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Sofia

$297+ 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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
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 March 17, 2026.

This oojo deal was found by Cheapflights users on 3/14. 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.
Sat 4/188:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Sat 4/259:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Deal found 3/14$596
This oojo deal was found by Cheapflights users on 3/12. 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 4/28:25 pm
DEN
-
SOF
1 stop26h 50m
Turkish Airlines
Mon 4/139:35 pm
SOF
-
DEN
1 stop29h 50m
Turkish Airlines
Deal found 3/12$597
This oojo deal was found by Cheapflights users on 3/16. 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 4/308:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Thu 5/79:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Deal found 3/16$617
This SmartFares deal was found by Cheapflights users on 3/15. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Tue 10/2710:05 am
SOF
-
DEN
1 stop16h 30m
Turkish Airlines
Deal found 3/15$630
This FlightHub deal was found by Cheapflights users on 3/14. 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.
Wed 12/94:20 pm
DEN
-
SOF
1 stop17h 00m
Lufthansa
Fri 1/156:10 am
SOF
-
DEN
1 stop18h 50m
Lufthansa
Deal found 3/14$636
This United Airlines deal was found by Cheapflights users on 3/14. 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 12/74:20 pm
DEN
-
SOF
1 stop17h 00m
United Airlines
Wed 1/136:10 am
SOF
-
DEN
1 stop18h 50m
United Airlines
Deal found 3/14$637
This United Airlines deal was found by Cheapflights users on 3/14. 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 12/74:20 pm
DEN
-
SOF
1 stop21h 25m
United Airlines
Fri 1/156:10 am
SOF
-
DEN
2 stops22h 45m
United Airlines
Deal found 3/14$640
This United Airlines deal was found by Cheapflights users on 3/14. 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 12/75:42 pm
DEN
-
SOF
2 stops20h 03m
United Airlines
Tue 1/126:10 am
SOF
-
DEN
1 stop18h 50m
United Airlines
Deal found 3/14$642
This United Airlines deal was found by Cheapflights users on 3/14. 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 12/74:20 pm
DEN
-
SOF
1 stop21h 25m
United Airlines
Mon 1/111:55 pm
SOF
-
DEN
1 stop33h 40m
United Airlines
Deal found 3/14$649
This Air Canada deal was found by Cheapflights users on 3/14. 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 12/78:05 am
DEN
-
SOF
2 stops20h 40m
Air Canada
Tue 1/126:00 am
SOF
-
DEN
2 stops43h 28m
Air Canada
Deal found 3/14$650
This Air Canada deal was found by Cheapflights users on 3/14. 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 12/78:05 am
DEN
-
SOF
2 stops20h 40m
Air Canada
Thu 1/146:10 am
SOF
-
DEN
2 stops22h 45m
Air Canada
Deal found 3/14$652
This Air Canada deal was found by Cheapflights users on 3/14. 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.
Tue 12/811:15 am
DEN
-
SOF
2 stops22h 00m
Air Canada
Fri 1/156:10 am
SOF
-
DEN
2 stops20h 34m
Air Canada
Deal found 3/14$653

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 March 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$596
(oojo)

One-way from

$297
(Air France)

Popular in

December

Cheapest in

November

Average price

$627
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. 4% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 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 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 March 17, 2026.
Use the filters below to find and compare flights from Denver to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 4/13

4:05 pm-11:00 pm

1 stop21h 55m

Sofia

Mon 4/20

12:55 pm-2:20 pm

1 stop34h 25m

$707

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 4/13

7:45 am-11:00 pm

2 stops30h 15m

Sofia

Mon 4/20

12:55 pm-2:20 pm

1 stop34h 25m

$713

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 4/30

4:05 pm-6:40 pm

1 stop17h 35m

Sofia

Thu 5/7

6:30 am-5:00 pm

2 stops19h 30m

$722

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 4/1

11:15 am-12:10 pm

2 stops15h 55m

Sofia

Fri 4/10

6:20 am-3:40 pm

1 stop18h 20m

$804

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 5/5

3:52 pm-6:40 pm

2 stops17h 48m

Sofia

Wed 7/1

6:20 am-10:35 am

2 stops37h 15m

$834

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 8/1

9:05 pm-11:00 pm

2 stops40h 55m

Sofia

Sat 8/8

6:20 am-9:27 pm

2 stops24h 07m

$851
Quickest round-trip

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 6/3

3:55 pm-6:05 pm

1 stop17h 10m

Sofia

Wed 6/17

12:55 pm-6:50 pm

1 stop14h 55m

$865
Cheapest one-way

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 9/7

4:15 pm-11:00 pm

1 stop21h 45m

$298

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 9/7

5:00 am-11:00 pm

2 stops33h 00m

$304

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 4/15

11:40 am-12:20 am

3 stops27h 40m

$333

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Showing 1-10 of 14 resultsSorted by cheapest first
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 March.
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
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 March 13, 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 42 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 $497). 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.

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 March 17, 2026.
See what other customers who have flown with United Airlines,Turkish Airlines, andLufthansa 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
9,429 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

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
9,429 reviews
United Airlines
7.4
Good
9,429 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

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
4,256 reviews
United Airlines
7.4
Good
9,429 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

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
7,854 reviews
United Airlines
7.4
Good
9,429 reviews

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

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 21h 55m. Fly via Turkish Airlines, 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 $568 on this airline. Additional options worth looking into are Lufthansa and United Airlines, starting at $577 and $686 round-trip. Turkish Airlines is currently priced 26% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Denver to Sofia one-way?

    The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as $222. However, be on the lookout for offers from United Airlines and Turkish Airlines, as they are both options that can get you from Denver to Sofia for a low price.

  • 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 $497). 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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Complete your trip

Complete your trip to Sofia by adding a car rental and/or hotel reservation to your travel itinerary.
Sofia car rentals
Sofia Airport car rentals
Plovdiv Airport car rentals

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 March 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$568Average$647FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$577Average$926FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$686Average$933FlexibilityNo cancel feeOn-time69%

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