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Bulgaria

$568+ 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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
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 February 13, 2026.

This FlightHub deal was found by Cheapflights users on 2/12. 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 3/245:20 pm
DEN
-
SOF
1 stop21h 25m
Lufthansa
Tue 4/76:10 am
SOF
-
DEN
1 stop18h 30m
Lufthansa
Deal found 2/12$568
This United Airlines deal was found by Cheapflights users on 2/11. 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 3/119:51 am
DEN
-
SOF
2 stops28h 54m
United Airlines
Wed 3/186:10 am
SOF
-
DEN
1 stop18h 50m
United Airlines
Deal found 2/11$587
This oojo deal was found by Cheapflights users on 2/10. 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 5/38:25 pm
DEN
-
SOF
1 stop27h 20m
Turkish Airlines
Sat 5/169:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Deal found 2/10$604
This Trip.com deal was found by Cheapflights users on 2/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/94:15 pm
DEN
-
SOF
1 stop21h 45m
Lufthansa
Sat 8/156:10 am
SOF
-
DEN
1 stop16h 35m
Lufthansa
Deal found 2/10$631
This Gotogate deal was found by Cheapflights users on 2/10. 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.
Sun 8/911:25 am
DEN
-
SOF
2 stops21h 45m
Multiple Airlines
Sat 8/157:25 pm
SOF
-
DEN
1 stop27h 20m
Multiple Airlines
Deal found 2/10$651
This Gotogate deal was found by Cheapflights users on 2/10. 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.
Sun 5/35:40 pm
DEN
-
SOF
1 stop15h 30m
Multiple Airlines
Sat 5/166:20 am
SOF
-
DEN
2 stops21h 40m
Multiple Airlines
Deal found 2/10$663
This Air Canada deal was found by Cheapflights users on 2/12. 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.
Tue 5/2611:25 am
DEN
-
SOF
2 stops22h 15m
Air Canada
Wed 6/106:20 am
SOF
-
DEN
2 stops25h 50m
Air Canada
Deal found 2/12$674
This Air Canada deal was found by Cheapflights users on 2/12. 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.
Tue 5/2611:25 am
DEN
-
SOF
2 stops22h 15m
Air Canada
Thu 6/1112:55 pm
SOF
-
DEN
2 stops30h 39m
Air Canada
Deal found 2/12$678
This United Airlines deal was found by Cheapflights users on 2/9. 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 2/251:43 pm
GJT
-
SOF
2 stops24h 02m
United Airlines
Sun 3/16:05 am
SOF
-
GJT
2 stops43h 57m
United Airlines
Deal found 2/9$746
This Turkish Airlines deal was found by Cheapflights users on 2/9. 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 stops20h 15m
Turkish Airlines
Sun 3/810:00 am
VAR
-
DEN
2 stops36h 48m
Turkish Airlines
Deal found 2/9$1,090

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 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$568
(FlightHub)

Popular in

July

Cheapest in

April

Average price

$791
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. 16% potential increase in price ($155 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 13, 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 3/24

5:54 pm-6:20 pm

2 stops16h 26m

Sofia

Tue 4/7

6:10 am-3:40 pm

1 stop18h 30m

$570

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 3/11

9:51 am-10:45 pm

2 stops28h 54m

Sofia

Wed 3/18

6:10 am-5:00 pm

1 stop18h 50m

$587

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 5/3

8:25 pm-8:45 am

1 stop27h 20m

Sofia

Sat 5/16

9:35 am-6:25 pm

1 stop17h 50m

$604

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 5/3

5:40 pm-6:10 pm

1 stop15h 30m

Sofia

Sat 5/16

6:20 am-7:00 pm

2 stops21h 40m

$663

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 8/9

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

Sat 8/15

6:20 am-1:45 pm

2 stops40h 25m

$663

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 5/24

4:20 pm-12:10 pm

2 stops34h 50m

Sofia

Fri 6/12

6:20 am-10:34 am

2 stops37h 14m

$683

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 7/12

8:25 pm-3:00 pm

1 stop33h 35m

Sofia

Sat 7/25

3:50 pm-6:25 pm

1 stop35h 35m

$704

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 5/24

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

Mon 6/15

2:20 pm-10:34 am

2 stops53h 14m

$704

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

Grand JunctionSofia

GJT - SOF

GJTSOF

Grand Junction Regnl

Wed 2/25

1:43 pm-10:45 pm

2 stops24h 02m

Sofia

Sun 3/1

6:05 am-5:02 pm

2 stops43h 57m

$746

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/12

Showing 1-10 of 11 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, 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 27h 20m. United Airlines provides one of the quickest options available for as low as $604. 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

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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 February 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$535Average$778FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$616Average$1,026FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$686Average$982FlexibilityNo cancel feeOn-time69%

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