Colorado

$534+ Cheap flights from Bulgaria to Colorado

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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Apr 9 — Apr 161
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Cheap flight deals from Bulgaria to Colorado

Cheapest flights from Bulgaria to Colorado
Explore the most affordable flight options available from Bulgaria to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.

This United Airlines deal was found by Cheapflights users on 3/7. 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 4/26:30 am
SOF
-
DEN
1 stop16h 05m
United Airlines
Wed 4/88:25 pm
DEN
-
SOF
1 stop17h 35m
United Airlines
Deal found 3/7$858
This Lufthansa deal was found by Cheapflights users on 3/6. 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.
Thu 4/236:30 am
SOF
-
DEN
1 stop18h 10m
Lufthansa
Wed 4/294:05 pm
DEN
-
SOF
1 stop21h 55m
Lufthansa
Deal found 3/6$859
This United Airlines deal was found by Cheapflights users on 3/6. 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 4/236:30 am
SOF
-
DEN
1 stop16h 05m
United Airlines
Wed 4/294:35 pm
DEN
-
SOF
2 stops17h 05m
United Airlines
Deal found 3/6$864
This Lufthansa deal was found by Cheapflights users on 3/9. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:20 am
SOF
-
DEN
1 stop18h 20m
Lufthansa
Mon 5/114:05 pm
DEN
-
SOF
1 stop21h 55m
Lufthansa
Deal found 3/9$881
This Gotogate deal was found by Cheapflights users on 3/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:20 am
SOF
-
DEN
2 stops25h 50m
Multiple Airlines
Mon 5/115:40 pm
DEN
-
SOF
1 stop15h 20m
Multiple Airlines
Deal found 3/9$892
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Mon 5/46:20 am
SOF
-
DEN
1 stop16h 15m
United Airlines
Mon 5/118:25 pm
DEN
-
SOF
1 stop17h 35m
United Airlines
Deal found 3/9$893
This Justfly.com deal was found by Cheapflights users on 3/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:20 am
SOF
-
DEN
2 stops20h 52m
Air Canada
Mon 5/119:30 am
DEN
-
SOF
2 stops18h 55m
Air Canada
Deal found 3/9$895
This Flighttix deal was found by Cheapflights users on 3/7. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:10 am
SOF
-
DEN
1 stop18h 30m
Lufthansa
Thu 5/288:25 pm
DEN
-
SOF
1 stop13h 15m
Lufthansa
Deal found 3/7$976

Find flight deals from Bulgaria to Colorado

Keep the following information in mind while searching for Bulgaria to Colorado flight deals. Data was last updated March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$858
(United Airlines)

One-way from

$534
(Kiwi.com)

Popular in

May

Cheapest in

September

Average price

$1,021
Provider with most accurate pricing for Sofia-Denver Intl flight deals.
Provider most trusted by Cheapflights users for Sofia-Denver Intl flights.
From Bulgaria to Colorado
One-way flight from Bulgaria to Colorado
High demand for flights, 0% potential price rise
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Average for round-trip flights in March 2026

Cheapflights Fare Finder

 
Customize your flight search to find flights from Bulgaria to Colorado 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 March 10, 2026.
Use the filters below to find and compare flights from Bulgaria to Colorado that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 5/12

6:10 am-3:40 pm

1 stop18h 30m

Denver Intl

Thu 5/28

6:13 am-6:40 pm

2 stops27h 27m

$858

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/2

6:30 am-1:35 pm

1 stop16h 05m

Denver Intl

Wed 4/8

8:25 pm-11:00 pm

1 stop17h 35m

$858

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

6:30 am-3:40 pm

1 stop18h 10m

Denver Intl

Wed 4/29

4:05 pm-11:00 pm

1 stop21h 55m

$859
Quickest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

6:30 am-1:35 pm

1 stop16h 05m

Denver Intl

Wed 4/29

4:35 pm-6:40 pm

2 stops17h 05m

$864

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/4

6:20 am-3:40 pm

1 stop18h 20m

Denver Intl

Mon 5/11

4:05 pm-11:00 pm

1 stop21h 55m

$881

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/4

6:20 am-1:35 pm

1 stop16h 15m

Denver Intl

Mon 5/11

8:25 pm-11:00 pm

1 stop17h 35m

$893

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 5/4

12:55 pm-11:10 pm

2 stops19h 15m

Denver Intl

Mon 5/11

9:40 am-10:30 pm

3 stops27h 50m

$1,329

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 4/23

5:00 am-7:00 pm

3 stops23h 00m

Denver Intl

Wed 4/29

1:25 pm-11:10 am

2 stops36h 45m

$1,421
Cheapest one-way

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 3/17

3:10 pm-12:52 pm

3 stops53h 42m

$534

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 6/1

8:10 pm-11:59 pm

2 stops36h 49m

$585

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

Best time to book a flight from Bulgaria to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Bulgaria 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 Bulgaria to Colorado
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated March 10, 2026.
Read reviews from past customers who have flown United Airlines,Turkish Airlines, andLufthansa from Bulgaria to Colorado. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.1

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

Crew

8.1

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

Crew

8.1

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

Crew

8.1

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

Comfort

7.3

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

Related info for your journey

Find useful and relevant information for your journey from Bulgaria to Colorado. 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 Bulgaria to Colorado?

    United Airlines and Lufthansa can get you from Bulgaria to Colorado in just under 16h 05m. Your travel time can differ by up to 2h 05m. There are 5871 mi between Bulgaria and Colorado. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Bulgaria to Colorado one-way?

    To fly one-way, consider booking your trip with Turkish Airlines, which is currently one of the cheapest options available, starting at $753. Lufthansa flights start at $771 while deals on United Airlines start at $845 one-way.

  • Can I find deals for flights from Bulgaria to Colorado that include hotel bookings?

    Yes. In addition to deals on Bulgaria to Colorado flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Bulgaria to Colorado?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Bulgaria to Colorado.

  • Can I find deals for business class flights from Bulgaria to Colorado?

    Yes. Cheapflights offers flight deals from Bulgaria to Colorado by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Bulgaria to Colorado

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

Top 3 airlines flying from Bulgaria to Colorado

Discover the top 3 airlines that operate flights from Bulgaria to Colorado. 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 March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$860FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$763Average$830FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$784Average$1,013FlexibilityNo cancel feeOn-time76%

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