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$380+ Cheap flights from Sofia (SOF) to Denver (DEN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/6. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheap flight deals from Sofia to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$801
(Kiwi.com)

One-way from

$380
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$884
Provider with most accurate pricing for Sofia-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Sofia-Denver Intl flights.
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From Sofia to Denver Intl
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One-way flight from Sofia to Denver Intl
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Highest demand for flights based on searches. 4% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Sofia to Denver

Cheapest flights from Sofia to Denver
Explore the most affordable flight options available from Sofia to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:10 amSOF - DEN
1 stop16h 30mLufthansa
Thu 11/1311:15 amDEN - SOF
2 stops17h 00mLufthansa
Deal found 10/26$801
This United Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/96:10 amSOF - DEN
1 stop16h 30mUnited Airlines
Sat 11/158:20 pmDEN - SOF
1 stop13h 00mUnited Airlines
Deal found 10/27$836
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:10 amSOF - DEN
2 stops19h 20mUnited Airlines
Thu 11/1311:15 amDEN - SOF
2 stops17h 35mUnited Airlines
Deal found 10/26$853
This Cheapflightsfares deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/96:10 amSOF - DEN
2 stops22h 19mLufthansa
Sat 11/1511:15 amDEN - SOF
2 stops22h 00mLufthansa
Deal found 10/27$857
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:05 amSOF - DEN
2 stops27h 10mUnited Airlines
Thu 12/118:20 pmDEN - SOF
1 stop31h 55mUnited Airlines
Deal found 10/26$913
This Mytrip deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:35 pmSOF - DEN
3 stops32h 30mMultiple Airlines
Thu 11/133:40 pmDEN - SOF
3 stops33h 10mMultiple Airlines
Deal found 10/26$924
This Lufthansa deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:05 amSOF - DEN
1 stop21h 50mLufthansa
Thu 12/118:20 pmDEN - SOF
1 stop31h 55mLufthansa
Deal found 10/26$1,119

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 28, 2025.
Use the filters below to find and compare flights from Sofia to Denver that are best for you.

Fly from

Sofia

Fly to

Denver

Route

Depart

Return

Price

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 11/7

6:10 am-1:40 pm

1 stop16h 30m

Denver Intl

Thu 11/13

11:15 am-1:15 pm

2 stops17h 00m

$801

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 11/9

6:10 am-1:40 pm

1 stop16h 30m

Denver Intl

Sat 11/15

8:20 pm-6:20 pm

1 stop13h 00m

$836

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 11/7

6:10 am-4:30 pm

2 stops19h 20m

Denver Intl

Thu 11/13

11:15 am-1:50 pm

2 stops17h 35m

$853

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 11/9

6:10 am-7:29 pm

2 stops22h 19m

Denver Intl

Sat 11/15

11:15 am-6:15 pm

2 stops22h 00m

$857

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 11/28

6:05 am-12:15 am

2 stops27h 10m

Denver Intl

Thu 12/11

8:20 pm-1:15 pm

1 stop31h 55m

$913

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 11/7

6:35 pm-6:05 pm

3 stops32h 30m

Denver Intl

Thu 11/13

3:40 pm-9:50 am

3 stops33h 10m

$924

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

7:00 am-10:29 pm

2 stops24h 29m

Denver Intl

Mon 4/27

12:20 pm-2:00 pm

2 stops16h 40m

$947

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 12/6

6:15 am-9:49 pm

3 stops48h 34m

$380

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 12/7

7:00 pm-8:13 pm

3 stops58h 13m

$411

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 3/7

4:45 pm-8:52 am

2 stops49h 07m

$433

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 16 results
1
2

Compare providers for flights from Sofia to Denver

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Sofia to Denver in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Sofia-Denver flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Sofia-Denver flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Sofia-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Sofia-Denver flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Sofia-Denver flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Sofia to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Sofia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Sofia to Denver

What is the cheapest month to book a flight from Sofia to Denver?

Currently, December is the cheapest month in which you can book a flight from Sofia to Denver (average of $711). Flying from Sofia to Denver in August is currently the most expensive (average of $834). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SOF to DEN?

Find hourly flight availability from Sofia to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 28, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 15% on flights from Sofia to Denver by exploring options for tickets in the evening.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated October 28, 2025.
Get a feel of what it's like to fly with United Airlines, Turkish Airlines, and Lufthansa from Sofia to Denver by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,996 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
8,996 reviews
United Airlines
7.4
Good
8,996 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Turkish Airlines
7.3
Good
4,029 reviews
United Airlines
7.4
Good
8,996 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Lufthansa
6.8
Okay
7,532 reviews
United Airlines
7.4
Good
8,996 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

Find useful and relevant information for your journey from Sofia to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Sofia to Denver?

    A quick flight from Sofia to Denver can take about 16h 30m. Lufthansa provides one of the quickest options available for as low as $801. The distance from Sofia to Denver is about 5871 mi.

  • What are the cheapest airlines flying from Sofia to Denver round-trip?

    Turkish Airlines, at $704, was found to be the cheapest airline from Sofia to Denver.Alternate airlines to your destination round-trip include United Airlines and Lufthansa. Turkish Airlines is priced at 17% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Sofia to Denver that include hotel bookings?

    Yes. In addition to deals on Sofia to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Sofia to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sofia to Denver.

  • Can I find deals for business class flights from Sofia to Denver?

    Yes. Cheapflights offers flight deals from Sofia to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Sofia to Denver?

    Currently, December is the cheapest month in which you can book a flight from Sofia to Denver (average of $711). Flying from Sofia to Denver in August is currently the most expensive (average of $834). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Westminster
Broomfield
Lakewood
Golden
Winter Park
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Central City
Manitou Springs
Fort Morgan
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Sofia to Denver

Discover the top 3 airlines that operate flights from Sofia to Denver. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$803FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$785FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$745Average$1,000FlexibilityNo cancel feeOn-time76%

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