$514 Cheap Flights from Sofia (SOF) to Denver (DEN)

View $514 flight on Wed, May 6, 2026Opens 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 $514 for one-way flights and $814 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Sat, Jan 17 - Sun, Jan 18
SOF
Sofia
DEN
Denver
$814 Roundtrip, found 4 days ago
$814
Roundtrip
found 4 days ago
Select KLM flight, departing Sat, Jan 17 from Sofia to Denver, returning Sun, Jan 18, priced at $814 found 4 days ago
Air Canada
Wed, Nov 19 - Fri, Jan 30
SOF
Sofia
DEN
Denver
$820 Roundtrip, found 5 days ago
$820
Roundtrip
found 5 days ago
Select Air Canada flight, departing Wed, Nov 19 from Sofia to Denver, returning Fri, Jan 30, priced at $820 found 5 days ago
Lufthansa
Wed, Nov 19 - Fri, Jan 30
SOF
Sofia
DEN
Denver
$820 Roundtrip, found 5 days ago
$820
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Nov 19 from Sofia to Denver, returning Fri, Jan 30, priced at $820 found 5 days ago
Lufthansa
Fri, Oct 31 - Sat, Nov 8
SOF
Sofia
DEN
Denver
$821 Roundtrip, found 3 days ago
$821
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Fri, Oct 31 from Sofia to Denver, returning Sat, Nov 8, priced at $821 found 3 days ago
Air Canada
Wed, Nov 19 - Fri, Jan 30
SOF
Sofia
DEN
Denver
$822 Roundtrip, found 5 days ago
$822
Roundtrip
found 5 days ago
Select Air Canada flight, departing Wed, Nov 19 from Sofia to Denver, returning Fri, Jan 30, priced at $822 found 5 days ago
British Airways
Sun, Apr 26 - Sun, May 10
SOF
Sofia
DEN
Denver
$822 Roundtrip, found 1 hour ago
$822
Roundtrip
found 1 hour ago
Select British Airways flight, departing Sun, Apr 26 from Sofia to Denver, returning Sun, May 10, priced at $822 found 1 hour ago
Air Canada
Fri, Oct 31 - Sat, Nov 8
SOF
Sofia
DEN
Denver
$823 Roundtrip, found 3 days ago
$823
Roundtrip
found 3 days ago
Select Air Canada flight, departing Fri, Oct 31 from Sofia to Denver, returning Sat, Nov 8, priced at $823 found 3 days ago
Lufthansa
Wed, Nov 19 - Fri, Jan 30
SOF
Sofia
DEN
Denver
$825 Roundtrip, found 5 days ago
$825
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Nov 19 from Sofia to Denver, returning Fri, Jan 30, priced at $825 found 5 days ago
Lufthansa
Wed, Nov 19 - Fri, Jan 30
SOF
Sofia
DEN
Denver
$825 Roundtrip, found 5 days ago
$825
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Nov 19 from Sofia to Denver, returning Fri, Jan 30, priced at $825 found 5 days ago
United
Sun, Apr 19 - Sat, May 2
SOF
Sofia
DEN
Denver
$870 Roundtrip, found 1 hour ago
$870
Roundtrip
found 1 hour ago
Select United flight, departing Sun, Apr 19 from Sofia to Denver, returning Sat, May 2, priced at $870 found 1 hour 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 $1,083
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $1,083

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 $514 or cheap return flight from $814 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 January, 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.

Travel information

Travel information

Origin airport
Sofia
Destination airport
Denver Intl.
Airlines serving
Air Canada, Austrian Airlines, British Airways, Lufthansa, Turkish Airlines
Roundtrip price
$814
Distance
5875 mi

Book with confidence

Book with confidence

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 January. 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 $514 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.

 

Sofia to Denver Flights

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*Available to One Key members.