Cheap flights from Boston to Sofia from $246

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Sofia departing on 8/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Lufthansa Logo
8:40 pm - 6:20 pmBOS-SOF
14h 40m1 stop
Lufthansa Logo
2:00 pm - 6:35 pmSOF-BOS
11h 35m1 stop
$441Lufthansa
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Fri, Jan 16 - Fri, Jan 30
 Logo
8:40 pm - 6:20 pmBOS-SOF
14h 40m1 stop
 Logo
7:05 pm - 6:35 pmSOF-BOS
30h 30m1 stop
Sun, Jan 18 - Sun, Feb 1
United Airlines Logo
12:10 pm - 12:00 pmBOS-SOF
16h 50m2 stops
United Airlines Logo
6:00 am - 5:40 pmSOF-BOS
18h 40m1 stop
$447United Airlines
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Mon, Oct 6 - Tue, Oct 14
United Airlines Logo
5:10 pm - 11:40 amBOS-SOF
11h 30m1 stop
United Airlines Logo
12:45 pm - 5:40 pmSOF-BOS
11h 55m1 stop
$448United Airlines
Find Deal
Wed, Oct 1 - Thu, Oct 9
Air Canada Logo
6:40 pm - 1:00 pmBOS-SOF
35h 20m2 stops
Air Canada Logo
6:20 am - 9:25 pmSOF-BOS
22h 05m2 stops
$449Air Canada
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Sun, Aug 31 - Tue, Sep 30
SWISS Logo
9:40 pm - 10:05 amBOS-SOF
29h 25m1 stop
SWISS Logo
10:50 am - 3:25 pmSOF-BOS
11h 35m1 stop
$453SWISS
Find Deal
Thu, Oct 9 - Thu, Oct 23
Austrian Airlines Logo
12:10 pm - 11:55 pmBOS-SOF
28h 45m2 stops
Austrian Airlines Logo
8:00 am - 1:50 pmSOF-BOS
12h 50m1 stop
$457Austrian Airlines
Find Deal
Wed, Oct 1 - Wed, Oct 8
SWISS Logo
9:40 pm - 12:00 pmBOS-SOF
31h 20m2 stops
SWISS Logo
3:30 pm - 3:25 pmSOF-BOS
30h 55m1 stop
$463SWISS
Find Deal
Sun, Oct 5 - Mon, Oct 13
Austrian Airlines Logo
12:10 pm - 6:10 pmBOS-SOF
23h 00m2 stops
Austrian Airlines Logo
6:55 pm - 5:54 pmSOF-BOS
29h 59m2 stops
$468Austrian Airlines
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Wed, Oct 1 - Tue, Oct 14
Air Canada Logo
6:00 am - 6:40 pmBOS-SOF
29h 40m2 stops
Air Canada Logo
1:50 pm - 9:30 amSOF-BOS
50h 40m2 stops
$470Air Canada
Find Deal
Sun, Oct 5 - Mon, Oct 13

United Airlines flights from Boston to Sofia

Our best United Airlines deals on Boston to Sofia flight tickets
United Airlines
Oct 6
BOS12:10 pmBoston Logan Intl
16h 50m
2 stops
SOF12:00 pmSofia
Oct 14
SOF6:00 amSofia
18h 40m
1 stop
BOS5:40 pmBoston Logan Intl
United Airlines
Oct 1
BOS5:10 pmBoston Logan Intl
11h 30m
1 stop
SOF11:40 amSofia
Oct 9
SOF12:45 pmSofia
11h 55m
1 stop
BOS5:40 pmBoston Logan Intl
United Airlines
Jan 10
BOS7:55 pmBoston Logan Intl
39h 25m
2 stops
SOF6:20 pmSofia
Jan 31
SOF2:00 pmSofia
11h 35m
1 stop
BOS6:35 pmBoston Logan Intl

Austrian Airlines flights from Boston to Sofia

Our best Austrian Airlines deals on Boston to Sofia flight tickets
Austrian Airlines
Oct 1
BOS12:10 pmBoston Logan Intl
28h 45m
2 stops
SOF11:55 pmSofia
Oct 8
SOF8:00 amSofia
12h 50m
1 stop
BOS1:50 pmBoston Logan Intl
Austrian Airlines
Oct 1
BOS12:10 pmBoston Logan Intl
23h 00m
2 stops
SOF6:10 pmSofia
Oct 14
SOF6:55 pmSofia
29h 59m
2 stops
BOS5:54 pmBoston Logan Intl

momondo Fare Finder

 
Customize your flight search to find flights from Boston to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 18, 2025.
Use the filters below to find and compare flights from Boston to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 1/16

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Fri 1/30

2:00 pm-6:35 pm

1 stop11h 35m

$441

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 1/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

Sun 2/1

7:05 pm-6:35 pm

1 stop30h 30m

$445

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 10/6

12:10 pm-12:00 pm

2 stops16h 50m

Sofia

Tue 10/14

6:00 am-5:40 pm

1 stop18h 40m

$447

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Thu 10/9

12:45 pm-5:40 pm

1 stop11h 55m

$448

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 8/31

6:40 pm-1:00 pm

2 stops35h 20m

Sofia

Tue 9/30

6:20 am-9:25 pm

2 stops22h 05m

$449

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 10/9

9:40 pm-10:05 am

1 stop29h 25m

Sofia

Thu 10/23

10:50 am-3:25 pm

1 stop11h 35m

$453

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/1

12:10 pm-11:55 pm

2 stops28h 45m

Sofia

Wed 10/8

8:00 am-1:50 pm

1 stop12h 50m

$457

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/5

9:40 pm-12:00 pm

2 stops31h 20m

Sofia

Mon 10/13

3:30 pm-3:25 pm

1 stop30h 55m

$463

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/1

12:10 pm-6:10 pm

2 stops23h 00m

Sofia

Tue 10/14

6:55 pm-5:54 pm

2 stops29h 59m

$468

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/5

6:00 am-6:40 pm

2 stops29h 40m

Sofia

Mon 10/13

1:50 pm-9:30 am

2 stops50h 40m

$470

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Sofia from

How to get the cheapest flight ticket from Boston to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Boston and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Boston is in October. Flight prices, which tend to average around $585, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from Boston during November instead. Flights to Sofia in November, while not as cheap as those in October, still average around $666.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Tuesday is the cheapest day to fly to Sofia from Boston. The lowest ticket price found for a Tuesday departure recently was $843. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Boston to Sofia on a Friday will generally be more expensive and average around $997. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the evening is the cheapest time of day to fly from Boston to Sofia when you can find flight prices for as low as $816. Flying to Sofia in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,022 per ticket.

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

You are more likely to see cheaper flights to Sofia from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $810 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Boston for as low as $661 on momondo.

How have Boston to Sofia flight prices changed over time?

As of August 2025, prices for Boston to Sofia flights are approximately 6% cheaper when compared to flights at the same time last year.

When to book flights from Boston to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to Sofia (BOS to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Sofia

Best Price Found

$246

Fastest flight time

11h 30m

Direct flights

None

Airports in Sofia

1 airport
The best one-way flight to Sofia from Boston in the past 72 hours is $246. The best round-trip flight deal from Boston to Sofia found on momondo in the last 72 hours is $441.
The fastest flight from Boston to Sofia takes 11h 30m
There are no direct flights from Boston to Sofia. Popular non-direct route for this connection is Boston Logan Intl Airport - Sofia Airport.
There is 1 airport near Sofia: Sofia (SOF)
  • How far is Boston Logan Intl to Sofia by plane?

    Boston Logan Intl and Sofia are 4519.3 mi apart from one another. In terms of flight time, this usually takes a little over 11h 30m.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Sofia Airport?

    Prices for flights from Boston Logan Intl Airport to Sofia Airport were last updated today.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to Sofia Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Boston to Sofia?

Best airlines flying from Boston to Sofia

Compare and see reviews for airlines that fly from Boston to Sofia with momondo
Airline
Rating
Free Cancellation
Price
Air FrancePriceFrom $416Free CancellationRating
7.4
1,468 reviews
Search Air France flights
KLMPriceFrom $432Free CancellationRating
7.8
1,385 reviews
Search KLM flights
SWISSPriceFrom $437Free CancellationRating
7.6
1,699 reviews
Search SWISS flights
United AirlinesPriceFrom $505Free CancellationRating
7.4
8,925 reviews
Search United Airlines flights
ITA AirwaysPriceFrom $505Free CancellationRating
6.7
1,019 reviews
Search ITA Airways flights
Turkish AirlinesPriceFrom $507Free CancellationRating
7.3
3,945 reviews
Search Turkish Airlines flights
British AirwaysPriceFrom $510Free CancellationRating
6.6
7,277 reviews
Search British Airways flights
LufthansaPriceFrom $570Free CancellationRating
6.8
7,330 reviews
Search Lufthansa flights
Austrian AirlinesPriceFrom $595Free CancellationRating
7.6
829 reviews
Search Austrian Airlines flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Sofia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Boston to Sofia. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Boston to Sofia with flexible booking policies on momondo?

Flights from Boston to Sofia with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Boston to Sofia?

Once you have performed a search for Boston to Sofia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Boston to Sofia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Sofia from Boston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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1 adult
Sat 8/23
Sat 8/30

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