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$880+ Cheap flights from Bulgaria to Denver (DEN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/18. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Jul 20 — Jul 271
Mon 7/20
Mon 7/27
1 adult, Economy
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Cheap flight deals from Bulgaria to Denver

Cheapest flights from Bulgaria to Denver
Explore the most affordable flight options available from Bulgaria to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 20, 2026.

This Booking.com deal was found by Cheapflights users on 6/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/183:50 pm
SOF
-
DEN
1 stop35h 35m
Turkish Airlines
Sat 7/258:25 pm
DEN
-
SOF
1 stop33h 35m
Turkish Airlines
Deal found 6/16$880
This oojo deal was found by Cheapflights users on 6/19. 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 7/309:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Thu 8/68:25 pm
DEN
-
SOF
1 stop27h 20m
Turkish Airlines
Deal found 6/19$890
This Turkish Airlines deal was found by Cheapflights users on 6/18. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:35 am
SOF
-
DEN
1 stop17h 50m
Multiple Airlines
Thu 8/61:59 pm
DEN
-
SOF
2 stops21h 21m
Multiple Airlines
Deal found 6/18$972
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Thu 7/306:10 am
SOF
-
DEN
2 stops21h 13m
United Airlines
Thu 8/69:35 am
DEN
-
SOF
2 stops17h 35m
United Airlines
Deal found 6/18$980
This Orbitz deal was found by Cheapflights users on 6/19. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/306:10 am
SOF
-
DEN
2 stops27h 20m
Lufthansa
Thu 8/68:25 pm
DEN
-
SOF
1 stop17h 50m
Lufthansa
Deal found 6/19$985
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:10 am
SOF
-
DEN
2 stops23h 12m
United Airlines
Sat 7/258:25 pm
DEN
-
SOF
1 stop13h 15m
United Airlines
Deal found 6/16$1,012
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:10 am
SOF
-
DEN
1 stop16h 35m
Multiple Airlines
Sat 7/258:25 pm
DEN
-
SOF
2 stops18h 30m
Multiple Airlines
Deal found 6/16$1,029

Find flight deals from Bulgaria to Denver

Keep the following information in mind while searching for Bulgaria to Denver flight deals. Data was last updated June 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$880
(Booking.com)

Popular in

June

Cheapest in

September

Average price

$1,179
Provider with most accurate pricing for Sofia-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Denver Intl flights.
Search Deals
From Bulgaria to Denver Intl
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Bulgaria to Denver 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 June 20, 2026.
Use the filters below to find and compare flights from Bulgaria to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 7/30

9:35 am-6:25 pm

1 stop17h 50m

Denver Intl

Thu 8/6

8:25 pm-8:45 am

1 stop27h 20m

$897

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 7/30

9:35 am-6:25 pm

1 stop17h 50m

Denver Intl

Thu 8/6

1:59 pm-8:20 pm

2 stops21h 21m

$972

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 7/30

6:10 am-6:23 pm

2 stops21h 13m

Denver Intl

Thu 8/6

9:35 am-12:10 pm

2 stops17h 35m

$980

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 7/30

6:10 am-12:30 am

2 stops27h 20m

Denver Intl

Thu 8/6

8:25 pm-11:15 pm

1 stop17h 50m

$985

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 7/18

6:10 am-8:22 pm

2 stops23h 12m

Denver Intl

Sat 7/25

8:25 pm-6:40 pm

1 stop13h 15m

$1,012
Quickest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 7/18

6:10 am-1:45 pm

1 stop16h 35m

Denver Intl

Sat 7/25

8:25 pm-11:55 pm

2 stops18h 30m

$1,029

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 7/18

8:00 am-6:50 pm

2 stops19h 50m

Denver Intl

Sat 7/25

8:25 pm-12:55 pm

2 stops31h 30m

$1,107

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/18

Sorted by cheapest first

Best time to book a flight from Bulgaria to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Bulgaria 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 Bulgaria to Denver
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated June 20, 2026.
See what other customers who have flown with Turkish Airlines,United Airlines, andLufthansa from Bulgaria to Denver have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Turkish Airlines
7.4
Good
4,410 reviews

Overall

7.4

Crew

7.8

Food

7.5

Entertainment

7.5

Boarding

7.3

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
Turkish Airlines
7.4
Good
4,410 reviews
Turkish Airlines
7.4
Good
4,410 reviews

Overall

7.4

Crew

7.8

Food

7.5

Entertainment

7.5

Boarding

7.3

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
United Airlines
7.4
Good
9,864 reviews
Turkish Airlines
7.4
Good
4,410 reviews

Overall

7.4

Crew

7.8

Food

7.5

Entertainment

7.5

Boarding

7.3

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
Lufthansa
6.8
Okay
8,082 reviews
Turkish Airlines
7.4
Good
4,410 reviews

Overall

7.4

Crew

7.8

Food

7.5

Entertainment

7.5

Boarding

7.3

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you

Related info for your journey

Find useful and relevant information for your journey from Bulgaria to Denver. 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 into for flights to Denver from Bulgaria?

    Denver Intl (DEN), located 18.5 mi from the city center, is the airport you fly into when you book flights from Bulgaria to Denver.

  • How long is the flight from Bulgaria to Denver?

    Turkish Airlines, United Airlines, and Lufthansa can get you from Bulgaria to Denver in just under 17h 50m. Your travel time can differ by up to 9h 30m. There are 5871 mi between Bulgaria and Denver. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from Bulgaria to Denver are Turkish Airlines ($753), Lufthansa ($821), and United Airlines ($845).

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Bulgaria to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Thornton
Black Hawk
Centennial
Westminster
Lakewood
Broomfield
Golden
Greeley
Fort Morgan
Lone Tree
Wheat Ridge
Silverthorne
Central City
Cripple Creek
Winter Park
Manitou Springs
Frisco
Englewood
Glendale
Evergreen

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Top 3 airlines flying from Bulgaria to Denver

Discover the top 3 airlines that operate flights from Bulgaria to Denver. 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 June 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$701Average$860FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$785Average$926FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$810Average$989FlexibilityNo cancel feeOn-time76%

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