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$515+ 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
Dec 29 — Jan 51
Mon 12/29
Mon 1/5
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 November 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$553
(Lufthansa)

One-way from

$515
(FlightHub)

Popular in

July

Cheapest in

April

Average price

$600
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. 24% potential increase in price ($273 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 November 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 November 29, 2025.

This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2811:15 amDEN - SOF
2 stops27h 10mMultiple Airlines
Thu 12/115:45 amSOF - DEN
2 stops23h 10mMultiple Airlines
Deal found 11/27$963
This Ovago 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:20 pmDEN - SOF
1 stop17h 25mLufthansa
Tue 1/62:00 pmSOF - DEN
1 stop33h 35mLufthansa
Deal found 11/27$1,137
This Ovago 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/98:20 pmDEN - SOF
2 stops17h 25mLufthansa
Tue 1/62:00 pmSOF - DEN
1 stop33h 35mLufthansa
Deal found 11/27$1,168
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/95:45 pmDEN - SOF
1 stop20h 00mMultiple Airlines
Tue 1/66:45 pmSOF - DEN
2 stops52h 40mMultiple Airlines
Deal found 11/28$1,207
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:20 pmDEN - SOF
2 stops30h 30mAustrian Airlines
Tue 1/66:45 pmSOF - DEN
2 stops32h 12mAustrian Airlines
Deal found 11/27$1,210

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 November 29, 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

Grand JunctionSofia

GJT - SOF

GJTSOF

Grand Junction Regnl

Wed 1/21

1:38 pm-1:50 pm

2 stops15h 12m

Sofia

Sun 1/25

2:00 pm-8:38 pm

2 stops39h 38m

$553

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 5/17

8:25 pm-8:15 pm

1 stop14h 50m

Sofia

Sat 5/23

9:05 pm-6:20 pm

1 stop30h 15m

$609

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 1/11

5:45 pm-10:45 pm

1 stop20h 00m

Sofia

Sun 1/18

6:10 am-4:40 pm

2 stops19h 30m

$725

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 1/21

4:20 pm-6:20 pm

1 stop17h 00m

Sofia

Sun 1/25

6:10 am-7:26 pm

2 stops22h 16m

$738

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 1/21

1:30 pm-6:20 pm

2 stops19h 50m

Sofia

Sun 1/25

2:25 pm-10:23 am

2 stops28h 58m

$739

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 1/11

3:55 pm-10:45 pm

1 stop21h 50m

Sofia

Sun 1/18

7:05 pm-2:35 pm

1 stop28h 30m

$753

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Thu 1/22

4:20 pm-3:15 pm

2 stops37h 55m

Varna

Mon 1/26

4:00 pm-1:40 pm

2 stops30h 40m

$785

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 5/28

8:25 pm-3:00 pm

1 stop33h 35m

Sofia

Sun 6/7

9:35 am-6:20 pm

1 stop17h 45m

$789

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 12/5

4:20 pm-10:45 pm

1 stop21h 25m

$515

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 12/5

5:35 pm-10:15 am

2 stops31h 40m

$569

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/28

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 December is currently the most expensive (average of $822). 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 November 29, 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 14h 50m. Lufthansa provides one of the quickest options available for as low as $609. 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 December is currently the most expensive (average of $822). 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 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 November 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$522Average$623FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$616Average$1,096FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$656Average$870FlexibilityNo cancel feeOn-time69%

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