SOF - BOS

$402 Find Cheap Flights from Sofia to Boston

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sofia to Boston departing on 4/27. 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
1 adult, Economy, 0 bags

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sofia to Boston.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sofia to Boston.
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Flight Deals

Cheap Flights from Sofia to Boston (SOF-BOS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Sofia to Boston 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Sofia to Boston

Thu, Dec 25 - Wed, Feb 25
Multiple Airlines Logo
2:35 pm - 11:54 pmSOF-BOS
16h 19m2 stops
Multiple Airlines Logo
9:50 pm - 3:15 pmBOS-SOF
10h 25m1 stop
$637Multiple Airlines
Find Deal
Thu, Dec 25 - Wed, Feb 25
Austrian Airlines Logo
6:45 pm - 2:05 pmSOF-BOS
26h 20m1 stop
Austrian Airlines Logo
1:55 pm - 11:50 amBOS-SOF
14h 55m2 stops
$645Austrian Airlines
Find Deal
Tue, Dec 2 - Wed, Dec 10
United Airlines Logo
6:00 am - 1:25 pmSOF-BOS
14h 25m1 stop
United Airlines Logo
9:30 am - 10:45 pmBOS-SOF
30h 15m2 stops
$657United Airlines
Find Deal
Wed, Dec 24 - Mon, Feb 23
United Airlines Logo
6:10 am - 1:25 pmSOF-BOS
14h 15m1 stop
United Airlines Logo
8:40 pm - 10:45 pmBOS-SOF
19h 05m1 stop
$660United Airlines
Find Deal
Thu, Dec 25 - Wed, Feb 25
Lufthansa Logo
2:00 pm - 6:35 pmSOF-BOS
11h 35m1 stop
Lufthansa Logo
8:40 pm - 6:20 pmBOS-SOF
14h 40m1 stop
$670Lufthansa
Find Deal
Thu, Dec 25 - Thu, Feb 26
Lufthansa Logo
2:00 pm - 6:35 pmSOF-BOS
11h 35m1 stop
Lufthansa Logo
8:40 pm - 10:45 pmBOS-SOF
19h 05m1 stop
$671Lufthansa
Find Deal
Thu, Nov 20 - Wed, Dec 10
KLM Logo
7:00 am - 1:20 pmSOF-BOS
13h 20m1 stop
KLM Logo
7:10 pm - 2:05 pmBOS-SOF
11h 55m1 stop
$681KLM
Find Deal
Thu, Dec 25 - Mon, Feb 23
Turkish Airlines Logo
9:35 am - 6:05 pmSOF-BOS
15h 30m1 stop
Turkish Airlines Logo
8:00 pm - 8:50 pmBOS-SOF
17h 50m1 stop
$734Turkish Airlines
Find Deal
Tue, Dec 23 - Wed, Feb 25
Turkish Airlines Logo
9:35 am - 6:05 pmSOF-BOS
15h 30m1 stop
Turkish Airlines Logo
8:00 pm - 8:50 pmBOS-SOF
17h 50m1 stop
$735Turkish Airlines
Find Deal
Thu, Nov 20 - Wed, Dec 10
KLM Logo
7:00 am - 1:20 pmSOF-BOS
13h 20m1 stop
KLM Logo
7:10 pm - 2:05 pmBOS-SOF
11h 55m1 stop
$756KLM
Find Deal

Everything you should know

Top airlines
Austrian Airlines
Cheapest • from $645 (round-trip)
KLM
Best reviews • 7.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
5 weeks
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 25% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 14% price drop
November
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$637
Typical prices: $612-$786
Multiple Airlines
Thu 12/25Wed 2/25
SOF - BOS • 2 stops
Cheapest one-way
$402
Typical prices: $665-$697
British Airways
Mon 4/27
SOF - BOS • 1 stop
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We hope you love your trip to Boston!
Booking Insights

KAYAK's insights & trends for Sofia to Boston flights

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

How much is a round-trip flight from Sofia to Boston?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Sofia to Boston departing in December.

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

The average price of all round-trip flights from Sofia to Boston clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Sofia to Boston, look for departures on Thursdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Boston, Tuesday is the cheapest day to fly and Friday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Sofia to Boston, 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 Sofia to Boston is January, where tickets cost $595 (return) on average. On the other hand, the most expensive months are August and December, where the average cost of round-trip tickets is $803 and $792 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Sofia to Boston, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Sofia to Boston, you should book around 5 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$402
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Sofia to Boston

When to book flights from Sofia to Boston

Are your dates flexible? Find out the best times to travel from Sofia to Boston 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 Sofia to Boston

  • What is the cheapest flight from Sofia to Boston?

    In the last 3 days, the lowest price for a flight from Sofia to Boston was $402 for a one-way ticket and $637 for a round-trip.

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

    A passport is required to fly from Sofia to Boston.

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

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

  • Which airline alliances offer flights from Sofia to Boston?

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

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

    The two airlines most popular with KAYAK users for flights from Sofia to Boston are KLM and Austrian Airlines. With an average price for the route of $661 and an overall rating of 7.7, KLM is the most popular choice. Austrian Airlines is also a great choice for the route, with an average price of $671 and an overall rating of 7.6.

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

    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 Sofia to Boston.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boston from Sofia 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 Sofia to Boston?

    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 Boston with an airline and back to Sofia with another airline. Booking your flights between Sofia and BOS 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 Sofia to Boston?

    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 Boston from Sofia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Sofia to Boston

 
See real verified KAYAK customer reviews for airlines flying from Sofia to Boston. 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 Sofia to Boston? 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.
7.7
KLMOverall score based on 1406 reviews
7.8Boarding
7.1Entertainment
7.7Comfort
8.4Crew
7.3Food
Airline reviews

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

2.0 MediocreElizabeth, Oct 2025CDG - AMS
Read more KLM reviews

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

The service was great. However the lounge only gets passing grade

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Short flight but an "eager to help" crew made the journey more enjoyable!

Not enough veg food available for passengers. I actually did not get the veg food and was told it was over, and I starved the entire flight duration.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Flight left on time. Boarding was easy. Arrived to EWR 30 mins early. Luggage was deplaned in good time. Overall a very good experience.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

the flight was cancelled and I was rebooked twice, once 26 hours later, then another 24 hours later. In total the flight was delayed for 40 hours. Never again will I use kayak or Turkish Airlines for my travel.

Worst experience with boarding once we left the wheel chair even traveling business we had to wait with all the crowd for the bus to take us to the plane then climb the stairs with our bags When you pay extra for comfort and convenience and you don’t get any is disappointing

Food is very turkish. No regard for other natinalities taste and preference. The entertainment can be improved- it was the same menu on 10/8/25 and 10/25/25. The boarding is the worst in the airline industry- I suggest you ask your staff to and watch how other airlines do it.

The best airline for international travel in terms of value you get in business class (service/cost)

I liked the overall flight experience. However, Turkish officials could do a better job at guiding non-Turkish speakers to their connecting flight gates in such a huge & vast airport.

Very small and cramped aisles and seats. Food was poor but the fresh hot roll and hummus was good. No cans of soda given but they had small bottles of water. Crew was nice and pleasant and kept bathroom clean.

We couldn’t fly to Chicago on our booked flight. The flight was overbooked.

Small seat space for 13 hours flight, they charged for baggage , very bad quality of food,

I was sitting almost in the back, the seats are very tight and there’s no legroom, it’s uncomfortable for a long distance

Absolute worst airline. Charged us $720 to check 4 bags (2 of which were carry-on). Entertainment systems didnt work. And on a 12 hour flight they served 2 meals and never once came around outside of those 2 meals with a beverage or cup of water. Will never fly them again.

The seat space seemed small especially when the person ahead reclined but other than that, very good.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

Give yourself over 2+ hours layover because if flight is slighlty delayed and you miss your connection, Lufthansa will do nothing for you

We would have missed our connection from Munich to Boston but we had a van outside the plan that wisked us to our terminal. Much appreciated and we didn’t even realize that Lufthansa had done this until the announcement on disembarkation. Well organized airline! Will definitely fly Lufthansa again!!!

Everything went well. I will fly with Lufthansa again. And use Kayak whenever I book flights

Bought a seat in a flight that got changed out so ended up paying for a seat I would have had if I hadn't paid.

Food was poor quality and the screens for entertainment didn’t work properly

Food was much better than my outbound flight. On-time. Good service. I had a problem with my entertainment screen, but the attendant fixed it promptly.

I think they overbooked Frankfurt to New York and bumped me off. This changed my return travel I arrived home about 4 hours late. Almost 24 total travel time Totally unacceptable Would not travel with United

United lost my travel information and canceled my original flight. I had a seat assignment but was refused the booking. I had to prove that I went to Germany on United Very concerned about security that no one recorded my passport from Cleveland to NY and NY to Frankfurt I arrived at home at 12:30am on Saturday instead of 8pm I expect a full refund from United Please provide information to assure compensation

Not my definition of first class. No leg room and barely any recline. The food was good. The crew was great. The comfort for the price I paid for London to Cairo was highway robbery. The Wi-Fi didn't work for me either.

There might be more food options for people who can't eat so much starch/sugar/bread/rice. Meat, cheese, walnuts/pecans for snack, maybe jerky or other kinds of meat-based snacks would be better than bread and rice and sweets. I had an extra chardonnay, which was fine. The entertainment was great.

Unfortunately, my flight was cancelled because of some sort of emergency over the Atlantic and had to return to London. While I think British Airways made every effort to mitigate the situation, I must say it was still pretty unpleasant. I do appreciate the fact, however, that British Airways put my safety first…and I think the effort to correct a bad situation was very sincere. But I think the process might be handled better in future.

Crew service was poor and very little difference between premium economy and economy. Disappointed.

My bags never made it on the flight and I now have to wait for them to arrive hopefully tomorrow. You can’t even track your bags in the app to see where they are since they didn’t arrive. You have to file a claim and then wait for them to inform you when you will receive your bag. We were already delayed for an hour due to baggage so I don’t understand how my bag didn’t make the flight.

One of the worst experience given the middle seat even asked for the change no one honored,boarded at the end and overall one of the worst experience

It was good although our flight to the UK was cancelled and rescheduled for two days later. This was after we were already seated on the plane. We missed the first leg of our trip. BA did put us up at a hotel and paid for our meals but we lost our hotel costs in Glasgow.

The crew was very nice and pleasant. We were very reluctant to book our flight with British Airlines because we had bad experience with their flight attendants on the previous trips, they were rude and not helpful.

I am a 25+ years American Airlines member. British Airways is simply above and beyond in every customer satisfaction category.

The seat pads are past there sell by date now and are uncomfotable. Also, with screens in the back of the seat, the seats shouldnt be able to recline as this puts rhe screen in your face.

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