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Sofia

$284+ 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 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:40 pm
DEN
-
SOF
1 stop16h 50m
British Airways
Wed 5/69:25 pm
SOF
-
DEN
1 stop28h 05m
British Airways
Deal found 1/27$516
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/274:05 pm
DEN
-
SOF
1 stop22h 05m
Lufthansa
Thu 5/76:30 am
SOF
-
DEN
1 stop18h 10m
Lufthansa
Deal found 1/27$517
This Lufthansa deal was found by Cheapflights users on 1/27. 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.
Wed 4/294:05 pm
DEN
-
SOF
1 stop22h 05m
Lufthansa
Fri 5/86:20 am
SOF
-
DEN
1 stop18h 20m
Lufthansa
Deal found 1/27$519
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
Thu 5/76:30 am
SOF
-
DEN
1 stop18h 10m
Lufthansa
Deal found 1/27$520
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:25 pm
DEN
-
SOF
1 stop17h 45m
United Airlines
Fri 5/86:20 am
SOF
-
DEN
2 stops21h 40m
United Airlines
Deal found 1/27$522
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/284:15 pm
DEN
-
SOF
2 stops21h 55m
United Airlines
Thu 5/76:30 am
SOF
-
DEN
1 stop18h 10m
United Airlines
Deal found 1/27$523
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/411:35 am
DEN
-
SOF
2 stops15h 35m
United Airlines
Wed 5/66:20 am
SOF
-
DEN
1 stop18h 20m
United Airlines
Deal found 1/27$527
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
Fri 5/86:20 am
SOF
-
DEN
1 stop18h 20m
Lufthansa
Deal found 1/27$529
This Air Canada deal was found by Cheapflights users on 1/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/411:35 am
DEN
-
SOF
2 stops15h 35m
Air Canada
Wed 5/66:20 am
SOF
-
DEN
2 stops21h 40m
Air Canada
Deal found 1/27$530
This Lufthansa deal was found by Cheapflights users on 1/27. 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.
Mon 5/45:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
Wed 5/66:20 am
SOF
-
DEN
1 stop18h 20m
Lufthansa
Deal found 1/27$531
This United Airlines deal was found by Cheapflights users on 1/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2911:05 am
DEN
-
SOF
2 stops17h 20m
United Airlines
Thu 5/76:30 am
SOF
-
DEN
1 stop18h 10m
United Airlines
Deal found 1/27$534
This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:40 pm
DEN
-
SOF
1 stop15h 30m
Lufthansa
Wed 5/611:50 am
SOF
-
DEN
2 stops20h 40m
Lufthansa
Deal found 1/27$546

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$516
(KAYAK)

One-way from

$284
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$693
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
Search Deals
From Denver Intl to Sofia
Search Deals
One-way flight from Denver Intl to Sofia
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($249 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 29, 2026.
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 4/28

6:40 pm-8:30 pm

1 stop16h 50m

Sofia

Wed 5/6

9:25 pm-4:30 pm

1 stop28h 05m

$516

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 4/27

4:05 pm-11:10 pm

1 stop22h 05m

Sofia

Fri 5/8

6:20 am-3:40 pm

1 stop18h 20m

$519

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 4/27

8:25 pm-11:10 pm

1 stop17h 45m

Sofia

Thu 5/7

6:30 am-7:00 pm

2 stops21h 30m

$522

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 4/27

8:25 pm-11:10 pm

1 stop17h 45m

Sofia

Wed 5/6

6:20 am-7:00 pm

2 stops21h 40m

$522

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/4

11:35 am-12:10 pm

2 stops15h 35m

Sofia

Wed 5/6

6:20 am-3:40 pm

1 stop18h 20m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 5/2

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

Thu 5/7

6:30 am-3:40 pm

1 stop18h 10m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/4

11:35 am-12:10 pm

2 stops15h 35m

Sofia

Thu 5/7

6:30 am-3:40 pm

1 stop18h 10m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 4/28

4:15 pm-11:10 pm

2 stops21h 55m

Sofia

Thu 5/7

6:30 am-7:00 pm

2 stops21h 30m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 5/3

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

Thu 5/7

6:30 am-3:40 pm

1 stop18h 10m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/4

11:35 am-12:10 pm

2 stops15h 35m

Sofia

Fri 5/8

6:20 am-1:35 pm

1 stop16h 15m

$527

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 16 results
1
2

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
GurufarePrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice 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 January 23, 2026.

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 51 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, August is the cheapest month in which you can book a flight from Denver to Sofia (average of $514). Flying from Denver to Sofia in December is currently the most expensive (average of $906). 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.

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

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 January 29, 2026.
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
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,215 reviews
United Airlines
7.4
Good
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Turkish Airlines
7.3
Good
4,208 reviews
United Airlines
7.4
Good
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Lufthansa
6.8
Okay
7,754 reviews
United Airlines
7.4
Good
9,215 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 16h 50m. Fly via British Airways, Lufthansa, or United Airlines to get the fastest option. Denver and Sofia are separated by a distance of 5871 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $535 on this airline. Additional options worth looking into are Lufthansa and United Airlines, starting at $634 and $686 round-trip. Turkish Airlines is currently priced 32% 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, August is the cheapest month in which you can book a flight from Denver to Sofia (average of $514). Flying from Denver to Sofia in December is currently the most expensive (average of $906). 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$535Average$635FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$634Average$1,042FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$686Average$1,007FlexibilityNo cancel feeOn-time69%

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