HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bulgaria

$284+ Cheap flights from Denver (DEN) to Bulgaria

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
févr. 28 — mars 71
sam. 2/28
sam. 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Denver to Bulgaria with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Denver to Bulgaria

Cheapest flights from Denver to Bulgaria
Explore the most affordable flight options available from Denver to Bulgaria. Find the lowest fares from popular airlines and budget airlines, with prices last updated on janvier 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.
mar. 4/286:40 pm
DEN
-
SOF
1 stop16h 50m
British Airways
mer. 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.
lun. 4/274:05 pm
DEN
-
SOF
1 stop22h 05m
Lufthansa
jeu. 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.
mer. 4/294:05 pm
DEN
-
SOF
1 stop22h 05m
Lufthansa
ven. 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.
mar. 4/285:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
jeu. 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.
lun. 4/278:25 pm
DEN
-
SOF
1 stop17h 45m
United Airlines
ven. 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.
mar. 4/284:15 pm
DEN
-
SOF
2 stops21h 55m
United Airlines
jeu. 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.
lun. 5/411:35 am
DEN
-
SOF
2 stops15h 35m
United Airlines
mer. 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.
mar. 4/285:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
ven. 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.
lun. 5/411:35 am
DEN
-
SOF
2 stops15h 35m
Air Canada
mer. 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.
lun. 5/45:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
mer. 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.
mer. 4/2911:05 am
DEN
-
SOF
2 stops17h 20m
United Airlines
jeu. 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.
dim. 5/35:40 pm
DEN
-
SOF
1 stop15h 30m
Lufthansa
mer. 5/611:50 am
SOF
-
DEN
2 stops20h 40m
Lufthansa
Deal found 1/27$546

Find flight deals from Denver to Bulgaria

Keep the following information in mind while searching for Denver to Bulgaria flight deals. Data was last updated janvier 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 Bulgaria
Search Deals
One-way flight from Denver Intl to Bulgaria
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 Bulgaria 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 janvier 29, 2026.
Use the filters below to find and compare flights from Denver to Bulgaria that are best for you.

Fly from

Denver

Fly to

Bulgaria

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

mar. 4/28

6:40 pm-8:30 pm

1 stop16h 50m

Sofia

mer. 5/6

9:25 pm-4:30 pm

1 stop28h 05m

$516

DenverSofia

DEN - SOF

DENSOF

Denver Intl

lun. 4/27

4:05 pm-11:10 pm

1 stop22h 05m

Sofia

ven. 5/8

6:20 am-3:40 pm

1 stop18h 20m

$519

DenverSofia

DEN - SOF

DENSOF

Denver Intl

lun. 4/27

8:25 pm-11:10 pm

1 stop17h 45m

Sofia

jeu. 5/7

6:30 am-7:00 pm

2 stops21h 30m

$522

DenverSofia

DEN - SOF

DENSOF

Denver Intl

lun. 4/27

8:25 pm-11:10 pm

1 stop17h 45m

Sofia

mer. 5/6

6:20 am-7:00 pm

2 stops21h 40m

$522

DenverSofia

DEN - SOF

DENSOF

Denver Intl

lun. 5/4

11:35 am-12:10 pm

2 stops15h 35m

Sofia

mer. 5/6

6:20 am-3:40 pm

1 stop18h 20m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

sam. 5/2

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

jeu. 5/7

6:30 am-3:40 pm

1 stop18h 10m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

lun. 5/4

11:35 am-12:10 pm

2 stops15h 35m

Sofia

jeu. 5/7

6:30 am-3:40 pm

1 stop18h 10m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

mar. 4/28

4:15 pm-11:10 pm

2 stops21h 55m

Sofia

jeu. 5/7

6:30 am-7:00 pm

2 stops21h 30m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

dim. 5/3

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

jeu. 5/7

6:30 am-3:40 pm

1 stop18h 10m

$527

DenverSofia

DEN - SOF

DENSOF

Denver Intl

lun. 5/4

11:35 am-12:10 pm

2 stops15h 35m

Sofia

ven. 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 19 results
1
2

Best time to book a flight from Denver to Bulgaria

Have a flexible travel schedule? Discover the best time to fly to Bulgaria 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 Bulgaria

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

Currently, August is the cheapest month in which you can book a flight from Denver to Bulgaria (average of $514). Flying from Denver to Bulgaria 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 Bulgaria

Get insights into the airlines that provide service to Bulgaria. 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 Bulgaria. Reviews last updated janvier 29, 2026.
Read through reviews of airlines operating flights from Denver to Bulgaria, such as United Airlines, Turkish Airlines, and Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,215 reviews

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

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

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

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

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

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

Comfort

7.3

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

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 Bulgaria. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Denver to Bulgaria?

    For a flight from Denver to Bulgaria, you will be flying from Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

  • How long is the flight from Denver to Bulgaria?

    British Airways, Lufthansa, and United Airlines can get you from Denver to Bulgaria in just under 16h 50m. Your travel time can differ by up to 5h 15m. The distance from Denver to Bulgaria is about 5871 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Denver to Bulgaria (average of $514). Flying from Denver to Bulgaria 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Denver to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Heathrow flights
Denver to Leonardo da Vinci/Fiumicino flights
Denver to Dublin flights
Denver to Gatwick flights
Denver to Charles de Gaulle flights
Denver to Frankfurt flights
Denver to London City flights
Denver to Orly flights
Denver to Barcelona-El Prat flights
Denver to Stansted flights
Denver to Istanbul flights
Denver to Athens flights
Denver to Munich flights
Denver to Lisbon flights
Denver to Malpensa flights
Denver to Madrid flights
Denver to Amsterdam flights
Denver to Linate flights
Denver to Vicenza flights
Denver to Sabiha Gokcen flights
Denver to Keflavik Intl flights
Denver to Zurich flights
Denver to Florence flights
Denver to Edinburgh flights
Denver to Geneva flights
Denver to Oslo Gardermoen flights
Denver to Luton flights
Denver to Copenhagen flights
Denver to Naples flights
Denver to Budapest flights
Denver to Glasgow Intl flights
Denver to Prague flights
Denver to Arlanda flights
Denver to Porto flights
Denver to Berlin flights
Denver to Bruxelles-National flights
Denver to Frederic Chopin flights
Denver to Basel flights
Denver to Dubrovnik flights
Denver to Bologna flights
Denver to Split flights
Denver to Faro flights
Denver to Nice flights
Denver to Shannon flights
Denver to Beauvais-Tille flights
Denver to Krakow flights
Denver to Pisa flights
Denver to Málaga flights

Top 3 airlines flying from Denver to Bulgaria

Discover the top 3 airlines that operate flights from Denver to Bulgaria. 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 janvier 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$535Average$774FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$634Average$1,042FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$686Average$1,007FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.