$298 Flights from Denver International (DEN) to Sofia (SOF)

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Flight deals from Denver International Airport to Sofia Airport

Looking for a cheap last-minute deal or the best round-trip flight from Denver International Airport to Sofia Airport? If you want to travel next month, round-trip fares start from $647. Find the lowest prices on one-way and round-trip tickets right here.

Find the cheapest month to fly from Denver International to Sofia

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver International to Sofia flights are currently cheapest in May.

Denver International to Sofia: Alternative routes

Compare routes from Denver International to Sofia below. You may find an airport to fly into that's cheaper, faster, or easier than Sofia.

Denver to Sofia: Flight information

The things to know before you go.
Cheapest flight found$298
Cheapest month to flyMay

Finding cheap flights from Denver International to Sofia: Frequently asked questions

The best price we found for a round-trip flight from Denver International to Sofia is $567. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Denver International to Sofia. But we found flights with one or more stops from $567.
There are no flights flying from Denver International to Sofia, as of March 2026.
The cheapest month to fly from Denver International to Sofia is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Denver International Airport to Sofia Airport on Tuesday, September 1, 2026.
No airlines currently offer direct flights between Denver International Airport and Sofia Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Sofia but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Sofia is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Air Canada offers the cheapest flight tickets to Sofia.

Traveling from Denver International Airport (DEN) to Sofia Airport (SOF): what you need to know

  • Sofia is eight hours ahead of Denver and is in the UTC+2 timezone.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are tried-and-true travel tips. Make sure you're at the airport on time to catch your DEN to SOF flight.

  • Be prepared for longer queues during popular months like July. Arriving up to four hours in advance for international flights and two hours for a domestic departure is a wise move.

  • Consider adding a stopover when booking your ticket from Denver International Airport to Sofia Airport. Just uncheck 'Direct flights only' to break up your journey, or even explore someplace new along the way. Check out these options between DEN and SOF:

    • Franz Josef Strauss Airport

    • London Heathrow Airport

    • Frankfurt Airport

How to find the cheapest flights from Denver International Airport (DEN) to Sofia Airport (SOF)

  • The cheapest price we've seen for a one-way Denver International Airport to Sofia Airport flight is $298. A round-trip fare right now is $567. Depending on the availability and when you book, these fares may change.

  • Don't leave everything to the last minute. You're more likely to find cheap tickets from DEN to SOF if you book in advance. Airlines often offer some fantastic early bird discounts.

  • Getting cheap flights from Denver International Airport to Sofia Airport is more likely if you're flexible with your travel plans. Use the 'Whole month' search tool to see the lowest prices across the month and score a great deal.

  • You won't have to check every day to see if fares have gone down when you set up a Price Alert. We'll send you an update the moment a special offer becomes available on cheap flights from DEN to SOF.

  • Tailor your trip with filters. Select your departure and arrival times, total journey duration and airlines. You can also sort your results by 'Best,' 'Fastest' or 'Cheapest' flights from Denver International Airport to Sofia Airport.

Handy information about Denver International Airport (DEN)

  • You'll find DEN at 8500 Pena Boulevard.

  • 80.23% of flights departing from Denver International Airport reach their destination on time. With its solid on-time performance, delays are unlikely when jetting out of DEN.

  • Central Denver to Denver International Airport is approximately 25 miles. Depending on traffic, it'll take you about 35 minutes to get there if you're ride-sharing, catching a cab or driving.

  • The journey on public transport takes about 1 hour 30 minutes.

  • Get your flight from Denver International Airport to Sofia Airport off to a relaxed start. Just a quick drive from DEN, book a night at Baymont by Wyndham Denver International Airport and be well-rested for the journey ahead.

Arriving at Sofia Airport (SOF)

  • If you're landing on a late Denver International Airport to Sofia Airport flight, few things top the convenience of being near the terminal. Pick up your bags from the carousel and then be showered and resting soon after at one of these hotels near SOF:

  • Follow your own route with a Sofia Airport rental car. Book your wheels from MEX, Surprice or NU Car Rentals and find adventure across Sofia and beyond.

  • Lock in the best possible rate by booking your vehicle from Sofia Airport around one week before your travel date.

Getting from Sofia Airport (SOF) to central Sofia

  • From Sofia Airport, Sofia is approximately 7 miles away. It takes around 15 minutes to reach the center by car.

  • It takes roughly 35 minutes to get there using public transport.

When to fly to Sofia Airport (SOF)

  • It's time to work out your trip dates for your flight from Denver International Airport to Sofia Airport. August is the busiest month to visit Sofia. If you want a more laid-back vibe, go in April.

  • When booking your flight from Denver International Airport to Sofia Airport, think about the type of weather you enjoy. August is the warmest month in Sofia, with the temperature ranging from 57ºF to 86ºF.

  • For cooler conditions, search for a cheap ticket from DEN to SOF in January. Average temperatures are between 12ºF and 45ºF then.

Explore more of Bulgaria

  • Sofia is always a good idea, but there are so many other corners of Bulgaria just waiting to be discovered. About 80 miles south-east of Sofia, a trip to Plovdiv will keep your itinerary packed. Start with attractions like Plovdiv Old Town, Plovdiv Roman Theatre and Archaelogical Complex Nebet Tepe.

  • Around 240 miles east of Sofia, Varna is another favorite stop in Bulgaria. Experience the best of this destination with a visit to Park Asparuhovo - Asparuhovo sea garden, Dormition of theotokos Cathedral and Sunset viewpoint (място за гледане на Залеза).

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.