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Flights from Boston to Sofia

Find cheap airlines flights from Boston to Sofia

You can choose from 1 airlines that fly from Boston to Sofia, including KLM, Level has lowest fares on this route.
KLM logo KLM
Airlines are determined based on actual purchased flight tickets from Boston to Sofia according to previous 12 months data from Trip.com.

Find flight deals from Boston to Sofia for the next 3 months. Book one way flights from RUB 22,697 or round trip flights from RUB 71,410.

      • BOS 8:05 PM
        20h 10m
        1 stop
        SOF 11:15 PM
        Boston - Sofia | Mon, Apr 20 | United Airlines
        SOF 6:10 AM
        18h 30m
        1 stop
        BOS 5:40 PM
        Sofia - Boston | Fri, Apr 24 | Lufthansa
        RUB 71,410 RUB 211,210
        66% off
        66% off
        RUB 211,210 RUB 71,410
      • BOS 9:40 PM
        29h 40m
        1 stop
        SOF 10:20 AM
        Boston - Sofia | Mon, Apr 20 | Lufthansa
        SOF 6:10 AM
        18h 30m
        1 stop
        BOS 5:40 PM
        Sofia - Boston | Fri, Apr 24 | Lufthansa
        RUB 73,271 RUB 211,210
        65% off
        65% off
        RUB 211,210 RUB 73,271
      • BOS 5:20 PM
        11h 55m
        1 stop
        SOF 12:15 PM
        Boston - Sofia | Mon, Apr 20 | Austrian Airlines
        SOF 12:55 PM
        11h 45m
        1 stop
        BOS 5:40 PM
        Sofia - Boston | Fri, Apr 24 | Lufthansa
        RUB 75,611 RUB 211,210
        64% off
        64% off
        RUB 211,210 RUB 75,611
      • BOS 4:45 PM
        12h 25m
        1 stop
        SOF 12:10 PM
        Boston - Sofia | Mon, Apr 20 | Delta Air Lines
        SOF 3:40 PM
        31h 57m
        1 stop
        BOS 4:37 PM
        Sofia - Boston | Fri, Apr 24 | Bulgaria Air
        RUB 81,393
        61% off
        RUB 211,210 RUB 81,393
      • BOS 9:45 PM
        33h 15m
        1 stop
        SOF 2:00 PM
        Boston - Sofia | Mon, Apr 20 | Air France
        SOF 7:00 AM
        16h 25m
        1 stop
        BOS 4:25 PM
        Sofia - Boston | Fri, Apr 24 | KLM
        RUB 83,744
        60% off
        RUB 211,210 RUB 83,744
      • BOS 5:20 PM
        11h 55m
        1 stop
        SOF 12:15 PM
        Boston - Sofia | Mon, Apr 20 | Swiss Airlines
        SOF 6:10 AM
        18h 30m
        1 stop
        BOS 5:40 PM
        Sofia - Boston | Fri, Apr 24 | United Airlines
        RUB 106,418
        50% off
        RUB 211,210 RUB 106,418
      • BOS 4:45 PM
        12h 25m
        1 stop
        SOF 12:10 PM
        Boston - Sofia | Mon, Apr 20 | Virgin Atlantic
        SOF 7:00 AM
        19h 35m
        1 stop
        BOS 7:35 PM
        Sofia - Boston | Fri, Apr 24 | Bulgaria Air
        RUB 133,783
        37% off
        RUB 211,210 RUB 133,783
      • BOS 9:50 PM
        15h 25m
        1 stop
        SOF 8:15 PM
        Boston - Sofia | Mon, Apr 20 | Turkish Airlines
        SOF 9:35 AM
        17h 20m
        1 stop
        BOS 7:55 PM
        Sofia - Boston | Fri, Apr 24 | Turkish Airlines
        RUB 141,516
        33% off
        RUB 211,210 RUB 141,516
      • BOS 8:25 PM
        10h 35m
        1 stop
        SOF 2:00 PM
        Boston - Sofia | Mon, Apr 20 | KLM
        SOF 7:00 AM
        18h 30m
        1 stop
        BOS 6:30 PM
        Sofia - Boston | Fri, Apr 24 | Bulgaria Air
        RUB 192,201
        9% off
        RUB 211,210 RUB 192,201
      • BOS 1:00 PM
        17h 25m
        1 stop
        SOF Invalid Date
        Boston - Sofia | Sat, Apr 18 | Normal Airline
        SOF 3:00 PM
        6h
        Nonstop
        BOS 4:00 PM
        Sofia - Boston | Mon, Apr 20 | Normal Airline
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      • BOS 10:50 PM
        19h 45m
        1 stop
        SOF 1:35 AM
        Boston - Sofia | Tue, Apr 21 | Level
        RUB 22,697 RUB 32,583
        30% off
        30% off
        RUB 32,583 RUB 22,697
      • BOS 9:20 PM
        21h 5m
        1 stop
        SOF 1:25 AM
        Boston - Sofia | Wed, May 6 | American Airlines
        RUB 23,856 RUB 32,583
        27% off
        27% off
        RUB 32,583 RUB 23,856
      • BOS 11:10 PM
        20h 45m
        1 stop
        SOF 2:55 AM
        Boston - Sofia | Sat, May 16 | Virgin Atlantic
        RUB 25,070 RUB 32,583
        23% off
        23% off
        RUB 32,583 RUB 25,070
      • BOS 11:10 PM
        20h 45m
        1 stop
        SOF 2:55 AM
        Boston - Sofia | Sun, May 17 | Virgin Atlantic
        RUB 25,549
        22% off
        RUB 32,583 RUB 25,549
      • BOS 11:10 PM
        20h 45m
        1 stop
        SOF 2:55 AM
        Boston - Sofia | Sun, May 17 | Air France
        RUB 25,761
        21% off
        RUB 32,583 RUB 25,761
      • BOS 11:10 PM
        20h 45m
        1 stop
        SOF 2:55 AM
        Boston - Sofia | Sun, May 17 | KLM
        RUB 25,761
        21% off
        RUB 32,583 RUB 25,761
      • BOS 11:10 PM
        20h 45m
        1 stop
        SOF 2:55 AM
        Boston - Sofia | Sun, May 17 | Delta Air Lines
        RUB 25,761
        21% off
        RUB 32,583 RUB 25,761
      • BOS 10:35 PM
        19h 55m
        1 stop
        SOF 1:30 AM
        Boston - Sofia | Sun, May 3 | Jetblue Airways
        RUB 26,229
        20% off
        RUB 32,583 RUB 26,229
      • BOS 9:30 PM
        18h 45m
        1 stop
        SOF 11:15 PM
        Boston - Sofia | Sun, May 3 | Virgin Atlantic
        RUB 29,416
        10% off
        RUB 32,583 RUB 29,416
      • BOS 8:05 PM
        19h 55m
        1 stop
        SOF 11:00 PM
        Boston - Sofia | Tue, Apr 21 | United Airlines
        RUB 29,650
        9% off
        RUB 32,583 RUB 29,650
      • BOS 1:00 PM
        17h 25m
        1 stop
        SOF Invalid Date
        Boston - Sofia | Sat, Apr 18 | Normal Airline
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        Find more flights

Displayed flight fares from Boston to Sofia are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight Info | Boston to Sofia

The distance between Boston and Sofia is approximately 7,279.48 km. Based on Trip.com's data travel demand peaks in July. The off-season for travel is November.

Cheapest one-way flight priceRUB 22,697
Cheapest round-trip ticket priceRUB 71,410
Off-season for travelNovember
Peak season for travelJuly
Flight distance7,279.48 km
Popular airlineKLM Royal Dutch Airlines
Flight statistics for the Boston–Sofia route are based on aggregated booking data from Trip.com over the past 12 months.

Frequently Asked Questions

  • What are the cheapest flights from Boston to Sofia (BOS-SOF)?

    Based on Trip.com data, Level offers one-way fares as low as RUB 22,697 on Cheapest nonstop routes (e.g. BOS to SOF on Tue, Apr 21), while United Airlines offers Cheapest nonstop round-trips from RUB 71,410 departing on Mon, Apr 20 and returning on Fri, Apr 24.
  • At the moment, you can catch a nonstop flight from Boston to Sofia with the following airlines, including: ITA Airways Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Boston to Sofia is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Boston to Sofia, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Apr 21, with one-way flights priced at just RUB 22,697.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Level.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Sofia travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Boston to Sofia is November, when demand for travel is lower.
  • After crunching the numbers on our April flight calendar, it's currently cheapest to fly from Boston to Sofia on April 20, 2026 with SWISS, with prices starting at RUB 34,374.
  • You can land at any one of the following hubs in Sofia, with Boston Logan International Airport to Sofia International Airport (BOS-SOF) is by far the most common option on this route: Sofia International Airport (SOF).
  • The time difference between Sofia and Boston is 7h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.