$562 Cheap Flights from Sofia (SOF) to Denver (DEN)

View $562 flight on Mon, Oct 27, 2025Opens in a new window

Popular airlines from Sofia Airport (SOF) to Denver Intl. Airport (DEN)

Cheap Flights from Sofia to Denver (SOF-DEN)

Prices were available within the past 7 days and start at $562 for one-way flights and $747 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Turkish Airlines
Fri, Sep 5 - Sat, Sep 20
SOF
Sofia
DEN
Denver
$747 Roundtrip, found 4 days ago
$747
Roundtrip
found 4 days ago
Select Turkish Airlines flight, departing Fri, Sep 5 from Sofia to Denver, returning Sat, Sep 20, priced at $747 found 4 days ago
Turkish Airlines
Thu, Aug 28 - Thu, Sep 4
SOF
Sofia
DEN
Denver
$749 Roundtrip, found 19 hours ago
$749
Roundtrip
found 19 hours ago
Select Turkish Airlines flight, departing Thu, Aug 28 from Sofia to Denver, returning Thu, Sep 4, priced at $749 found 19 hours ago
Turkish Airlines
Sat, Oct 4 - Thu, Oct 16
SOF
Sofia
DEN
Denver
$751 Roundtrip, found 3 days ago
$751
Roundtrip
found 3 days ago
Select Turkish Airlines flight, departing Sat, Oct 4 from Sofia to Denver, returning Thu, Oct 16, priced at $751 found 3 days ago
Turkish Airlines
Tue, Aug 26 - Thu, Sep 4
SOF
Sofia
DEN
Denver
$753 Roundtrip, found 19 hours ago
$753
Roundtrip
found 19 hours ago
Select Turkish Airlines flight, departing Tue, Aug 26 from Sofia to Denver, returning Thu, Sep 4, priced at $753 found 19 hours ago
Turkish Airlines
Fri, Oct 17 - Tue, Oct 28
SOF
Sofia
DEN
Denver
$754 Roundtrip, found 4 days ago
$754
Roundtrip
found 4 days ago
Select Turkish Airlines flight, departing Fri, Oct 17 from Sofia to Denver, returning Tue, Oct 28, priced at $754 found 4 days ago
Turkish Airlines
Tue, Aug 26 - Sun, Aug 31
SOF
Sofia
DEN
Denver
$756 Roundtrip, found 19 hours ago
$756
Roundtrip
found 19 hours ago
Select Turkish Airlines flight, departing Tue, Aug 26 from Sofia to Denver, returning Sun, Aug 31, priced at $756 found 19 hours ago
Lufthansa
Thu, Sep 4 - Thu, Oct 2
SOF
Sofia
DEN
Denver
$757 Roundtrip, found 4 days ago
$757
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Thu, Sep 4 from Sofia to Denver, returning Thu, Oct 2, priced at $757 found 4 days ago
Swiss International Air Lines
Wed, Sep 24 - Wed, Oct 1
SOF
Sofia
DEN
Denver
$778 Roundtrip, found 1 day ago
$778
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Wed, Sep 24 from Sofia to Denver, returning Wed, Oct 1, priced at $778 found 1 day ago
American Airlines
Mon, Oct 27 - Sun, Nov 16
SOF
Sofia
DEN
Denver
$779 Roundtrip, found 4 days ago
$779
Roundtrip
found 4 days ago
Select American Airlines flight, departing Mon, Oct 27 from Sofia to Denver, returning Sun, Nov 16, priced at $779 found 4 days ago
United
Thu, Oct 16 - Wed, Oct 29
SOF
Sofia
DEN
Denver
$780 Roundtrip, found 4 days ago
$780
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 16 from Sofia to Denver, returning Wed, Oct 29, priced at $780 found 4 days ago

Alternative airports near Denver

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

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $794
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $794
Flights from Sofia (SOF) to Denver (DEN)
Origin airport
Sofia
Destination airport
Denver Intl.
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, ITA Airways, KLM, Lufthansa, Qatar Airways, Swiss International Air Lines, Turkish Airlines, United
Roundtrip price
$747
Distance
5875 mi

Sofia to Denver Flights

The cheapest times to fly from Sofia to Denver

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 Sofia to Denver are during the month of September. You can find some of the cheapest flights from Sofia to Denver with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sofia to Denver

Sunday is one of the best days to book for cheap flights from Sofia to Denver: 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 Sofia to Denver

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 Sofia to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $562 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 Sofia to Denver 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 Sofia to Denver 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 Sofia Airport (SOF) to Denver Intl. Airport (DEN) cost?
Grab a cheap one-way flight from $562 or cheap return flight from $747 from Sofia Airport (SOF) to Denver Intl. Airport (DEN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Sofia Airport (SOF) to Denver Intl. Airport (DEN)?
The cheapest month to fly from SOF to DEN is September, when there's less demand. Off-peak season is often when better flight deals are available between these airports.
What is the cheapest airline that flies from Sofia Airport (SOF) to Denver Intl. Airport (DEN)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SOF to DEN flight.
How many flights per day from Sofia Airport (SOF) to Denver Intl. Airport (DEN)?
You'll have to catch a flight with a layover if you're traveling from Sofia Airport (SOF) to Denver Intl. Airport (DEN). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from SOF to DEN?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change depending on a range of factors, such as the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sofia Airport (SOF) to Denver Intl. Airport (DEN)?
To arrive at Denver Intl. Airport (DEN) without delays, book a flight that leaves Sofia Airport (SOF) 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 Sofia Airport (SOF) to Denver Intl. Airport (DEN) last-minute?
Holding off until just before your departure to book your flight from SOF to DEN often results in higher prices. While you may find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans to maximize your chances of landing a bargain.
Is it cheaper to book a SOF to DEN flight and hotel package?
Booking a SOF to DEN flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our wide range of stays and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Sofia Airport (SOF) to Denver Intl. Airport (DEN)?
It's generally possible to reschedule or cancel your SOF to DEN flight. However, for bookings made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.