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Bulgaria

$500+ Cheap flights from Colorado 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Colorado to Bulgaria

Keep the following information in mind while searching for Colorado to Bulgaria flight deals. Data was last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$581
(FlightHub)

One-way from

$500
(Ovago)

Popular in

May

Cheapest in

April

Average price

$631
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
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From Colorado to Bulgaria
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One-way flight from Colorado to Bulgaria
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Highest demand for flights based on searches. 13% potential increase in price ($140 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Colorado to Bulgaria

Cheapest flights from Colorado to Bulgaria
Explore the most affordable flight options available from Colorado to Bulgaria. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Turkish Airlines deal was found by Cheapflights users on 10/29. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/187:20 pmDEN - SOF
1 stop16h 30mTurkish Airlines
Thu 11/279:35 amSOF - DEN
1 stop17h 00mTurkish Airlines
Deal found 10/29$631
This FlightHub deal was found by Cheapflights users on 10/29. 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.
Tue 12/94:20 pmDEN - SOF
1 stop21h 25mLufthansa
Tue 1/62:15 pmSOF - DEN
2 stops34h 57mLufthansa
Deal found 10/29$681
This FlightHub deal was found by Cheapflights users on 10/29. 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.
Mon 12/85:35 pmDEN - SOF
2 stops15h 45mLufthansa
Tue 1/62:15 pmSOF - DEN
2 stops34h 57mLufthansa
Deal found 10/29$684
This FlightHub deal was found by Cheapflights users on 10/30. 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.
Mon 11/34:20 pmDEN - SOF
1 stop21h 25mLufthansa
Wed 11/122:25 pmSOF - DEN
1 stop34h 35mLufthansa
Deal found 10/30$702
This oojo deal was found by Cheapflights users on 10/30. 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 12/97:20 pmDEN - SOF
1 stop16h 30mTurkish Airlines
Tue 1/69:35 amSOF - DEN
1 stop17h 00mTurkish Airlines
Deal found 10/30$720
This Cheapflightsfares deal was found by Cheapflights users on 10/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/295:20 pmDEN - SOF
1 stop21h 25mLufthansa
Tue 11/116:00 amSOF - DEN
1 stop19h 00mLufthansa
Deal found 10/29$738
This oojo deal was found by Cheapflights users on 10/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:20 pmDEN - SOF
1 stop16h 30mTurkish Airlines
Tue 11/119:35 amSOF - DEN
1 stop17h 00mTurkish Airlines
Deal found 10/29$741

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado 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 October 30, 2025.
Use the filters below to find and compare flights from Colorado to Bulgaria that are best for you.

Fly from

Colorado

Fly to

Bulgaria

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 3/23

5:20 pm-6:20 pm

1 stop17h 00m

Sofia

Mon 3/30

12:50 pm-2:20 pm

1 stop34h 30m

$582

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 3/22

6:00 am-1:00 pm

2 stops23h 00m

Sofia

Mon 3/30

12:50 pm-2:20 pm

1 stop34h 30m

$587

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 2/12

7:20 pm-8:50 pm

1 stop16h 30m

Sofia

Fri 2/20

4:00 pm-5:35 pm

1 stop34h 35m

$596

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 4/9

8:25 pm-3:00 pm

1 stop33h 35m

Sofia

Thu 4/23

9:35 am-6:20 pm

1 stop17h 45m

$599

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 3/21

8:20 pm-8:50 pm

1 stop16h 30m

Sofia

Sun 3/29

9:35 am-6:20 pm

1 stop17h 45m

$604

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 3/19

6:25 pm-11:15 am

1 stop32h 50m

Sofia

Mon 3/30

8:00 pm-4:35 pm

1 stop29h 35m

$618

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 2/12

4:20 pm-10:45 pm

1 stop21h 25m

Sofia

Fri 2/20

6:10 am-7:55 pm

2 stops22h 45m

$629

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 4/9

11:05 am-6:40 pm

2 stops22h 35m

Sofia

Thu 4/23

6:10 am-3:35 pm

1 stop18h 25m

$630

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 3/19

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Thu 3/26

6:00 am-5:00 pm

1 stop19h 00m

$630

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 3/20

5:20 pm-6:20 pm

1 stop17h 00m

Sofia

Thu 3/26

6:00 am-5:00 pm

1 stop19h 00m

$630

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 14 results
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Best time to book a flight from Colorado to Bulgaria

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

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

Currently, February is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $518). Flying from Colorado to Bulgaria in June is currently the most expensive (average of $821). 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 CO to BG?

Find hourly flight availability from Colorado to Bulgaria. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

When flying from Colorado to Bulgaria, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 21% versus a flight in the afternoon.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Bulgaria. 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 Colorado to Bulgaria?

    A quick flight from Colorado to Bulgaria can take about 16h 30m. United Airlines provides one of the quickest options available for as low as $596. Colorado and Bulgaria are separated by a distance of 5871 mi. This flight may include one or multiple stops.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $518). Flying from Colorado to Bulgaria in June is currently the most expensive (average of $821). 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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See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Colorado to Bulgaria

Discover the top 3 airlines that operate flights from Colorado 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$522Average$628FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$656Average$870FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$672Average$1,152FlexibilityNo cancel feeOn-time76%

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