BOI - SOF

$643 Find Cheap Flights from Boise to Sofia

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to Sofia departing on 3/27. 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 Sofia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boise to Sofia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boise to Sofia, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$643
United Airlines
Fri 3/27Tue 3/31
BOI - SOF • 2 stops
Cheapest one-way
$3,378
Multiple Airlines
Sat 11/15
BOI - SOF • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sofia!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Boise to Sofia (BOI-SOF)

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

Recent round-trip flight deals from Boise to Sofia

Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
10:40 am - 10:45 pmBOI-SOF
28h 05m2 stops
United Airlines Logo
6:10 am - 11:06 pmSOF-BOI
25h 56m2 stops
$643United Airlines
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Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
10:40 am - 10:45 pmBOI-SOF
28h 05m2 stops
United Airlines Logo
6:10 am - 11:59 pmSOF-BOI
26h 49m2 stops
$733United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
United Airlines Logo
10:40 am - 10:45 pmBOI-SOF
28h 05m2 stops
United Airlines Logo
6:10 am - 9:15 pmSOF-BOI
24h 05m2 stops
$893United Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Boise to Sofia flights

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

Which airlines fly non-stop between Boise and Sofia?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Boise to Sofia.

There is just one airline that flies from Boise to Sofia direct and that is United Airlines. The best round-trip deal found from United Airlines for the route is $645.

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Good to know

Low seasonSeptember
Cheapest flight$643
Best time to beat the crowds with an average 56% drop in price.
Most popular time to fly and prices are also 45% lower on average.
Flight from Boise to Sofia

When to book flights from Boise to Sofia

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

  • What is the cheapest flight from Boise to Sofia?

    In the last 3 days, the lowest price for a flight from Boise to Sofia was $3,378 for a one-way ticket and $643 for a round-trip.

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

    A passport is required to fly from Boise to Sofia.

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

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

  • Which airline alliances offer flights from Boise to Sofia?

    Star Alliance is the only airline alliance operating flights between Boise and Sofia.

  • How does KAYAK find such low prices on flights from Boise 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 Boise to Sofia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Boise 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 Boise 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 Boise with another airline. Booking your flights between Boise 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 Boise 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 Boise up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Boise to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Boise 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 Boise 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.
7.4
United AirlinesOverall score based on 9007 reviews
8.1Crew
7.1Entertainment
7.7Boarding
7.3Comfort
6.6Food
Airline reviews

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

10.0 ExcellentKaren, Nov 2025EWR - LAX
Read more United Airlines reviews

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

7 hours delayed due to operational issues on United’s end. Basically laziness.

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

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.

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.

Everything you need to know for your flight from Boise to Sofia

Information on your arrival and departure airports

Boise (BOI)
Sofia (SOF)