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$574+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$702
(lastminute.com)

One-way from

$574
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$814
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 ($40 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 29, 2025.

This lastminute.com deal was found by Cheapflights users on 7/28. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/309:25 amSOF - DEN
1 stop17h 30mTurkish Airlines
Sat 9/67:50 pmDEN - SOF
1 stop15h 35mTurkish Airlines
Deal found 7/28$702
This Lufthansa deal was found by Cheapflights users on 7/27. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:15 amSOF - DEN
1 stop18h 20mLufthansa
Thu 9/114:15 pmDEN - SOF
1 stop21h 45mLufthansa
Deal found 7/27$763
This United Airlines deal was found by Cheapflights users on 7/28. 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 9/46:15 amSOF - DEN
1 stop18h 20mUnited Airlines
Mon 9/88:20 pmDEN - SOF
1 stop17h 40mUnited Airlines
Deal found 7/28$764
This Gotogate deal was found by Cheapflights users on 7/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/186:00 amSOF - DEN
1 stop16h 45mMultiple Airlines
Sun 8/2411:35 amDEN - SOF
2 stops21h 15mMultiple Airlines
Deal found 7/28$813

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, 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

Sat 8/30

9:25 am-5:55 pm

1 stop17h 30m

Denver Intl

Sat 9/6

7:50 pm-8:25 pm

1 stop15h 35m

$702

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 9/4

6:15 am-3:35 pm

1 stop18h 20m

Denver Intl

Thu 9/11

4:15 pm-11:00 pm

1 stop21h 45m

$763

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 9/4

6:15 am-3:35 pm

1 stop18h 20m

Denver Intl

Mon 9/8

8:20 pm-11:00 pm

1 stop17h 40m

$764

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 8/18

6:00 am-1:45 pm

1 stop16h 45m

Denver Intl

Sun 8/24

11:35 am-5:50 pm

2 stops21h 15m

$813

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 9/10

9:35 am-10:08 am

2 stops33h 33m

$574

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 12/9

6:00 am-1:40 pm

1 stop16h 40m

$668

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 9/10

10:50 am-4:20 pm

1 stop14h 30m

$679

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 12/8

12:30 pm-10:04 pm

2 stops42h 34m

$752

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 12/6

12:05 pm-3:30 pm

1 stop36h 25m

$762

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 12/6

7:00 am-3:30 pm

2 stops17h 30m

$774

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 11 results
1
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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, October is the cheapest month in which you can book a flight from Sofia to Denver (average of $197). Flying from Sofia to Denver in March is currently the most expensive (average of $278). 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 July 29, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 16% on flights from Sofia to Denver by exploring options for tickets in the afternoon.

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 July 29, 2025.
Get a feel of what it's like to fly with KLM, SWISS, and Qatar Airways 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.
KLM
7.8
Good
1,383 reviews

Food

7.3

Comfort

7.7

Overall

7.8

Crew

8.4

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,383 reviews
KLM
7.8
Good
1,383 reviews

Food

7.3

Comfort

7.7

Overall

7.8

Crew

8.4

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
SWISS
7.5
Good
1,683 reviews
KLM
7.8
Good
1,383 reviews

Food

7.3

Comfort

7.7

Overall

7.8

Crew

8.4

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Qatar Airways
7.4
Good
3,609 reviews
KLM
7.8
Good
1,383 reviews

Food

7.3

Comfort

7.7

Overall

7.8

Crew

8.4

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,896 reviews
KLM
7.8
Good
1,383 reviews

Food

7.3

Comfort

7.7

Overall

7.8

Crew

8.4

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Turkish Airlines
7.3
Good
3,925 reviews
KLM
7.8
Good
1,383 reviews

Food

7.3

Comfort

7.7

Overall

7.8

Crew

8.4

Boarding

7.8

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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.

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

    Turkish Airlines, at $702, 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 13% 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?

    $668 is the cheapest one-way deal found within the past few days, from Lufthansa. You may also be able to find cheap deals on SWISS and Qatar Airways, with prices starting from $679 and $752, 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.

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

    Currently, October is the cheapest month in which you can book a flight from Sofia to Denver (average of $197). Flying from Sofia to Denver in March is currently the most expensive (average of $278). 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
Westminster
Black Hawk
Winter Park
Lakewood
Greeley
Cripple Creek
Brighton
Silverthorne
Golden
Thornton
Frisco
Grand Lake
Manitou Springs
Central City
Fort Morgan
Glendale
Copper Mountain
Wheat Ridge
Longmont
Broomfield

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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, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$639Average$803FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$763FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$737Average$899FlexibilityNo cancel feeOn-time76%

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