$373 Cheap Flights from Knoxville (TYS) to Sofia (SOF)

View $373 flight on Wed, Sep 23, 2026Opens in a new window

Popular airlines from McGhee Tyson Airport (TYS) to Sofia Airport (SOF)

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Cheap Flights from Knoxville to Sofia (TYS-SOF)

Prices were available within the past 7 days and start at $373 for one-way flights and $822 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$822 Roundtrip, found 5 days ago
$822
Roundtrip
found 5 days ago
Select British Airways flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $822 found 5 days ago
Lufthansa
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$840 Roundtrip, found 5 days ago
$840
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $840 found 5 days ago
Air France
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$847 Roundtrip, found 5 days ago
$847
Roundtrip
found 5 days ago
Select Air France flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $847 found 5 days ago
Air France
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$875 Roundtrip, found 5 days ago
$875
Roundtrip
found 5 days ago
Select Air France flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $875 found 5 days ago
Air France
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$892 Roundtrip, found 5 days ago
$892
Roundtrip
found 5 days ago
Select Air France flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $892 found 5 days ago
United
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$893 Roundtrip, found 5 days ago
$893
Roundtrip
found 5 days ago
Select United flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $893 found 5 days ago
Delta
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$902 Roundtrip, found 5 days ago
$902
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $902 found 5 days ago
Lufthansa
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$906 Roundtrip, found 5 days ago
$906
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $906 found 5 days ago
United
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$913 Roundtrip, found 5 days ago
$913
Roundtrip
found 5 days ago
Select United flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $913 found 5 days ago
Air France
Wed, Sep 23 - Wed, Sep 30
TYS
Knoxville
SOF
Sofia
$927 Roundtrip, found 5 days ago
$927
Roundtrip
found 5 days ago
Select Air France flight, departing Wed, Sep 23 from Knoxville to Sofia, returning Wed, Sep 30, priced at $927 found 5 days ago

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Frequently asked questions

How much does a flight from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) cost?
You can find cheap one-way flights from $373 and cheap return flights from $822 Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) with Expedia. Roundtrip flights usually range from $964 to $5104. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
The cheapest month to fly from TYS to SOF is September when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
Enter TYS to SOF and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
KLM is one of the cheapest airlines offering connecting flights from McGhee Tyson (TYS) to Sofia (SOF) with a layover in Hartsfield-Jackson Atlanta Intl. (ATL), starting from around $1093 for a round-trip ticket. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
To find a cheap flight from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from TYS to SOF. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
You'll usually find the most flights from McGhee Tyson (TYS) to (SOF) on a Wednesday, with around 42 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Delta, American Airlines, and United.
What are the most popular departure times for flights from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
The most popular departure times for flights from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) are in the early afternoon, from 12pm to 3pm. About 29% of passengers choose this time window. Many major carriers, including United Airlines and American Airlines, operate flights during this period. This timing is favored as it allows you to travel after a leisurely morning.
How long does it take to fly from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
Flying from TYS to SOF with a connection usually takes about 19 hours, traveling roughly 5,347 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
Select the "Business class" and "First class" filters when looking for TYS to SOF flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) flight with Expedia?
It's easy to earn miles on a Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) at the last minute?
Typically, booking a last minute flight from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) flight and hotel package?
Securing a Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) Sofia Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF)?
If you booked your Knoxville, TN (TYS-McGhee Tyson) to Sofia (SOF) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
McGhee Tyson
Destination airport
Sofia
Roundtrip price
$822
Distance
5346 mi

Book with confidence

Knoxville to Sofia Flights

The cheapest times to fly from Knoxville to Sofia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Knoxville to Sofia are during the month of September. You can find some of the cheapest flights from Knoxville to Sofia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Knoxville to Sofia

Sunday is one of the best days to book for cheap flights from Knoxville to Sofia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Knoxville to Sofia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Knoxville to Sofia in 2026. You can also book with separate airlines for your outbound and return journeys, from $373 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Knoxville to Sofia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Knoxville to Sofia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Knoxville to Sofia Flights

*Flight schedules are subject to change.

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