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$709+ Cheap flights from Bulgaria to Colorado

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 12/29. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Dec 29 — Jan 51
Mon 12/29
Mon 1/5
1 adult, Economy
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Find 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 November 29, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 11/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:05 amSOF - DEN
1 stop17h 30mLufthansa
Tue 3/318:20 pmDEN - SOF
1 stop13h 20mLufthansa
Deal found 11/28$901
This United Airlines deal was found by Cheapflights users on 11/28. 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 12/186:00 amSOF - DEN
2 stops26h 38mUnited Airlines
Tue 3/318:20 pmDEN - SOF
1 stop13h 20mUnited Airlines
Deal found 11/28$902
This FlightHub deal was found by Cheapflights users on 11/27. 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.
Thu 12/189:35 amSOF - DEN
1 stop17h 00mTurkish Airlines
Tue 3/318:25 pmDEN - SOF
1 stop14h 50mTurkish Airlines
Deal found 11/27$965
This oojo deal was found by Cheapflights users on 11/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/209:40 pmSOF - DEN
2 stops33h 26mTurkish Airlines
Tue 3/318:25 pmDEN - SOF
1 stop14h 50mTurkish Airlines
Deal found 11/27$1,084
This FlightHub deal was found by Cheapflights users on 11/29. 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.
Sat 12/207:05 pmSOF - DEN
1 stop32h 50mLufthansa
Tue 3/318:20 pmDEN - SOF
1 stop17h 50mLufthansa
Deal found 11/29$1,191
This United Airlines deal was found by Cheapflights users on 11/27. 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.
Sat 12/202:25 pmSOF - DEN
2 stops36h 38mUnited Airlines
Tue 3/313:20 pmDEN - SOF
2 stops18h 20mUnited Airlines
Deal found 11/27$1,193
This Trip.com deal was found by Cheapflights users on 11/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2012:05 pmSOF - DEN
1 stop36h 25mBritish Airways
Tue 3/316:40 pmDEN - SOF
1 stop17h 00mBritish Airways
Deal found 11/27$1,196

Cheap flight deals from Bulgaria to Colorado

Keep the following information in mind while searching for Bulgaria to Colorado flight deals. Data was last updated November 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$772
(Expedia)

One-way from

$709
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$842
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
One-way flight from Bulgaria to Colorado
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($35 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
Average for round-trip flights in November 2025
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 November 29, 2025.
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

Mon 5/25

6:20 am-3:35 pm

1 stop18h 15m

Denver Intl

Mon 6/1

5:45 pm-10:05 am

1 stop31h 20m

$772

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 2/21

6:25 am-1:40 pm

1 stop16h 15m

Denver Intl

Sat 2/28

8:20 pm-10:45 pm

1 stop17h 25m

$774

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 2/21

6:25 am-1:40 pm

1 stop16h 15m

Denver Intl

Sun 3/1

3:20 pm-6:20 pm

2 stops18h 00m

$774

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 2/21

6:25 am-1:40 pm

1 stop16h 15m

Denver Intl

Sun 3/1

8:20 pm-6:20 pm

1 stop13h 00m

$774

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 2/21

6:25 am-1:40 pm

1 stop16h 15m

Denver Intl

Sat 2/28

11:15 am-1:15 pm

2 stops17h 00m

$774

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 2/22

6:10 am-4:00 pm

1 stop18h 50m

Denver Intl

Sat 2/28

11:15 am-1:15 pm

2 stops17h 00m

$775

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 2/22

6:10 am-4:00 pm

1 stop18h 50m

Denver Intl

Sun 3/1

5:45 pm-6:00 pm

1 stop15h 15m

$775

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 2/22

6:10 am-4:00 pm

1 stop18h 50m

Denver Intl

Sun 3/1

9:36 am-1:35 pm

2 stops18h 59m

$775

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 1/15

6:00 am-1:40 pm

1 stop16h 40m

Denver Intl

Mon 1/19

11:15 am-1:25 pm

2 stops17h 10m

$775

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/25

6:20 am-3:35 pm

1 stop18h 15m

Denver Intl

Mon 6/1

5:40 pm-1:15 pm

2 stops34h 35m

$776

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/27

Showing 1-10 of 23 results
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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

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

Currently, December is the cheapest month in which you can book a flight from Bulgaria to Colorado (average of $714). Flying from Bulgaria to Colorado in August is currently the most expensive (average of $834). 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 BG to CO?

Find hourly flight availability from Bulgaria to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 29, 2025.

One of the essential ways to save on airfare from Bulgaria to Colorado is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 24% on airfare.

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 November 29, 2025.
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
9,056 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,056 reviews
United Airlines
7.4
Good
9,056 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Turkish Airlines
7.3
Good
4,069 reviews
United Airlines
7.4
Good
9,056 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Lufthansa
6.8
Okay
7,598 reviews
United Airlines
7.4
Good
9,056 reviews

Entertainment

7.1

Comfort

7.3

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

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?

    Lufthansa and United Airlines can get you from Bulgaria to Colorado in just under 16h 15m. Your travel time can differ by up to . There are 5871 mi between Bulgaria and Colorado.

  • 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.

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

    Currently, December is the cheapest month in which you can book a flight from Bulgaria to Colorado (average of $714). Flying from Bulgaria to Colorado in August is currently the most expensive (average of $834). 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

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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 November 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$803FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$792FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$745Average$989FlexibilityNo cancel feeOn-time76%

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