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Bulgaria

$203+ 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 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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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 January 21, 2026.

This FlightHub deal was found by Cheapflights users on 1/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/244:15 pm
DEN
-
SOF
2 stops17h 05m
Lufthansa
Tue 3/36:00 am
SOF
-
DEN
1 stop19h 00m
Lufthansa
Deal found 1/21$484
This United Airlines deal was found by Cheapflights users on 1/21. 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 2/248:20 pm
DEN
-
SOF
1 stop17h 25m
United Airlines
Tue 3/36:00 am
SOF
-
DEN
1 stop19h 00m
United Airlines
Deal found 1/21$487
This Mytrip deal was found by Cheapflights users on 1/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1911:15 am
DEN
-
SOF
2 stops17h 00m
Multiple Airlines
Thu 2/262:35 pm
SOF
-
DEN
2 stops28h 48m
Multiple Airlines
Deal found 1/20$522
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Wed 3/48:20 pm
DEN
-
SOF
1 stop13h 00m
United Airlines
Sun 3/86:05 am
SOF
-
DEN
1 stop21h 50m
United Airlines
Deal found 1/20$539
This Air Canada deal was found by Cheapflights users on 1/20. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:15 am
DEN
-
SOF
2 stops22h 05m
Air Canada
Sun 3/86:05 am
SOF
-
DEN
2 stops38h 32m
Air Canada
Deal found 1/20$542
This British Airways deal was found by Cheapflights users on 1/20. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:40 pm
DEN
-
SOF
1 stop15h 40m
British Airways
Sun 4/129:05 pm
SOF
-
DEN
2 stops31h 50m
British Airways
Deal found 1/20$550
This United Airlines deal was found by Cheapflights users on 1/20. 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 2/193:55 pm
DEN
-
SOF
1 stop12h 55m
United Airlines
Thu 2/266:05 am
SOF
-
DEN
1 stop21h 50m
United Airlines
Deal found 1/20$551
This United Airlines deal was found by Cheapflights users on 1/19. 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 2/47:00 am
GJT
-
SOF
2 stops26h 20m
United Airlines
Sun 2/82:00 pm
SOF
-
GJT
2 stops57h 46m
United Airlines
Deal found 1/19$640
This FlightHub deal was found by Cheapflights users on 1/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:15 pm
DEN
-
VAR
1 stop19h 30m
Lufthansa
Wed 7/229:30 pm
VAR
-
DEN
1 stop25h 15m
Lufthansa
Deal found 1/21$665
This KAYAK deal was found by Cheapflights users on 1/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/84:15 pm
DEN
-
VAR
1 stop31h 45m
Lufthansa
Wed 7/229:30 pm
VAR
-
DEN
1 stop25h 15m
Lufthansa
Deal found 1/21$764
This Lufthansa deal was found by Cheapflights users on 1/21. 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 7/54:15 pm
DEN
-
VAR
2 stops18h 20m
Lufthansa
Wed 7/229:30 pm
VAR
-
DEN
1 stop25h 15m
Lufthansa
Deal found 1/21$768
This FlightHub deal was found by Cheapflights users on 1/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:15 pm
DEN
-
VAR
1 stop19h 30m
Multiple Airlines
Tue 7/219:00 pm
VAR
-
DEN
2 stops29h 35m
Multiple Airlines
Deal found 1/21$779

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 January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$484
(FlightHub)

One-way from

$203
(Kiwi.com)

Popular in

July

Cheapest in

April

Average price

$693
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
One-way flight from Colorado to Bulgaria
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($279 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($42 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 21, 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

Tue 2/24

4:15 pm-6:20 pm

2 stops17h 05m

Sofia

Tue 3/3

6:00 am-4:00 pm

1 stop19h 00m

$484

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 2/24

8:20 pm-10:45 pm

1 stop17h 25m

Sofia

Tue 3/3

6:00 am-4:00 pm

1 stop19h 00m

$487

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 2/19

11:15 am-1:15 pm

2 stops17h 00m

Sofia

Thu 2/26

2:35 pm-10:23 am

2 stops28h 48m

$522

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

$539

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 3/4

11:15 am-6:20 pm

2 stops22h 05m

Sofia

Sun 3/8

6:05 am-11:37 am

2 stops38h 32m

$542

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 4/5

6:40 pm-7:20 pm

1 stop15h 40m

Sofia

Sun 4/12

9:05 pm-7:55 pm

2 stops31h 50m

$550

Grand JunctionSofia

GJT - SOF

GJTSOF

Grand Junction Regnl

Wed 2/4

7:00 am-6:20 pm

2 stops26h 20m

Sofia

Sun 2/8

2:00 pm-2:46 pm

2 stops57h 46m

$640

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Tue 7/7

4:15 pm-8:45 pm

1 stop19h 30m

Varna

Wed 7/22

9:30 pm-11:50 pm

2 stops35h 20m

$682

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Wed 7/8

4:15 pm-9:00 am

1 stop31h 45m

Varna

Wed 7/22

9:30 pm-1:45 pm

1 stop25h 15m

$764

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Sun 7/5

4:15 pm-7:35 pm

2 stops18h 20m

Varna

Wed 7/22

9:30 pm-1:45 pm

1 stop25h 15m

$768

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 28 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, April is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $534). 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 17h 05m. Lufthansa provides one of the quickest options available for as low as $484. 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, April is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $534). 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

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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.
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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 January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$534Average$630FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$656Average$1,023FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$672Average$1,050FlexibilityNo cancel feeOn-time76%

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