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$534+ 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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
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 March 10, 2026.

This United Airlines deal was found by Cheapflights users on 3/7. 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 4/26:30 am
SOF
-
DEN
1 stop16h 05m
United Airlines
Wed 4/88:25 pm
DEN
-
SOF
1 stop17h 35m
United Airlines
Deal found 3/7$858
This Lufthansa deal was found by Cheapflights users on 3/6. 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.
Thu 4/236:30 am
SOF
-
DEN
1 stop18h 10m
Lufthansa
Wed 4/294:05 pm
DEN
-
SOF
1 stop21h 55m
Lufthansa
Deal found 3/6$859
This United Airlines deal was found by Cheapflights users on 3/6. 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 4/236:30 am
SOF
-
DEN
1 stop16h 05m
United Airlines
Wed 4/294:35 pm
DEN
-
SOF
2 stops17h 05m
United Airlines
Deal found 3/6$864
This Lufthansa deal was found by Cheapflights users on 3/9. 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.
Mon 5/46:20 am
SOF
-
DEN
1 stop18h 20m
Lufthansa
Mon 5/114:05 pm
DEN
-
SOF
1 stop21h 55m
Lufthansa
Deal found 3/9$881
This Gotogate deal was found by Cheapflights users on 3/9. 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.
Mon 5/46:20 am
SOF
-
DEN
2 stops25h 50m
Multiple Airlines
Mon 5/115:40 pm
DEN
-
SOF
1 stop15h 20m
Multiple Airlines
Deal found 3/9$892
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Mon 5/46:20 am
SOF
-
DEN
1 stop16h 15m
United Airlines
Mon 5/118:25 pm
DEN
-
SOF
1 stop17h 35m
United Airlines
Deal found 3/9$893
This Justfly.com deal was found by Cheapflights users on 3/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:20 am
SOF
-
DEN
2 stops20h 52m
Air Canada
Mon 5/119:30 am
DEN
-
SOF
2 stops18h 55m
Air Canada
Deal found 3/9$895
This Flighttix deal was found by Cheapflights users on 3/7. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:10 am
SOF
-
DEN
1 stop18h 30m
Lufthansa
Thu 5/288:25 pm
DEN
-
SOF
1 stop13h 15m
Lufthansa
Deal found 3/7$976

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$858
(United Airlines)

One-way from

$534
(Kiwi.com)

Popular in

May

Cheapest in

September

Average price

$1,021
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, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 10, 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

Tue 5/12

6:10 am-3:40 pm

1 stop18h 30m

Denver Intl

Thu 5/28

6:13 am-6:40 pm

2 stops27h 27m

$858

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/2

6:30 am-1:35 pm

1 stop16h 05m

Denver Intl

Wed 4/8

8:25 pm-11:00 pm

1 stop17h 35m

$858

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

6:30 am-3:40 pm

1 stop18h 10m

Denver Intl

Wed 4/29

4:05 pm-11:00 pm

1 stop21h 55m

$859
Quickest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

6:30 am-1:35 pm

1 stop16h 05m

Denver Intl

Wed 4/29

4:35 pm-6:40 pm

2 stops17h 05m

$864

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/4

6:20 am-3:40 pm

1 stop18h 20m

Denver Intl

Mon 5/11

4:05 pm-11:00 pm

1 stop21h 55m

$881

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/4

6:20 am-1:35 pm

1 stop16h 15m

Denver Intl

Mon 5/11

8:25 pm-11:00 pm

1 stop17h 35m

$893

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/4

12:55 pm-11:10 pm

2 stops19h 15m

Denver Intl

Mon 5/11

9:40 am-10:30 pm

3 stops27h 50m

$1,329

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

5:00 am-7:00 pm

3 stops23h 00m

Denver Intl

Wed 4/29

1:25 pm-11:10 am

2 stops36h 45m

$1,421
Cheapest one-way

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 3/17

3:10 pm-12:52 pm

3 stops53h 42m

$534

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 6/1

8:10 pm-11:59 pm

2 stops36h 49m

$585

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 14 resultsSorted by cheapest first
1
2
  • 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.

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 March 10, 2026.
Get a feel of what it's like to fly with United Airlines,Turkish 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.
United Airlines
7.4
Good
9,409 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,409 reviews
United Airlines
7.4
Good
9,409 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Turkish Airlines
7.3
Good
4,249 reviews
United Airlines
7.4
Good
9,409 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Lufthansa
6.8
Okay
7,840 reviews
United Airlines
7.4
Good
9,409 reviews

Crew

8.1

Overall

7.4

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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. United Airlines provides one of the quickest options available for as low as $859. 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 23% 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 $771 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
Broomfield
Westminster
Golden
Centennial
Greeley
Lone Tree
Wheat Ridge
Silverthorne
Central City
Cripple Creek
Winter Park
Glendale
Manitou Springs
Frisco
Fort Morgan
Brighton
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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$860FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$763Average$862FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$784Average$1,013FlexibilityNo cancel feeOn-time76%

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