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Sofia

$500+ Cheap flights from Denver (DEN) to Sofia (SOF)

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to Sofia are usually found in April or February, booked 48 days in advance, depart on a Thursday or Sunday and return on a Friday

Cheap flight deals from Denver to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Sofia (SOF). 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

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$553
(KAYAK)

One-way from

$500
(Ovago)

Popular in

May

Cheapest in

April

Average price

$631
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
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From Denver Intl to Sofia
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One-way flight from Denver Intl to Sofia
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($140 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($38 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 Denver to Sofia

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

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.
Tue 11/185:25 pmDEN - SOF
2 stops15h 55mUnited Airlines
Thu 11/276:00 amSOF - DEN
2 stops22h 55mUnited Airlines
Deal found 10/26$578
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:20 pmDEN - SOF
1 stop16h 30mTurkish Airlines
Mon 11/109:40 pmSOF - DEN
1 stop28h 55mTurkish Airlines
Deal found 10/26$581
This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:20 pmDEN - SOF
1 stop16h 30mTurkish Airlines
Tue 11/119:35 amSOF - DEN
1 stop17h 00mTurkish Airlines
Deal found 10/28$658
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/184:20 pmDEN - SOF
1 stop17h 00mLufthansa
Thu 11/276:00 amSOF - DEN
1 stop19h 00mLufthansa
Deal found 10/28$659
This FlightHub deal was found by Cheapflights users on 10/28. 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.
Tue 12/94:20 pmDEN - SOF
1 stop21h 25mLufthansa
Tue 1/62:15 pmSOF - DEN
2 stops34h 57mLufthansa
Deal found 10/28$681
This FlightHub deal was found by Cheapflights users on 10/28. 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.
Mon 12/85:35 pmDEN - SOF
2 stops15h 45mLufthansa
Tue 1/62:15 pmSOF - DEN
2 stops34h 57mLufthansa
Deal found 10/28$684
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/288:20 pmDEN - SOF
1 stop34h 50mTurkish Airlines
Sat 11/89:35 amSOF - DEN
1 stop17h 00mTurkish Airlines
Deal found 10/26$699
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.
Wed 10/295:20 pmDEN - SOF
1 stop17h 00mLufthansa
Tue 11/116:00 amSOF - DEN
1 stop19h 00mLufthansa
Deal found 10/27$738
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.
Mon 11/34:20 pmDEN - SOF
1 stop17h 00mLufthansa
Wed 11/126:05 amSOF - DEN
1 stop17h 30mLufthansa
Deal found 10/27$739

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver to Sofia 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 Denver to Sofia that are best for you.

Fly from

Denver

Fly to

Sofia

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 11/18

9:35 am-1:15 pm

2 stops18h 40m

Sofia

Thu 11/27

6:00 am-4:00 pm

1 stop19h 00m

$578

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 4/26

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

Tue 5/5

6:15 am-3:35 pm

1 stop18h 20m

$580

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 4/26

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

Wed 5/6

1:50 pm-11:50 pm

2 stops19h 00m

$589

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 4/26

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

Thu 5/7

1:50 pm-11:50 pm

2 stops19h 00m

$589

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 4/26

7:45 am-1:05 pm

2 stops20h 20m

Sofia

Fri 5/8

6:15 am-4:38 pm

2 stops43h 23m

$599

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 4/9

11:05 am-6:40 pm

2 stops22h 35m

Sofia

Thu 4/23

6:15 am-3:35 pm

1 stop18h 20m

$630

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 12/5

4:20 pm-10:45 pm

1 stop21h 25m

$500

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Compare providers for flights from Denver to Sofia

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 Denver to Sofia in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
AranGrantPrice 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 Denver-Sofia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Sofia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Denver-Sofia 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 Denver-Sofia 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 Denver to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Denver 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 Denver to Sofia

How far ahead should I book a flight from Denver to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from Denver to Sofia. Price data was last updated on October 24, 2025.

The price you pay for your flight from Denver to Sofia may vary depending on when you book. For the best chance of a lower fare, look to book 48 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, February is the cheapest month in which you can book a flight from Denver to Sofia (average of $518). Flying from Denver to Sofia in June is currently the most expensive (average of $821). 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 DEN to SOF?

Find hourly flight availability from Denver to Sofia. 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.

It’s typically best to fly out from Denver to Sofia in the evening. Doing so could potentially save you 40% on the flight price compared to flying in the morning, which is usually more expensive.

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. 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 Sofia. Reviews last updated October 28, 2025.
See what other customers who have flown with United Airlines, Turkish Airlines, and Lufthansa from Denver to Sofia have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,996 reviews

Boarding

7.7

Entertainment

7.1

Crew

8.1

Comfort

7.3

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

Entertainment

7.1

Crew

8.1

Comfort

7.3

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

Entertainment

7.1

Crew

8.1

Comfort

7.3

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

Entertainment

7.1

Crew

8.1

Comfort

7.3

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 Denver to Sofia. 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 Denver to Sofia?

    There are many flights that can get you from Denver to Sofia in 18h 40m. Fly via United Airlines to get the fastest option. Denver and Sofia are separated by a distance of 5871 mi.

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

    Our cheapest airline available from Denver to Sofia is Turkish Airlines. Our recent data shows that you can find tickets from as low as $522 on this airline. Additional options worth looking into are United Airlines and Lufthansa, starting at $656 and $672 round-trip. Turkish Airlines is currently priced 39% below the average price you’ll pay for this route.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Denver to Sofia 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 Denver to Sofia?

    Currently, February is the cheapest month in which you can book a flight from Denver to Sofia (average of $518). Flying from Denver to Sofia in June is currently the most expensive (average of $821). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Denver to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
Grand Junction to Sofia flights

Top 3 airlines flying from Denver to Sofia

Discover the top 3 airlines that operate flights from Denver to Sofia. 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$522Average$631FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$656Average$870FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$672Average$1,144FlexibilityNo cancel feeOn-time76%

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