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$922+ Cheap flights from Sofia (SOF) to Denver (DEN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
1 adult, Economy
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Cheap 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 July 29, 2026.

This Gotogate deal was found by Cheapflights users on 7/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:30 am
SOF
-
DEN
1 stop18h 10m
Lufthansa
Wed 9/95:40 pm
DEN
-
SOF
1 stop20h 10m
Lufthansa
Deal found 7/25$922
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Thu 9/36:30 am
SOF
-
DEN
1 stop18h 10m
United Airlines
Wed 9/91:58 pm
DEN
-
SOF
2 stops19h 42m
United Airlines
Deal found 7/29$956
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Thu 9/106:30 am
SOF
-
DEN
1 stop18h 10m
United Airlines
Thu 9/1711:35 am
DEN
-
SOF
2 stops26h 05m
United Airlines
Deal found 7/29$961
This Gotogate deal was found by Cheapflights users on 7/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Thu 9/178:30 pm
DEN
-
SOF
1 stop27h 15m
Turkish Airlines
Deal found 7/29$1,000

Find 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 July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$922
(Gotogate)

Popular in

July

Cheapest in

September

Average price

$1,214
Provider with most accurate pricing for Sofia-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Denver Intl flights.
Search Deals
From Sofia to Denver Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($175 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

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 July 29, 2026.
Use the filters below to find and compare flights from Sofia to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 9/3

6:30 am-3:40 pm

1 stop18h 10m

Denver Intl

Wed 9/9

5:40 pm-10:50 pm

1 stop20h 10m

$949

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 9/3

6:30 am-3:40 pm

1 stop18h 10m

Denver Intl

Wed 9/9

1:58 pm-6:40 pm

2 stops19h 42m

$956

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 9/10

6:30 am-3:40 pm

1 stop18h 10m

Denver Intl

Thu 9/17

11:35 am-10:40 pm

2 stops26h 05m

$961

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 9/3

6:45 pm-12:40 pm

3 stops26h 55m

Denver Intl

Wed 9/9

8:10 pm-12:40 am

2 stops19h 30m

$1,207

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 8/24

8:10 pm-3:29 pm

2 stops52h 19m

Denver Intl

Thu 11/12

9:07 am-7:20 pm

2 stops25h 13m

$1,936

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 8/24

8:10 pm-4:30 pm

1 stop29h 20m

Denver Intl

Tue 11/10

5:01 pm-8:10 pm

1 stop18h 09m

$1,965

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 8/26

9:25 pm-11:53 pm

2 stops35h 28m

Denver Intl

Tue 11/10

1:12 pm-8:10 pm

2 stops21h 58m

$1,970
Quickest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 8/26

6:10 am-1:45 pm

1 stop16h 35m

Denver Intl

Wed 11/11

8:30 pm-6:20 pm

1 stop12h 50m

$3,677

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Sorted by cheapest first
  • Most accurate provider: When it comes to deals on Sofia-Denver flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Sofia-Denver flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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

How much does it cost to fly round-trip from Sofia to Denver?

Airfare is below average for this route at the moment.

Sofia to Denver flights typically cost between $965 and $1,095 in September.
The cheapest round-trip price found within the last 5 days was $922 on Lufthansa (Sep 3-Sep 9).

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 July 29, 2026.
Get a feel of what it's like to fly with Turkish Airlines,United Airlines, andLufthansa 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.
Turkish Airlines
7.4
Good
4,455 reviews

Entertainment

7.5

Comfort

7.3

Overall

7.4

Food

7.5

Crew

7.8

Boarding

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
Turkish Airlines
7.4
Good
4,455 reviews
Turkish Airlines
7.4
Good
4,455 reviews

Entertainment

7.5

Comfort

7.3

Overall

7.4

Food

7.5

Crew

7.8

Boarding

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
United Airlines
7.4
Good
10,052 reviews
Turkish Airlines
7.4
Good
4,455 reviews

Entertainment

7.5

Comfort

7.3

Overall

7.4

Food

7.5

Crew

7.8

Boarding

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
Lufthansa
6.8
Okay
8,163 reviews
Turkish Airlines
7.4
Good
4,455 reviews

Entertainment

7.5

Comfort

7.3

Overall

7.4

Food

7.5

Crew

7.8

Boarding

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you

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 18h 10m. Lufthansa provides one of the quickest options available for as low as $949. 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 Lufthansa and United Airlines. Turkish Airlines is priced at 28% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Sofia to Denver one-way?

    $753 is the cheapest one-way deal found within the past few days, from Turkish Airlines. You may also be able to find cheap deals on Lufthansa and United Airlines, with prices starting from $821 and $845, respectively.

  • 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.

See more FAQs

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Thornton
Westminster
Black Hawk
Centennial
Lakewood
Broomfield
Golden
Lone Tree
Wheat Ridge
Silverthorne
Greeley
Central City
Fort Morgan
Cripple Creek
Winter Park
Manitou Springs
Frisco
Englewood
Glendale
Evergreen

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 July 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$865FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$810Average$1,014FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$833Average$974FlexibilityNo cancel feeOn-time69%

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