They expected passengers to ask people to move their assigned seat they paid for in order to sit together. The seats even in comfort are smaller than other airlines and the flight attendants appeared not to be well prepared

The WiFi didn’t work and the seats are too close together. Very uncomfortable.

I was told we'd have a hot breakfast option in first class, so I chose not get a hot breakfast. It was a very strange meal, but the fresh fruit was very good quality. Service was excellent from ORD to ELP. No service from MBS to ORD, not even water. However, when flying American from FNT to ORD, which is a shorter flight, they at least pass out snacks and offer water.

Seats were not the most comfortable and food options weren’t great but overall but everything else was excellent

Check-in very easy and smooth. Plane and crew were nice. Seat open next to me created more space. Food was fair but plentiful. Lots of movies and I was able to sleep some on the way to Munich. Very tight connection, about an hour. Fast through passport control and a bit of a walk to last G terminal gate but I made my connection to Palma. Unfortunately, my luggage did not make it. It is now almost 24 hours since I anded and still NO luggage. I know it landed last night on another flight. Local delivery should be today to my hotel in Palma but nothing yet. I asked about the tight connection when I checked in and was assured they would get my luggage to the connecting flight. Very disappointing it missed my flight but more disappointing that it has taken so long to arrive. Failure on the airlines and service to get my luggage to date.

I wish the flight attendant was a little bit kinder

The food wasn’t great and it would be nice if the airlines showed documentaries about the countries we are flying into.

Disappointed everytime. The app doesn't load the boarding passes. They have lots of agent that seem to be busy doing nothing with a long line waiting to get paper boarding passes. Food choices are poor. Entertainment is less than entertaining.

Horrible experience. Nothing to give to kids to keep them entertained.

I think I have bruises on my kneecaps. Do the seats have to be so close together these days? And if they are so close they really shouldn’t recline. I think when the gentleman in front of me reclined, the back of his head was on my chin. That being said the crew were always caring and polite, and the flight was on time and very safe. So I’m grateful for that.

I always try to book flights that don’t charge for baggage. Yet I was charged $75 for this flight.

Trouble keeps changing the time and I was booked different flight without knowing it was bad experience

I dropped my wallet under my seat on this flight with all of my money and credit card. I requested to be able to go back and retrieve it but Lufthansa denied my request. I went to the Customer Services and they called Lost and Found but I was told nothing found would be turned in until around 12:00pm. My next flight was leaving so I was unable to check to see if my wallet was turned in. I will never fly with Lufthansa again.

Not connecting flights. Missed my flight from Dublin to Liverpool because I arrived at Dublin one hour too late. For this mistake, they offered me a flight from Dublin to Manchester. Thats great and all, but I waste time and money to commute to Liverpool. Be sure to check the time of your connecting flights, because they sure don’t when they sell it to you

Excellent! Great flight attendants, good food (in business class, at least), very comfortable. Touchscreen and remote wasn’t great.

In economy and food was ok, but with limited leg space (and I was in a 2 seat configuration) it was difficult to eat with a tiny seat tray. I spilt wine on my trousers. First time on British Air (I usually fly Turkish Air) and in a 777. Heathrow was pleasant but changing terminals awkward.

Starting with the flight Cairo to London the plain was so poor no entertainment at all uncomfortable seats although it’s 5 hours long,then an American airline plain took me from London to Miami it was a bad experience the crew most of flight time not available and they asked us to help our selves for any snacks if we need. From Miami to London actually was perfect flight with a huge plain and perfect crew but from London to Cairo was horrible plain with stiff fixed seats not movable no entertainment or wi fi very poor Menu which is unacceptable for a business class

I've done hundreds of flights in my life, and this flight was one of the best I've ever taken, From beginning to end, everything went smoothly, professionally, and with a smile and friendly attitude from all employees I interacted with. The food was delicious (and free), as were the drinks. There was just a genial and effective way in the way that British Airways organized the flight -that reminded of days in the 70's, 80's, and 90's, when flying was a fun, and exciting adventure. I enjoyed and had confidence in the abilities of the flight crew, I'll be flying British Airways several more times this summer. Thank you so much for the great experience! Cheryl Olso

My baggage did not arrived with me. Took 3 days to get it after so may calls and follow up

Terrible! I missed my flight to my final destination and British airlines and American Airlines keep pointing fingers on each other’s. Nobody wants to take responsibility

Terrible. Flight was 3 hours delayed and I missed my other flight to my final destination

Overall, terrific service, accommodations, and experience. Only reason comfort was rated lower was because it was difficult to keep a comfortable sleeping position for the overnight flight, but I also had an economy seat.

Not sure if the crew were experiencing something unknown to me,but the service of passing water was non-existent.In addition,please take consideration when providing yogurt as alternative for breakfast as some of us, could be lactose intolerant.. thanks

Book cheap flights from Boston to Sofia

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Boston to Sofia found on KAYAK in the last 72 hours.
8/13Tue
2 stops
17h 10mBOS-SOF
$360
8/13Tue
3 stops
24h 40mBOS-SOF
$373
5/15Wed
3 stops
42h 50mBOS-SOF
$416
5/15Wed
2 stops
28h 26mBOS-SOF
$433
8/10Sat
1 stopTurkish Airlines
15h 30mBOS-SOF
$462
8/13Tue
1 stop
12h 10mBOS-SOF
$532
8/10Sat
2 stopsTurkish Airlines
17h 15mBOS-SOF
$544
5/15Wed
1 stop
23h 25mBOS-SOF
$615
10/19Sat
2 stopsAir Serbia
18h 55mBOS-SOF
$2,283
10/19Sat
1 stopTurkish Airlines
27h 40mBOS-SOF
$3,163

Search by stops

Search by airline

Search by price

Last minute flights from Boston to Sofia

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Boston to Sofia that are departing in the next 10 days.
5/4Sat
multi-stop
24h 40mBOS-SOF
5/12Sun
multi-stop
22h 10mSOF-BOS
$766
4/30Tue
multi-stopITA Airways
18h 30mBOS-SOF
5/5Sun
multi-stopITA Airways
26h 40mSOF-BOS
$819
5/1Wed
multi-stopBritish Airways
18h 20mBOS-SOF
5/5Sun
multi-stopBritish Airways
21h 55mSOF-BOS
$860
5/2Thu
multi-stopBritish Airways
11h 15mBOS-SOF
5/6Mon
multi-stopBritish Airways
31h 54mSOF-BOS
$870
5/1Wed
multi-stopLufthansa
15h 05mBOS-SOF
5/6Mon
multi-stopLufthansa
16h 35mSOF-BOS
$879
5/2Thu
multi-stopLufthansa
12h 20mBOS-SOF
5/11Sat
multi-stopLufthansa
12h 30mSOF-BOS
$880
4/30Tue
multi-stopUnited Airlines
19h 30mBOS-SOF
5/6Mon
multi-stopUnited Airlines
12h 30mSOF-BOS
$887
5/2Thu
multi-stopUnited Airlines
19h 20mBOS-SOF
5/7Tue
multi-stopUnited Airlines
16h 42mSOF-BOS
$893
4/30Tue
multi-stopTurkish Airlines
34h 05mBOS-SOF
5/4Sat
multi-stopTurkish Airlines
35h 10mSOF-BOS
$1,271
5/4Sat
multi-stopTurkish Airlines
34h 05mBOS-SOF
5/7Tue
multi-stopTurkish Airlines
29h 45mSOF-BOS
$1,461

Search by stops

Search by airline

Search by price

Boston - Sofia Flights

Departure:

Boston (BOS)United States

Destination:

Sofia (SOF)Bulgaria

Return flight deals:

Sofia - Boston

Cabin classes:

Browse destinations: