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$859+ Cheap flights from Bulgaria to Colorado

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 6/23. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Cheap flight deals from Bulgaria to Colorado

Cheapest flights from Bulgaria to Colorado
Explore the most affordable flight options available from Bulgaria to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2026.

This oojo deal was found by Cheapflights users on 1/20. 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.
Tue 6/239:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Tue 7/218:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Deal found 1/20$859
This Orbitz deal was found by Cheapflights users on 1/21. 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.
Sun 2/156:10 am
SOF
-
DEN
1 stop16h 30m
Lufthansa
Sat 2/218:20 pm
DEN
-
SOF
1 stop17h 25m
Lufthansa
Deal found 1/21$860
This Air Canada deal was found by Cheapflights users on 1/20. 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 6/232:10 pm
SOF
-
DEN
2 stops29h 23m
Air Canada
Tue 7/219:40 am
DEN
-
SOF
2 stops18h 25m
Air Canada
Deal found 1/20$863
This United Airlines deal was found by Cheapflights users on 1/21. 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.
Sun 2/156:10 am
SOF
-
DEN
1 stop16h 30m
United Airlines
Sat 2/2111:15 am
DEN
-
SOF
2 stops17h 00m
United Airlines
Deal found 1/21$865
This United Airlines deal was found by Cheapflights users on 1/21. 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 3/146:25 am
SOF
-
DEN
1 stop16h 15m
United Airlines
Sat 3/211:40 pm
DEN
-
SOF
2 stops16h 00m
United Airlines
Deal found 1/21$866
This United Airlines deal was found by Cheapflights users on 1/20. 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 6/236:10 am
SOF
-
DEN
1 stop16h 35m
United Airlines
Tue 7/219:40 am
DEN
-
SOF
2 stops18h 25m
United Airlines
Deal found 1/20$876
This Expedia deal was found by Cheapflights users on 1/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:25 am
SOF
-
DEN
1 stop16h 15m
Lufthansa
Sat 3/219:20 pm
DEN
-
SOF
1 stop13h 00m
Lufthansa
Deal found 1/21$965

Find flight deals from Bulgaria to Colorado

Keep the following information in mind while searching for Bulgaria to Colorado flight deals. Data was last updated January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$859
(oojo)

Popular in

May

Cheapest in

February
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 Colorado
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Bulgaria to Colorado 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 21, 2026.
Use the filters below to find and compare flights from Bulgaria to Colorado that are best for you.

Fly from

Bulgaria

Fly to

Colorado

Route

Depart

Return

Price

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 6/23

9:35 am-6:25 pm

1 stop17h 50m

Denver Intl

Tue 7/21

8:25 pm-8:15 pm

1 stop14h 50m

$859

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 2/15

6:10 am-1:40 pm

1 stop16h 30m

Denver Intl

Sat 2/21

8:20 pm-10:45 pm

1 stop17h 25m

$860

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 6/23

2:10 pm-10:33 am

2 stops29h 23m

Denver Intl

Tue 7/21

9:40 am-1:05 pm

2 stops18h 25m

$863

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 2/15

6:10 am-1:40 pm

1 stop16h 30m

Denver Intl

Sat 2/21

11:15 am-1:15 pm

2 stops17h 00m

$865

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 3/14

6:25 am-2:40 pm

1 stop16h 15m

Denver Intl

Fri 3/20

1:40 pm-1:35 pm

2 stops15h 55m

$866

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 3/14

6:25 am-2:40 pm

1 stop16h 15m

Denver Intl

Sat 3/21

1:40 pm-1:40 pm

2 stops16h 00m

$866

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 6/23

6:10 am-1:45 pm

1 stop16h 35m

Denver Intl

Tue 7/21

9:40 am-1:05 pm

2 stops18h 25m

$876

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Best time to book a flight from Bulgaria to Colorado

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

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. 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 Colorado. Reviews last updated January 21, 2026.
Read reviews from past customers who have flown United Airlines, Turkish Airlines, and Lufthansa from Bulgaria to Colorado. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,191 reviews

Crew

8.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
9,191 reviews
United Airlines
7.4
Good
9,191 reviews

Crew

8.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
4,200 reviews
United Airlines
7.4
Good
9,191 reviews

Crew

8.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
7,738 reviews
United Airlines
7.4
Good
9,191 reviews

Crew

8.1

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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 Bulgaria to Colorado. 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 Bulgaria to Colorado?

    Turkish Airlines, Lufthansa, and Air Canada can get you from Bulgaria to Colorado in just under 16h 30m. Your travel time can differ by up to 12h 53m. There are 5871 mi between Bulgaria and Colorado. Both multi-stop and nonstop flights can be found to your destination and back.

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

    To fly one-way, consider booking your trip with Turkish Airlines, which is currently one of the cheapest options available, starting at $736. Lufthansa flights start at $756 while deals on United Airlines start at $845 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Bulgaria to Colorado 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

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Alternative routes for Bulgaria to Colorado

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Top 3 airlines flying from Bulgaria to Colorado

Discover the top 3 airlines that operate flights from Bulgaria to Colorado. 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 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$840FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$792FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$767Average$1,013FlexibilityNo cancel feeOn-time76%

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