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Bulgaria

$429+ 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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Μαρ 16 — Μαρ 231
Δευ 3/16
Δευ 3/23
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 Φεβρουάριος 14, 2026.

This Justfly.com deal was found by Cheapflights users on 2/14. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Τρι 3/245:20 pm
DEN
-
SOF
1 stop21h 25m
Lufthansa
Τρι 4/76:10 am
SOF
-
DEN
1 stop18h 30m
Lufthansa
Deal found 2/14$564
This KAYAK deal was found by Cheapflights users on 2/14. 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.
Τρι 3/246:25 pm
DEN
-
SOF
1 stop17h 45m
British Airways
Δευ 4/68:10 pm
SOF
-
DEN
1 stop29h 20m
British Airways
Deal found 2/14$577
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Τετ 3/259:20 pm
DEN
-
SOF
1 stop17h 25m
United Airlines
Τετ 4/86:20 am
SOF
-
DEN
1 stop16h 15m
United Airlines
Deal found 2/14$579
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Τρι 3/245:20 pm
DEN
-
SOF
1 stop17h 00m
United Airlines
Πεμ 4/96:10 am
SOF
-
DEN
1 stop17h 10m
United Airlines
Deal found 2/14$581
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Τρι 3/245:20 pm
DEN
-
SOF
1 stop21h 25m
United Airlines
Τρι 4/76:10 am
SOF
-
DEN
2 stops22h 45m
United Airlines
Deal found 2/14$582
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Δευ 3/2311:15 am
DEN
-
SOF
2 stops23h 05m
United Airlines
Τετ 4/86:20 am
SOF
-
DEN
1 stop18h 20m
United Airlines
Deal found 2/14$584
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Δευ 3/234:25 pm
DEN
-
SOF
2 stops22h 20m
United Airlines
Πεμ 4/96:10 am
SOF
-
DEN
1 stop17h 10m
United Airlines
Deal found 2/14$585
This KAYAK deal was found by Cheapflights users on 2/13. 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.
Δευ 3/235:20 pm
DEN
-
SOF
1 stop17h 00m
Lufthansa
Παρ 4/106:10 am
SOF
-
DEN
1 stop17h 10m
Lufthansa
Deal found 2/13$586
This FlightHub deal was found by Cheapflights users on 2/14. 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.
Τετ 3/251:25 pm
DEN
-
SOF
2 stops20h 55m
Multiple Airlines
Τρι 4/76:10 am
SOF
-
DEN
1 stop18h 30m
Multiple Airlines
Deal found 2/14$587
This United Airlines deal was found by Cheapflights users on 2/14. 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.
Τετ 3/259:20 pm
DEN
-
SOF
1 stop13h 00m
United Airlines
Πεμ 4/92:10 pm
SOF
-
DEN
2 stops18h 34m
United Airlines
Deal found 2/14$589
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Τετ 2/256:15 pm
GJT
-
SOF
2 stops19h 30m
United Airlines
Κυρ 3/12:00 pm
SOF
-
GJT
2 stops36h 02m
United Airlines
Deal found 2/10$746
This Turkish 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Τετ 3/43:20 pm
DEN
-
VAR
2 stops32h 50m
Turkish Airlines
Κυρ 3/810:00 am
VAR
-
DEN
2 stops36h 48m
Turkish Airlines
Deal found 2/11$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 Φεβρουάριος 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$564
(Justfly.com)

One-way from

$429
(Kiwi.com)

Popular in

December

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
One-way flight from Colorado to Bulgaria
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($20 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 Φεβρουάριος 14, 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

Τρι 3/24

5:54 pm-6:20 pm

2 stops16h 26m

Sofia

Τρι 4/7

6:10 am-3:40 pm

1 stop18h 30m

$570

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Τετ 3/25

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Τετ 4/8

6:20 am-3:40 pm

1 stop18h 20m

$579

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Δευ 3/23

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Τρι 4/7

6:10 am-3:40 pm

1 stop18h 30m

$579

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Τρι 3/24

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Παρ 4/10

6:10 am-2:20 pm

1 stop17h 10m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Δευ 3/23

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Πεμ 4/9

6:10 am-2:20 pm

1 stop17h 10m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Τρι 3/24

5:20 pm-6:20 pm

1 stop17h 00m

Sofia

Πεμ 4/9

6:10 am-2:20 pm

1 stop17h 10m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Τετ 3/25

9:20 pm-10:45 pm

1 stop17h 25m

Sofia

Πεμ 4/9

6:10 am-2:20 pm

1 stop17h 10m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Τετ 3/25

9:20 pm-10:45 pm

1 stop17h 25m

Sofia

Παρ 4/10

6:10 am-2:20 pm

1 stop17h 10m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Δευ 3/23

3:10 pm-10:45 pm

2 stops23h 35m

Sofia

Τρι 4/7

6:10 am-3:40 pm

1 stop18h 30m

$584

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Τρι 3/24

9:36 am-1:15 pm

2 stops19h 39m

Sofia

Τετ 4/8

6:20 am-1:35 pm

1 stop16h 15m

$584

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/14

Showing 1-10 of 15 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 16h 26m. Lufthansa provides one of the quickest options available for as low as $570. 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 Φεβρουάριος 14, 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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