An escalator in a modern building with geometric wall patterns and overhead lighting.

$592 Cheap Flights from Sofia (SOF) to Denver (DEN)

View $592 flight on Wed, Dec 2, 2026Opens in a new window

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

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Sofia to Denver (SOF-DEN)

Prices were available within the past 7 days and start at $592 for one-way flights and $928 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Lufthansa
Tue, Feb 23 - Wed, Mar 24
SOF
Sofia
DEN
Denver
$928 Roundtrip, found 3 days ago
$928
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Tue, Feb 23 from Sofia to Denver, returning Wed, Mar 24, priced at $928 found 3 days ago
Lufthansa
Tue, Feb 23 - Wed, Mar 24
SOF
Sofia
DEN
Denver
$930 Roundtrip, found 3 days ago
$930
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Tue, Feb 23 from Sofia to Denver, returning Wed, Mar 24, priced at $930 found 3 days ago
Turkish Airlines
Tue, Feb 23 - Wed, Mar 24
SOF
Sofia
DEN
Denver
$949 Roundtrip, found 3 days ago
$949
Roundtrip
found 3 days ago
Select Turkish Airlines flight, departing Tue, Feb 23 from Sofia to Denver, returning Wed, Mar 24, priced at $949 found 3 days ago
Lufthansa
Thu, Sep 3 - Wed, Sep 9
SOF
Sofia
DEN
Denver
$954 Roundtrip, found 22 hours ago
$954
Roundtrip
found 22 hours ago
Select Lufthansa flight, departing Thu, Sep 3 from Sofia to Denver, returning Wed, Sep 9, priced at $954 found 22 hours ago
Lufthansa
Thu, Sep 3 - Wed, Sep 9
SOF
Sofia
DEN
Denver
$955 Roundtrip, found 22 hours ago
$955
Roundtrip
found 22 hours ago
Select Lufthansa flight, departing Thu, Sep 3 from Sofia to Denver, returning Wed, Sep 9, priced at $955 found 22 hours ago
United
Thu, Sep 24 - Sun, Oct 4
SOF
Sofia
DEN
Denver
$957 Roundtrip, found 2 days ago
$957
Roundtrip
found 2 days ago
Select United flight, departing Thu, Sep 24 from Sofia to Denver, returning Sun, Oct 4, priced at $957 found 2 days ago
British Airways
Fri, Jan 15 - Tue, May 18
SOF
Sofia
DEN
Denver
$958 Roundtrip, found 3 days ago
$958
Roundtrip
found 3 days ago
Select British Airways flight, departing Fri, Jan 15 from Sofia to Denver, returning Tue, May 18, priced at $958 found 3 days ago
United
Thu, Oct 1 - Wed, Oct 7
SOF
Sofia
DEN
Denver
$960 Roundtrip, found 2 days ago
$960
Roundtrip
found 2 days ago
Select United flight, departing Thu, Oct 1 from Sofia to Denver, returning Wed, Oct 7, priced at $960 found 2 days ago
Air Canada
Thu, Oct 1 - Wed, Oct 7
SOF
Sofia
DEN
Denver
$964 Roundtrip, found 2 days ago
$964
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Oct 1 from Sofia to Denver, returning Wed, Oct 7, priced at $964 found 2 days ago
Air Canada
Tue, Oct 6 - Tue, Nov 3
SOF
Sofia
DEN
Denver
$965 Roundtrip, found 2 days ago
$965
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, Oct 6 from Sofia to Denver, returning Tue, Nov 3, priced at $965 found 2 days ago

What you need to know for your flight from Sofia to Denver Intl.

Sofia (SOF) to Denver (DEN) at a glance

Travel on various airlines that offer routes from Sofia (SOF) to Denver (DEN) for this international long-haul journey. Compare options from full-service carriers to discover the itinerary that suits your budget, schedule, and travel needs as you visit Denver’s renowned attractions and neighborhoods. Check out the essential details for flights departing from Sofia Airport (SOF) and arriving at Denver International Airport (DEN).

  • Fastest flight duration: around 13 hours in-flight, plus roughly 3h 30m layover with one stop
  • Route distance: roughly 5,900 miles (9,500 km)
  • Flights per week: around 7 departures on average
  • Typical fares (one-way): economy tickets often range from $395–$1180, depending on seasonality and how far ahead you book

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

Based on the latest traveler bookings, here are the top airlines favored for flights from Sofia to Denver, especially for one-stop and multi-stop options. Common layover points include Munich's Franz Josef Strauss International Airport (MUC) with an approximate 4-hour and 15-minute layover, Istanbul Airport (IST) with around a 3-hour and 30-minute layover, and Frankfurt International Airport (FRA) also with a 3-hour and 30-minute layover. These choices allow you to balance cost, travel time, and cabin class to create your ideal itinerary.

  • Lufthansa: As a full-service airline providing one-stop options, Lufthansa's one-way fares generally range from $445 to $1,180. This carrier represents about 42% of flights on this route, with an in-flight duration of 13 hours and an overall travel time of approximately 17 hours, including layover time.
  • Turkish Airlines: Offering one-stop service as a full-service carrier, Turkish Airlines has one-way ticket prices typically between $395 and $955. With roughly 21% of the departures on this route, passengers can expect a flight time of 13 hours and a total journey of around 17 hours, factoring in the layover.
  • United: This full-service airline provides one-stop flights, with one-way fares usually between $620 and $970. United accounts for about 17% of departures along this route, featuring an in-flight time of 13 hours and a total travel duration of roughly 17 hours, including layover time.

Alternative route from Sofia (SOF) to Denver (DEN)

  • Sofia to Colorado Springs (SOF-COS): Colorado Springs Airport (COS) is located approximately 73 miles from Denver International Airport (DEN).

How to find the best prices for flights from Sofia (SOF) to Denver (DEN)

Getting some of the best deals on flights from Sofia to Denver is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are typically available when booking at least two months in advance, although most travelers tend to book within two weeks. Morning departures, between 5 AM and 12 PM, often offer lower prices and are the most popular times to fly. Additionally, Thursday usually has cheaper prices, while Sunday remains the most popular travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Denver International Airport from Sofia Airport

Denver welcomes travelers from Sofia with a range of transport options based on price, convenience, and proximity. Here's how to reach Denver efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Denver, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Denver International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Denver International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Denver International Airport, Jeppesen Terminal Station, a metro station, is located about 0.1 miles away on foot, providing easy access to public transport for travelers.

Frequently asked questions

How much does a flight from Sofia (SOF) to Denver, CO (DEN-Denver Intl.) cost?
You can find cheap one-way flights from $592 and cheap return flights from $928 Sofia (SOF) to Denver, CO (DEN-Denver Intl.) with Expedia. One-way flights typically cost between $835 and $3707, and return flights often range between $927 and $3677. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Sofia (SOF) to Denver, CO (DEN-Denver Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
The cheapest month to fly from SOF to DEN is February when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
Enter SOF to DEN and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
JetBlue Airways is one of the cheapest airlines offering connecting flights from Sofia (SOF) to Denver (DEN), with round-trip tickets starting from around $693 with a layover in Nikola Tesla (BEG). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
To find a cheap flight from Sofia (SOF) to Denver, CO (DEN-Denver Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from SOF to DEN. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
For flights from Sofia (SOF) to Denver Intl. (DEN), the most popular departure times are in the early morning, from 6am to 9am. This time window captures around 58% of total traffic, making it a preferred choice for travelers heading to Denver.
How long does it take to fly from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
Flights from SOF to DEN with one stop typically take around 21 hours 50 minutes, covering approximately 5,876 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Sofia (SOF) to Denver, CO (DEN-Denver Intl.)?
Select the "Business class" and "First class" filters when looking for SOF to DEN flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Sofia (SOF) to Denver, CO (DEN-Denver Intl.) flight with Expedia?
It's easy to earn miles on a Sofia (SOF) to Denver, CO (DEN-Denver Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Denver from SOF (SOF)?
If you're planning to travel to Denver from SOF (SOF), you can fly into Denver Intl. (DEN) Some flights may connect through major hubs like Frankfurt Intl. (FRA), Franz Josef Strauss Intl. (MUC), Vienna Intl. (VIE) before reaching Denver. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Sofia (SOF) to Denver, CO (DEN-Denver Intl.) at the last minute?
Typically, booking a last minute flight from Sofia (SOF) to Denver, CO (DEN-Denver Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Sofia (SOF) to Denver, CO (DEN-Denver Intl.) flight and hotel package?
Securing a Sofia (SOF) to Denver, CO (DEN-Denver Intl.) Denver Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals 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 (SOF) to Denver, CO (DEN-Denver Intl.)?
If you booked your Sofia (SOF) to Denver, CO (DEN-Denver Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Sofia
Destination airport
Denver Intl.
Airlines serving
Air Canada, Austrian Airlines, British Airways, ITA Airways, JetBlue Airways, Lufthansa, Swiss International Air Lines, Turkish Airlines, United
Roundtrip price
$928
Distance
5875 mi

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 February. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $592 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

*Flight schedules are subject to change.

*Available to One Key members.

 

Explore a world of travel with Expedia