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Bulgaria

$546+ Cheap flights from Colorado to Bulgaria

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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheap flight deals from Colorado to Bulgaria

Best flights from Colorado to Bulgaria
Discover carefully curated flight deals from Colorado to Bulgaria that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 23, 2025.

This United Airlines deal was found by Cheapflights users on 12/20. 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.
Thu 1/225:30 amGJT - SOF
2 stops32h 15mUnited Airlines
Mon 1/266:10 amSOF - GJT
2 stops23h 28mUnited Airlines
Deal found 12/20$546
This FlightHub deal was found by Cheapflights users on 12/22. 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 4/48:25 pmDEN - SOF
1 stop14h 50mTurkish Airlines
Mon 4/133:50 pmSOF - DEN
1 stop35h 35mTurkish Airlines
Deal found 12/22$597
This Air Canada deal was found by Cheapflights users on 12/21. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/411:15 amDEN - SOF
2 stops22h 05mAir Canada
Sun 2/86:10 amSOF - DEN
2 stops22h 45mAir Canada
Deal found 12/21$634
This Lufthansa deal was found by Cheapflights users on 12/21. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/264:05 pmDEN - SOF
1 stop22h 05mLufthansa
Sat 5/212:55 pmSOF - DEN
1 stop34h 25mLufthansa
Deal found 12/21$639
This KLM deal was found by Cheapflights users on 12/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/1311:10 amDEN - SOF
2 stops17h 55mKLM
Thu 2/267:00 amSOF - DEN
2 stops18h 39mKLM
Deal found 12/21$646
This Travelocity deal was found by Cheapflights users on 12/22. 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.
Fri 1/95:35 pmDEN - VAR
2 stops36h 40mAustrian Airlines
Fri 1/164:00 pmVAR - DEN
2 stops31h 25mAustrian Airlines
Deal found 12/22$837
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Tue 4/2811:15 amDEN - SOF
2 stops15h 55mUnited Airlines
Tue 5/56:10 amSOF - DEN
1 stop18h 30mUnited Airlines
Deal found 12/21$581
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Tue 4/281:30 pmDEN - SOF
2 stops24h 40mUnited Airlines
Wed 5/66:20 amSOF - DEN
1 stop18h 20mUnited Airlines
Deal found 12/21$581
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Fri 4/248:25 pmDEN - SOF
1 stop17h 45mUnited Airlines
Tue 5/512:55 pmSOF - DEN
1 stop14h 55mUnited Airlines
Deal found 12/21$629
This Mytrip deal was found by Cheapflights users on 12/22. 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 1/94:20 pmDEN - VAR
2 stops24h 10mMultiple Airlines
Fri 1/164:30 pmVAR - DEN
3 stops34h 05mMultiple Airlines
Deal found 12/22$1,529
This oojo deal was found by Cheapflights users on 12/22. 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.
Fri 1/97:20 pmDEN - VAR
1 stop16h 15mTurkish Airlines
Fri 1/1610:00 amVAR - DEN
1 stop16h 35mTurkish Airlines
Deal found 12/22$790
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Wed 2/44:20 pmDEN - SOF
1 stop21h 25mUnited Airlines
Sun 2/86:10 amSOF - DEN
2 stops22h 45mUnited Airlines
Deal found 12/21$630
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Fri 2/132:04 pmDEN - SOF
2 stops23h 41mUnited Airlines
Thu 2/266:05 amSOF - DEN
1 stop21h 50mUnited Airlines
Deal found 12/21$645

Find flight deals from Colorado to Bulgaria

Keep the following information in mind while searching for Colorado to Bulgaria flight deals. Data was last updated December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$509
(KAYAK)

Popular in

July

Cheapest in

April

Average price

$1,026
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
Search Deals
From Colorado to Bulgaria
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($270 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 23, 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

Thu 1/22

5:30 am-10:45 pm

2 stops32h 15m

Sofia

Mon 1/26

6:10 am-8:38 pm

2 stops23h 28m

$546

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 4/28

11:15 am-12:10 pm

2 stops15h 55m

Sofia

Tue 5/5

6:10 am-3:40 pm

1 stop18h 30m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 4/28

1:30 pm-11:10 pm

2 stops24h 40m

Sofia

Wed 5/6

6:20 am-3:40 pm

1 stop18h 20m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 4/4

8:25 pm-8:15 pm

1 stop14h 50m

Sofia

Mon 4/13

3:50 pm-6:25 pm

1 stop35h 35m

$597

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 4/24

8:25 pm-11:10 pm

1 stop17h 45m

Sofia

Tue 5/5

12:55 pm-6:50 pm

1 stop14h 55m

$629

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 2/4

4:20 pm-10:45 pm

1 stop21h 25m

Sofia

Sun 2/8

6:10 am-7:55 pm

2 stops22h 45m

$630

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 2/4

11:15 am-6:20 pm

2 stops22h 05m

Sofia

Sun 2/8

6:10 am-7:55 pm

2 stops22h 45m

$634

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 4/26

4:05 pm-11:10 pm

1 stop22h 05m

Sofia

Sat 5/2

12:55 pm-2:20 pm

1 stop34h 25m

$639

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 2/13

2:04 pm-10:45 pm

2 stops23h 41m

Sofia

Thu 2/26

6:05 am-6:55 pm

1 stop21h 50m

$645

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 2/13

11:10 am-2:05 pm

2 stops17h 55m

Sofia

Thu 2/26

7:00 am-4:39 pm

2 stops18h 39m

$646

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

Showing 1-10 of 13 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 December is currently the most expensive (average of $908). 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 December 23, 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. United Airlines provides one of the quickest options available for as low as $597. 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 $908). 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$522Average$624FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$616Average$1,114FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$656Average$1,023FlexibilityNo cancel feeOn-time69%

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