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Sofia

$282+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
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 September 14, 2025.

Round-trip from

$558
(British Airways)

One-way from

$282
(Kiwi.com)

Popular in

May

Cheapest in

April

Average price

$645
From Denver Intl to Sofia
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One-way flight from Denver Intl to Sofia
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Highest demand for flights based on searches. 11% potential increase in price ($110 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 14, 2025.

This British Airways deal was found by Cheapflights users on 9/14. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/266:25 pmDEN - SOF
1 stop13h 55mBritish Airways
Mon 11/105:25 pmSOF - DEN
1 stop31h 05mBritish Airways
Deal found 9/14$558
This FlightHub deal was found by Cheapflights users on 9/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/288:20 pmDEN - SOF
1 stop28h 55mTurkish Airlines
Sat 11/810:05 amSOF - DEN
1 stop16h 30mTurkish Airlines
Deal found 9/12$575
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2812:29 pmDEN - SOF
2 stops23h 41mAmerican Airlines
Mon 11/105:25 pmSOF - DEN
2 stops35h 52mAmerican Airlines
Deal found 9/13$581
This American Airlines deal was found by Cheapflights users on 9/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/34:51 pmDEN - SOF
2 stops42h 19mAmerican Airlines
Wed 11/129:00 pmSOF - DEN
2 stops32h 13mAmerican Airlines
Deal found 9/12$586
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/55:25 pmDEN - SOF
2 stops15h 55mLufthansa
Wed 11/126:10 amSOF - DEN
1 stop18h 50mLufthansa
Deal found 9/12$591
This Ovago deal was found by Cheapflights users on 9/13. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:25 pmDEN - SOF
1 stop17h 45mBritish Airways
Mon 11/105:25 pmSOF - DEN
1 stop31h 05mBritish Airways
Deal found 9/13$593
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/44:20 pmDEN - SOF
1 stop17h 00mLufthansa
Thu 11/132:35 pmSOF - DEN
2 stops17h 40mLufthansa
Deal found 9/13$594
This oojo deal was found by Cheapflights users on 9/12. 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 10/308:20 pmDEN - SOF
1 stop28h 55mTurkish Airlines
Mon 11/109:40 pmSOF - DEN
1 stop28h 55mTurkish Airlines
Deal found 9/12$598

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 September 14, 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 10/28

6:25 pm-8:10 pm

1 stop17h 45m

Sofia

Mon 11/10

5:25 pm-3:30 pm

1 stop31h 05m

$558

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 10/26

6:25 pm-4:20 pm

1 stop13h 55m

Sofia

Sun 11/9

2:30 pm-3:30 pm

1 stop34h 00m

$608

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 10/30

6:25 pm-11:15 am

1 stop32h 50m

Sofia

Wed 11/5

9:00 pm-3:30 pm

1 stop27h 30m

$608

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 10/28

6:25 pm-8:10 pm

1 stop17h 45m

Sofia

Sun 11/9

2:30 pm-3:30 pm

1 stop34h 00m

$618

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 10/29

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Thu 11/6

6:00 am-7:55 pm

2 stops22h 55m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 10/28

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Thu 11/27

6:00 am-4:00 pm

1 stop19h 00m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 10/27

5:20 pm-6:20 pm

1 stop17h 00m

Sofia

Tue 11/11

6:00 am-1:40 pm

1 stop16h 40m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 11/4

8:20 pm-6:20 pm

1 stop13h 00m

Sofia

Thu 11/13

6:00 am-7:55 pm

2 stops22h 55m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 10/29

9:20 pm-10:45 pm

1 stop17h 25m

Sofia

Tue 11/11

6:00 am-4:00 pm

1 stop19h 00m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 10/27

9:20 pm-10:45 pm

1 stop17h 25m

Sofia

Wed 11/5

6:10 am-7:55 pm

2 stops22h 45m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 21 results
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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 September 12, 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, November is the cheapest month in which you can book a flight from Denver to Sofia (average of $632). Flying from Denver to Sofia in June is currently the most expensive (average of $1,185). 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 September 14, 2025.

It’s typically best to fly out from Denver to Sofia in the evening. Doing so could potentially save you 41% 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 September 14, 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
8,931 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,931 reviews
United Airlines
7.4
Good
8,931 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Turkish Airlines
7.3
Good
3,968 reviews
United Airlines
7.4
Good
8,931 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,409 reviews
United Airlines
7.4
Good
8,931 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 17h 45m. Fly via British Airways 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 $522 on this airline. Additional options worth looking into are Lufthansa and United Airlines, starting at $646 and $674 round-trip. Turkish Airlines is currently priced 41% 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, November is the cheapest month in which you can book a flight from Denver to Sofia (average of $632). Flying from Denver to Sofia in June is currently the most expensive (average of $1,185). 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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$522Average$645FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$646Average$1,183FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$674Average$870FlexibilityNo cancel feeOn-time69%

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