Bulgaria

$365+ 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 5/25. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Mar 24 — Mar 311
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Cheap 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 February 22, 2026.

This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:40 pm
DEN
-
SOF
1 stop20h 00m
Multiple Airlines
Tue 9/296:10 am
SOF
-
DEN
2 stops25h 58m
Multiple Airlines
Deal found 2/20$565
This FlightHub deal was found by Cheapflights users on 2/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:40 pm
DEN
-
SOF
1 stop15h 20m
Lufthansa
Tue 9/297:25 pm
SOF
-
DEN
1 stop27h 55m
Lufthansa
Deal found 2/20$602
This deal was found by Cheapflights users on 2/21. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/248:20 pm
DEN
-
SOF
1 stop16h 30m
Turkish Airlines
Thu 4/99:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Deal found 2/21$638
This Turkish Airlines deal was found by Cheapflights users on 2/20. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:20 pm
DEN
-
SOF
1 stop16h 30m
Turkish Airlines
Mon 3/94:00 pm
SOF
-
DEN
1 stop34h 35m
Turkish Airlines
Deal found 2/20$663
This United Airlines deal was found by Cheapflights users on 2/19. 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 3/48:20 pm
DEN
-
SOF
1 stop17h 25m
United Airlines
Sun 3/86:05 am
SOF
-
DEN
1 stop21h 50m
United Airlines
Deal found 2/19$732
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Mon 5/256:10 pm
DEN
-
SOF
2 stops33h 00m
United Airlines
Sun 6/76:10 am
SOF
-
DEN
2 stops35h 12m
United Airlines
Deal found 2/19$750
This United Airlines deal was found by Cheapflights users on 2/19. 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 2/255:30 am
GJT
-
SOF
2 stops32h 15m
United Airlines
Sun 3/16:05 am
SOF
-
GJT
2 stops25h 16m
United Airlines
Deal found 2/19$874
This oojo deal was found by Cheapflights users on 2/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/87:45 am
DEN
-
VAR
2 stops28h 50m
Turkish Airlines
Thu 3/129:25 pm
VAR
-
DEN
1 stop29h 10m
Turkish Airlines
Deal found 2/21$1,064
This Turkish Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 3/43:20 pm
DEN
-
VAR
2 stops32h 50m
Turkish Airlines
Sun 3/810:00 am
VAR
-
DEN
2 stops36h 48m
Turkish Airlines
Deal found 2/19$1,090
This KAYAK deal was found by Cheapflights users on 2/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:30 am
GJT
-
SOF
3 stops22h 45m
Lufthansa
Wed 2/256:10 am
SOF
-
GJT
2 stops25h 11m
Lufthansa
Deal found 2/19$1,570
This Mytrip deal was found by Cheapflights users on 2/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/811:15 am
DEN
-
VAR
3 stops25h 20m
Multiple Airlines
Thu 3/124:00 pm
VAR
-
DEN
3 stops34h 35m
Multiple Airlines
Deal found 2/21$1,744

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 February 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$638

One-way from

$365
(United Airlines)

Popular in

December

Cheapest in

April

Average price

$791
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
From Colorado to Bulgaria
One-way flight from Colorado to Bulgaria
High demand for flights, 0% potential price rise
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Average for round-trip flights in February 2026

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 February 22, 2026.
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

Thu 3/5

7:20 pm-8:50 pm

1 stop16h 30m

Sofia

Mon 3/9

4:00 pm-6:35 pm

1 stop34h 35m

$663

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 3/4

8:20 pm-10:45 pm

1 stop17h 25m

Sofia

Sun 3/8

6:05 am-6:55 pm

1 stop21h 50m

$732

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 7/12

8:25 pm-3:00 pm

1 stop33h 35m

Sofia

Sat 7/25

9:05 pm-6:25 pm

1 stop30h 20m

$755

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 3/5

1:26 pm-10:45 pm

2 stops24h 19m

Sofia

Mon 3/9

2:20 pm-7:55 pm

2 stops37h 35m

$772

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/25

11:59 pm-8:45 am

2 stops23h 46m

Sofia

Sun 6/7

9:35 am-6:25 pm

1 stop17h 50m

$780

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/25

11:25 am-11:00 am

2 stops38h 35m

Sofia

Sun 6/7

6:10 am-10:34 am

2 stops37h 24m

$784

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Sun 3/8

7:45 am-8:35 pm

2 stops28h 50m

Varna

Thu 3/12

9:25 pm-6:35 pm

1 stop29h 10m

$1,064

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Wed 3/4

3:20 pm-8:35 pm

2 stops20h 15m

Varna

Sun 3/8

10:00 am-1:48 pm

2 stops36h 48m

$1,090

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/25

8:00 am-12:10 pm

2 stops19h 10m

$365

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 5/25

4:40 pm-1:15 am

3 stops47h 35m

$415

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

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, August is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $501). Flying from Colorado to Bulgaria in December is currently the most expensive (average of $906). 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.

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. Turkish Airlines provides one of the quickest options available for as low as $663. 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, August is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $501). Flying from Colorado to Bulgaria in December is currently the most expensive (average of $906). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Colorado to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.

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 February 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$535Average$776FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$616Average$982FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$686Average$957FlexibilityNo cancel feeOn-time69%

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