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Cheap Flights from Denver International (DEN) to Sofia (SOF)

Compare Denver International to Sofia flight deals

Find the cheapest month or even day of the year to fly to Sofia

Book the best Sofia fare with no extra fees

Flight deals from Denver International to Sofia

Looking for a cheap last-minute deal or the best return flight from Denver International Airport to Sofia Airport? If you want to travel next month, return fares start from £705. Find the lowest prices on one-way and return tickets right here.
Sofia.£193 per passenger.Departing Sun, 30 Aug.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sun, 30 Aug, arriving in Sofia.Price includes taxes and charges.From £193, select.
Sofia.£244 per passenger.Departing Thu, 8 Oct.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Thu, 8 Oct, arriving in Sofia.Price includes taxes and charges.From £244, select.
Sofia.£250 per passenger.Departing Tue, 28 Jul.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Tue, 28 Jul, arriving in Sofia.Price includes taxes and charges.From £250, select.
Sofia.£250 per passenger.Departing Fri, 25 Sep.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Fri, 25 Sep, arriving in Sofia.Price includes taxes and charges.From £250, select.
Sofia.£289 per passenger.Departing Sat, 12 Dec.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Denver International on Sat, 12 Dec, arriving in Sofia.Price includes taxes and charges.From £289, select.
Sofia.£632 per passenger.Departing Wed, 24 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 24 Jun, arriving in Sofia.Price includes taxes and charges.From £632, select.

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 August.
Jun
from £632
Jul
from £250
Aug
from £193
Sep
from £250
Oct
from £244
Nov
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Dec
from £289
Jan
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Feb
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Mar
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Apr
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May
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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.

Sofia

4 miles from central Sofia
ClosestCheapest
from £193
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Denver to Sofia: Flight information

The things to know before you go.
Cheapest flight found£193
Cheapest month to flyAugust

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

The best price we found for a return flight from Denver International to Sofia is £553. 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 £553.
As of June 2026, there are no flights flying from Denver International to Sofia.
The cheapest month to fly from Denver International to Sofia is usually March.
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, 2 March 2027.
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, United offers the cheapest flight tickets to Sofia.

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

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

  • Arrive at the airport on time so you don't miss your DEN to SOF flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to prevent a last-minute sprint to your gate.

  • You'll likely experience bigger queues in popular months like July. Arriving up to four hours in advance for international flights and two hours for a domestic departure is a smart move.

  • We make it a breeze to book a flight with a stopover. To see your options for tickets from Denver International Airport to Sofia Airport, uncheck 'Direct flights only.' Then, pick a flight offering a stop long enough to tour the city of your choice. Popular stopovers between DEN and SOF include:

    • London Heathrow Airport

    • Frankfurt am Main Airport

    • Munich 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 £193. A return plane ticket is currently £553. Depending on the availability when you book, these fares can change.

  • It's often best to book ahead of time if you're looking for cheap tickets from DEN to SOF. That's because airlines change prices based on demand, which tends to increase closer to the date of departure.

  • Getting cheap flights from Denver International Airport to Sofia Airport is easy if you're flexible with your trip dates. Use the 'Whole month' search tool to see the best prices throughout the month and score a great deal.

  • Stay on top of deals for cheap flights from DEN to SOF by creating a Price Alert. You'll receive an email or notification on the app when fares go down.

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

Handy information about Denver International Airport (DEN)

  • DEN's address is 8500 Pena Boulevard.

  • 80% of flights departing from Denver International Airport touch down at their destination on time. With its strong performance rating, you're unlikely to be delayed when jetting out of DEN.

  • Central Denver to Denver International Airport is around 40 kms (25 miles). Depending on traffic, it'll take about 35 minutes to get there if you're driving, catching a taxi or ride-sharing.

  • The trip when using public transport will take about 35 minutes.

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

Arriving at Sofia Airport (SOF)

Getting from Sofia Airport (SOF) to central Sofia

  • From Sofia Airport, Sofia is approximately 10 kms (6 miles) away. It takes around 25 minutes to reach the centre driving.

  • It'll take around 30 minutes to get there using public transport.

When to fly to Sofia Airport (SOF)

  • The quietest month for a flight from Denver International Airport to Sofia Airport is March, while August is the busiest. Choose the ideal time to visit Sofia based on whether you prefer a more fast-paced or easygoing experience.

  • Book your flight from Denver International Airport to Sofia Airport for August if you'd like to explore Sofia during its warmest month. Expect temperatures of between 13ºC and 32ºC.

  • Look for cheap tickets from DEN to SOF in January if you like travelling in cooler conditions. Temperatures are at their lowest then, ranging between -11ºC and 7ºC on average.

Explore more of Bulgaria

  • Sofia has plenty going for it, but there are so many other parts of Bulgaria waiting to be explored. About 129 kms (80 miles) south-east of Sofia, a visit to Plovdiv will keep you on the go. Start with popular sights like Plovdiv Roman Theatre, Municipal Institute "Ancient Plovdiv" and Museum Centre for Contemporary History.

  • Varna is another must-experience destination in Bulgaria and is around 386 kms (240 miles) east of Sofia. No trip is complete without experiencing Sahara beach, Museum of Natural History and Sea Garden.

Plan the rest of your trip from Denver to Sofia

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.