$149 Cheap Flights from Reykjavik (KEF) to Sofia (SOF)

View $149 flight on Tue, Aug 26, 2025Opens in a new window

Popular airlines from Reykjavik–Keflavik Intl. Airport (KEF) to Sofia Airport (SOF)

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Cheap Flights from Reykjavik to Sofia (KEF-SOF)

Prices were available within the past 7 days and start at $149 for one-way flights and $236 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Austrian Airlines
Sat, Oct 11 - Sun, Oct 19
KEF
Reykjavik
SOF
Sofia
$236 Roundtrip, found 2 days ago
$236
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Sat, Oct 11 from Reykjavik to Sofia, returning Sun, Oct 19, priced at $236 found 2 days ago
Austrian Airlines
Sat, Oct 11 - Sun, Oct 19
KEF
Reykjavik
SOF
Sofia
$236 Roundtrip, found 2 days ago
$236
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Sat, Oct 11 from Reykjavik to Sofia, returning Sun, Oct 19, priced at $236 found 2 days ago
Austrian Airlines
Sat, Oct 11 - Thu, Oct 16
KEF
Reykjavik
SOF
Sofia
$247 Roundtrip, found 2 days ago
$247
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Sat, Oct 11 from Reykjavik to Sofia, returning Thu, Oct 16, priced at $247 found 2 days ago
Austrian Airlines
Sat, Oct 11 - Fri, Oct 17
KEF
Reykjavik
SOF
Sofia
$257 Roundtrip, found 2 days ago
$257
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Sat, Oct 11 from Reykjavik to Sofia, returning Fri, Oct 17, priced at $257 found 2 days ago
Lufthansa
Thu, Sep 18 - Tue, Sep 30
KEF
Reykjavik
SOF
Sofia
$259 Roundtrip, found 16 hours ago
$259
Roundtrip
found 16 hours ago
Select Lufthansa flight, departing Thu, Sep 18 from Reykjavik to Sofia, returning Tue, Sep 30, priced at $259 found 16 hours ago
Austrian Airlines
Sat, Oct 11 - Sun, Oct 19
KEF
Reykjavik
SOF
Sofia
$260 Roundtrip, found 2 days ago
$260
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Sat, Oct 11 from Reykjavik to Sofia, returning Sun, Oct 19, priced at $260 found 2 days ago
Lufthansa
Thu, Sep 25 - Sat, Oct 11
KEF
Reykjavik
SOF
Sofia
$269 Roundtrip, found 16 hours ago
$269
Roundtrip
found 16 hours ago
Select Lufthansa flight, departing Thu, Sep 25 from Reykjavik to Sofia, returning Sat, Oct 11, priced at $269 found 16 hours ago
Swiss International Air Lines
Tue, Sep 30 - Tue, Oct 14
KEF
Reykjavik
SOF
Sofia
$293 Roundtrip, found 16 hours ago
$293
Roundtrip
found 16 hours ago
Select Swiss International Air Lines flight, departing Tue, Sep 30 from Reykjavik to Sofia, returning Tue, Oct 14, priced at $293 found 16 hours ago
LOT-Polish Airlines
Wed, Oct 29 - Tue, Nov 11
KEF
Reykjavik
SOF
Sofia
$306 Roundtrip, found 16 hours ago
$306
Roundtrip
found 16 hours ago
Select LOT-Polish Airlines flight, departing Wed, Oct 29 from Reykjavik to Sofia, returning Tue, Nov 11, priced at $306 found 16 hours ago
Norwegian Air Shuttle
Tue, Aug 26 - Sun, Sep 14
KEF
Reykjavik
SOF
Sofia
$384 Roundtrip, found 2 days ago
$384
Roundtrip
found 2 days ago
Select Norwegian Air Shuttle flight, departing Tue, Aug 26 from Reykjavik to Sofia, returning Sun, Sep 14, priced at $384 found 2 days ago

Alternative airports near Sofia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sofia Airport SOF. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $735
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $735
Flights from Reykjavik (KEF) to Sofia (SOF)
Origin airport
Keflavik Intl.
Destination airport
Sofia
Airlines serving
Austrian Airlines, Iberia, LOT-Polish Airlines, Lufthansa, Norwegian Air Shuttle, Scandinavian Airlines, Swiss International Air Lines, Turkish Airlines
Roundtrip price
$235
Distance
2319 mi

Reykjavik to Sofia Flights

The cheapest times to fly from Reykjavik 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 Reykjavik to Sofia are during the month of October. You can find some of the cheapest flights from Reykjavik to Sofia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Reykjavik to Sofia

Sunday is one of the best days to book for cheap flights from Reykjavik 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 Reykjavik 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 Reykjavik to Sofia in 2025. You can also book with separate airlines for your outbound and return journeys, from $149 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 Reykjavik 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 Reykjavik 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.

 

Frequently asked questions

How much does a flight from Keflavik Intl. Airport (KEF) to Sofia Airport (SOF) cost?
Discover the latest flight deals from KEF to SOF by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from KEF to SOF?
The cheapest flights from KEF to SOF are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from KEF to SOF?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from KEF to SOF. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Keflavik Intl. Airport (KEF) to Sofia Airport (SOF)?
Nonstop flights from Keflavik Intl. Airport (KEF) to Sofia Airport (SOF) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from KEF to SOF?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Keflavik Intl. Airport (KEF) to Sofia Airport (SOF)?
To arrive at Sofia Airport (SOF) without delays, select a flight that leaves Keflavik Intl. Airport (KEF) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Keflavik Intl. Airport (KEF) to Sofia Airport (SOF) last-minute?
Last-minute fares from KEF to SOF are typically more expensive. To lock in the best prices, start searching for flights early. That being said, if you're flexible with your travel plans, it's possible to find a cheap fare right before your journey.
Is it cheaper to book a KEF to SOF flight and hotel package?
You'll typically save money by booking a KEF to SOF flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your preferred accommodations and flights, you can add extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Keflavik Intl. Airport (KEF) to Sofia Airport (SOF)?
If you booked your KEF to SOF flight within the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for further details.

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*Available to One Key members.