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$556+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
May 28 — Jun 41
Thu 5/28
Thu 6/4
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 April 28, 2026.

This United Airlines deal was found by Cheapflights users on 4/28. 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 5/216:30 am
SOF
-
DEN
1 stop16h 00m
United Airlines
Wed 5/274:05 pm
DEN
-
SOF
1 stop22h 10m
United Airlines
Deal found 4/28$972
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Sat 5/306:20 am
SOF
-
DEN
2 stops33h 33m
United Airlines
Mon 6/81:53 pm
DEN
-
SOF
2 stops19h 07m
United Airlines
Deal found 4/28$980
This United Airlines deal was found by Cheapflights users on 4/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/146:20 am
SOF
-
DEN
2 stops22h 25m
United Airlines
Sun 8/3010:20 am
DEN
-
SOF
2 stops16h 50m
United Airlines
Deal found 4/25$985
This Air Canada deal was found by Cheapflights users on 4/28. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/146:10 am
SOF
-
DEN
2 stops26h 00m
Air Canada
Sun 8/309:40 am
DEN
-
SOF
2 stops18h 55m
Air Canada
Deal found 4/28$987
This FlightHub deal was found by Cheapflights users on 4/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/149:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Sun 8/308:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Deal found 4/28$1,032

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 April 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$980
(United Airlines)

One-way from

$556
(Kiwi.com)

Popular in

August

Cheapest in

September

Average price

$849
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
One-way flight from Sofia to Denver Intl
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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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 April 28, 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
Quickest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 5/21

6:30 am-1:30 pm

1 stop16h 00m

Denver Intl

Wed 5/27

9:35 am-10:40 am

2 stops16h 05m

$978

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 6/14

6:20 am-12:30 am

2 stops27h 10m

Denver Intl

Sun 8/30

4:15 pm-11:15 pm

1 stop22h 00m

$980

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 5/30

6:20 am-6:53 am

2 stops33h 33m

Denver Intl

Mon 6/8

1:53 pm-6:00 pm

2 stops19h 07m

$980

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 6/14

6:10 am-11:10 pm

2 stops26h 00m

Denver Intl

Sun 8/30

9:40 am-1:35 pm

2 stops18h 55m

$987

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 5/30

6:10 am-2:20 pm

1 stop17h 10m

Denver Intl

Mon 6/8

8:25 pm-11:15 pm

1 stop17h 50m

$1,056

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 5/30

6:10 am-2:20 pm

1 stop17h 10m

Denver Intl

Mon 6/8

6:10 pm-11:00 am

2 stops31h 50m

$1,073
Cheapest one-way
Quickest one-way

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 9/22

11:25 pm-4:43 pm

3 stops50h 18m

$556

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/24

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?

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 April 28, 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
4,343 reviews

Crew

7.8

Entertainment

7.5

Comfort

7.3

Food

7.5

Overall

7.4

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
4,343 reviews
Turkish Airlines
7.4
Good
4,343 reviews

Crew

7.8

Entertainment

7.5

Comfort

7.3

Food

7.5

Overall

7.4

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
9,675 reviews
Turkish Airlines
7.4
Good
4,343 reviews

Crew

7.8

Entertainment

7.5

Comfort

7.3

Food

7.5

Overall

7.4

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
7,956 reviews
Turkish Airlines
7.4
Good
4,343 reviews

Crew

7.8

Entertainment

7.5

Comfort

7.3

Food

7.5

Overall

7.4

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 26h. United Airlines provides one of the quickest options available for as low as $987. The distance from Sofia to Denver is about 5871 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 22% 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?

    $770 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 $799 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
Black Hawk
Lakewood
Westminster
Broomfield
Golden
Centennial
Greeley
Lone Tree
Wheat Ridge
Silverthorne
Central City
Cripple Creek
Winter Park
Manitou Springs
Frisco
Englewood
Fort Morgan
Glendale
Evergreen

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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 April 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$862FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$785Average$873FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$802Average$1,013FlexibilityNo cancel feeOn-time76%

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