SOF - BOS

$412 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

KAYAK searches hundreds of travel sites at once for deals on flights to Boston

 
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.
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

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

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

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

Everything you should know

Cheapest round-trip
$655
Overall average: $611
Multiple Airlines
Thu 1/22Wed 2/4
SOF - BOS • 2 stops
Cheapest one-way
$412
Typical prices: $665-$697
Multiple Airlines
Mon 4/27
SOF - BOS • 1 stop
Top airlines
ITA Airways
Cheapest • from $688 (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 20% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 12% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Boston!
Flight Deals
Booking Insights
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, Jan 22 - Wed, Feb 4
Multiple Airlines Logo
7:55 pm - 2:35 pm
SOF
-
BOS
25h 40m2 stops
Multiple Airlines Logo
6:05 pm - 10:50 pm
BOS
-
SOF
21h 45m2 stops
$655Multiple Airlines
Sun, Feb 1 - Sun, Feb 8
Multiple Airlines Logo
5:25 pm - 2:35 pm
SOF
-
BOS
28h 10m2 stops
Multiple Airlines Logo
6:05 pm - 12:40 am
BOS
-
SOF
23h 35m3 stops
$658Multiple Airlines
Tue, Jun 16 - Sun, Aug 23
Multiple Airlines Logo
6:30 am - 9:05 pm
SOF
-
BOS
21h 35m2 stops
Multiple Airlines Logo
11:50 pm - 1:30 am
BOS
-
SOF
18h 40m1 stop
$660Multiple Airlines
Thu, Jan 22 - Wed, Feb 4
Multiple Airlines Logo
2:30 pm - 8:10 pm
SOF
-
BOS
36h 40m3 stops
Multiple Airlines Logo
7:50 pm - 2:55 am
BOS
-
SOF
24h 05m2 stops
$662Multiple Airlines
Sun, Feb 1 - Sun, Feb 8
Multiple Airlines Logo
5:25 pm - 8:55 pm
SOF
-
BOS
34h 30m1 stop
Multiple Airlines Logo
9:15 pm - 3:40 pm
BOS
-
SOF
35h 25m2 stops
$666Multiple Airlines
Thu, Jan 22 - Wed, Feb 4
Lufthansa Logo
6:00 am - 1:35 pm
SOF
-
BOS
14h 35m1 stop
Lufthansa Logo
8:40 pm - 6:20 pm
BOS
-
SOF
14h 40m1 stop
$671Lufthansa
Mon, Jun 15 - Tue, Aug 25
Multiple Airlines Logo
6:55 pm - 9:05 pm
SOF
-
BOS
33h 10m2 stops
Multiple Airlines Logo
11:00 pm - 1:30 am
BOS
-
SOF
19h 30m1 stop
$672Multiple Airlines
Mon, Jun 15 - Tue, Aug 25
Multiple Airlines Logo
6:50 pm - 9:05 pm
SOF
-
BOS
33h 15m1 stop
Multiple Airlines Logo
11:00 pm - 1:30 am
BOS
-
SOF
19h 30m1 stop
$673Multiple Airlines
Thu, Jan 22 - Wed, Feb 4
Lufthansa Logo
6:00 am - 1:35 pm
SOF
-
BOS
14h 35m1 stop
Lufthansa Logo
4:15 pm - 1:15 pm
BOS
-
SOF
14h 00m2 stops
$680Lufthansa
Tue, Jan 27 - Wed, Apr 8
Multiple Airlines Logo
4:45 pm - 4:19 pm
SOF
-
BOS
54h 34m2 stops
Multiple Airlines Logo
10:50 pm - 1:30 am
BOS
-
SOF
19h 40m1 stop
$681Multiple Airlines
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.

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 $611 (return) on average. On the other hand, the most expensive months are December and August, where the average cost of round-trip tickets is $821 and $807 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 20% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Good to know

Low seasonNovember
Cheapest flight$412
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 5% 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 $412 for a one-way ticket and $655 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?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Sofia and Boston, with SkyTeam 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 $667 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 1428 reviews
7.8Boarding
7.1Entertainment
8.4Crew
7.2Food
7.6Comfort
Airline reviews

Terrible last row seats many seats available but no offer to move to better seat

2.0 MediocreAnonymous, Dec 2025
AMS - BUD
Read more KLM reviews

Terrible last row seats many seats available but no offer to move to better seat

Delay on my previous leg, had to run to catch my flight. But that happens. Overall ok.

Delay and had to run between flight to get my connection due to this delay but besides that the overall experience was ok. I arrived with just an hour of delay.

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!

Safe and stable made me sleepy and I slept and dreamt 😂😂😂😂

Food was really mediocre for premium economy in comparison to other airlines… the crew was nowhere to be found… 14 hour flight…

I don’t like that an equipment change caused my seat to change from 23A to 44A. The boarding was also delayed. The crew were excellent, however and very attentive. The food was not bad.

Worst airlines either. First leg was delayed because of crew not available. My connection was missed so they booked me automatically the next day! But, impossible to get anyone on site, web site does not let me access my reservation anymore, confirmed by useless agents over the phone. My 2-leg trip with part in business class arriving at 4:10pm ends up in an awful 3-leg arriving at 9pm the next day with no way to even choose the seats and of course at the very end of the plane. I can understand problems arrive but the way Air France handle it is just unacceptable. You are on your own. Apparently getting you to your destination is the only thing they consider their duty. The customer experience and fatigue is none of their concern. And I have a status with them. I will reconsider my priorities when flying with Air France and encourage everyone to do the same.

3 hour delay but out of their control. App said I get vouchers but when I applied for them, they were nowhere to be found in my account

I bought business class tickets but the seats are exactly like economy with no comfort seats nor an empty seat next to me provided. Very poor, low quality airline.

I don't understand the concept of paying to get your personal luggage onboard and then asked to check it in.... either sell the space or don't, its a hassle to carry those all through the airport just to make a check in at the last minute.

The food was great and the service and attitude was amazing!!

It was a great experience. The only thing I would have changed was that the bathrooms were never cleaned and they got very dirty.

Old airplanes small seats expensive tickets, not as expected overall and not comfortable according to the price

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

Movie selection is good. Crew did not understand mileage program and were no help. Sick later. Food?

Staff on board was excellent. Positive upbeat helpful- like it used to be.

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

For an expensive flight to another country, United has a lot of nerve serving pretzels and no meals (unless, of course, you want to buy something to eat). Unacceptable.

The food is terrible. The same pasta or chicken with bad taste and presentation

United have really come back. Airport and boarding process is clear and good, app and information also very good

The Sears in the 800s are not too good perfect Airbus why cant the new 737 fix that

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

It was probably one of the worst flights I’ve been on. The restrooms were never cleaned or stocked. The food was very subpar, and i usually enjoy airline food, so I was disappointed. It was just all around a bad experience. The only saving grace was the flight attendants.

Seats too much and for the price we paid eve thought economy we still had to pay $169 to check a ba that’s ridiculous and also my daughter needed water so she can take her medicine we push the boton for the attendant to get us water they never came we push it 3 times no one came and ask what we needed . Am not happy with the service at all I will not fly with TK anymore

Boarding experience was a mess- both to and from Istanbul airport. No one knew anything. They asked everyone to line up according to their sit numbers- it was unbelievable. Business class had a separate line, but it was hard to find- I had to go through all that mess before finding it. Would not recommend

Excellent food and service on my international flight. Most notable is the food provided by Turkish even for coach passengers is very good.

They can my date of travel and let me standard in Istanbul for three days stop over and only pay for one day in a hotel with only one breakfast for three days.

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.

Booked seats (paid extra) online and found they didn’t exist on the flight. We were then separated from the rest of our party. Given seats in the very back of the plane. We will not fly Discover or Lufthansa again. We will not book flights or travel through Kayak again!

Had a few open seats and could use it for a great rest ful journey

It was very good. Service was friendly and efficient, and food was good.

Airline food is airline food, but the plane was wonderful and the seating comfort outstanding. One of my best flights in quite a while.

Crew was outstanding, helpful and friendly. Food is deteriorating. The snack at the end of the flight was not good, a greasy moosh of toast cheese snd other unidentifiable ingredients. Coming from Germany a pretzl with butter would have been better. Entertainment had a great selection.

Smooth flight with enough time for connection. Ran out of meal options. In-flight and gate staff were friendly and helpful. Good service overall.

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 you need to know for your flight from Sofia to Boston

Information on your arrival and departure airports