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$451+ 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 6/8. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Jun 4 — Jun 111
Thu 6/4
Thu 6/11
1 adult, Economy
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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 May 5, 2026.

This FlightHub deal was found by Cheapflights users on 4/30. 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.
Fri 8/142:05 pm
SOF
-
DEN
1 stop37h 20m
Turkish Airlines
Sat 8/298:25 pm
DEN
-
SOF
1 stop33h 35m
Turkish Airlines
Deal found 4/30$933
This oojo deal was found by Cheapflights users on 4/30. 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.
Thu 8/139:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Thu 8/278:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Deal found 4/30$962
This FlightHub deal was found by Cheapflights users on 4/30. 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.
Wed 8/123:50 pm
SOF
-
DEN
1 stop35h 35m
Turkish Airlines
Thu 8/278:25 pm
DEN
-
SOF
1 stop33h 35m
Turkish Airlines
Deal found 4/30$973
This United Airlines deal was found by Cheapflights users on 5/1. 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.
Fri 5/296:20 am
SOF
-
DEN
1 stop16h 10m
United Airlines
Thu 6/41:53 pm
DEN
-
SOF
2 stops19h 32m
United Airlines
Deal found 5/1$975
This United Airlines deal was found by Cheapflights users on 5/5. 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.
Sat 9/196:20 am
SOF
-
ASE
2 stops20h 57m
United Airlines
Fri 10/93:30 pm
ASE
-
SOF
2 stops22h 45m
United Airlines
Deal found 5/5$977
This Expedia deal was found by Cheapflights users on 5/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:20 am
SOF
-
ASE
2 stops24h 21m
Lufthansa
Fri 10/92:00 pm
ASE
-
SOF
2 stops24h 15m
Lufthansa
Deal found 5/4$985
This Lufthansa deal was found by Cheapflights users on 4/30. 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.
Wed 8/127:00 pm
SOF
-
DEN
1 stop27h 30m
Lufthansa
Fri 8/288:25 pm
DEN
-
SOF
1 stop17h 50m
Lufthansa
Deal found 4/30$991
This Expedia deal was found by Cheapflights users on 4/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:45 pm
SOF
-
DEN
2 stops38h 34m
Lufthansa
Thu 8/274:15 pm
DEN
-
SOF
1 stop17h 25m
Lufthansa
Deal found 4/30$1,002
This United Airlines deal was found by Cheapflights users on 4/30. 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 8/126:20 am
SOF
-
DEN
2 stops21h 03m
United Airlines
Sun 8/309:35 am
DEN
-
SOF
2 stops17h 35m
United Airlines
Deal found 4/30$1,006
This Turkish Airlines deal was found by Cheapflights users on 4/30. 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.
Sat 8/153:50 pm
SOF
-
DEN
1 stop35h 35m
Turkish Airlines
Tue 8/258:25 pm
DEN
-
SOF
1 stop14h 50m
Turkish Airlines
Deal found 4/30$1,007
This United Airlines deal was found by Cheapflights users on 4/30. 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 8/116:10 am
SOF
-
DEN
2 stops25h 35m
United Airlines
Fri 8/281:53 pm
DEN
-
SOF
2 stops24h 22m
United Airlines
Deal found 4/30$1,018
This Turkish Airlines deal was found by Cheapflights users on 4/30. 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 8/139:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Tue 8/258:25 pm
DEN
-
SOF
1 stop27h 20m
Turkish Airlines
Deal found 4/30$1,023

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 May 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$933
(FlightHub)

One-way from

$451
(Kiwi.com)

Popular in

August

Cheapest in

September

Average price

$999
Provider with most accurate pricing for Sofia-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Denver Intl flights.
Search Deals
From Bulgaria to Colorado
Search Deals
One-way flight from Bulgaria to Colorado
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 5, 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

SofiaAspen

SOF - ASE

SOFASE

Sofia

Sat 9/19

6:20 am-6:17 pm

2 stops20h 57m

Aspen Pitkin County

Fri 10/9

3:30 pm-11:15 pm

2 stops22h 45m

$977

SofiaAspen

SOF - ASE

SOFASE

Sofia

Sat 9/19

6:20 am-9:41 pm

2 stops24h 21m

Aspen Pitkin County

Fri 10/9

2:00 pm-11:15 pm

2 stops24h 15m

$985
Quickest round-trip

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 8/12

6:20 am-6:23 pm

2 stops21h 03m

Denver Intl

Tue 8/25

8:25 pm-6:40 pm

1 stop13h 15m

$1,006

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 8/12

6:20 am-8:08 pm

2 stops22h 48m

Denver Intl

Thu 8/27

8:25 pm-11:15 pm

1 stop17h 50m

$1,006

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Wed 8/12

6:20 am-8:08 pm

2 stops22h 48m

Denver Intl

Sat 8/29

4:15 pm-11:15 pm

1 stop22h 00m

$1,006

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 8/14

6:20 am-12:19 am

2 stops26h 59m

Denver Intl

Sat 8/29

4:45 pm-11:15 pm

2 stops21h 30m

$1,041

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 6/13

6:20 am-10:33 am

2 stops37h 13m

Denver Intl

Sat 6/20

8:25 pm-11:15 pm

1 stop17h 50m

$1,045

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 8/10

3:50 pm-6:25 pm

1 stop35h 35m

Denver Intl

Sun 8/30

8:25 pm-8:15 pm

1 stop14h 50m

$1,058

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 8/10

3:50 pm-6:25 pm

1 stop35h 35m

Denver Intl

Thu 8/27

8:25 pm-8:15 pm

1 stop14h 50m

$1,058

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 6/13

7:00 am-3:40 pm

1 stop17h 40m

Denver Intl

Sat 6/20

5:40 pm-2:00 pm

1 stop35h 20m

$1,082

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/5

Showing 1-10 of 21 resultsSorted by cheapest first
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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 May 5, 2026.
Read reviews from past customers who have flown Turkish Airlines,United Airlines, andLufthansa from Bulgaria to Colorado. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Turkish Airlines
7.4
Good
4,350 reviews

Comfort

7.3

Food

7.5

Overall

7.4

Entertainment

7.5

Boarding

7.3

Crew

7.8

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
Turkish Airlines
7.4
Good
4,350 reviews
Turkish Airlines
7.4
Good
4,350 reviews

Comfort

7.3

Food

7.5

Overall

7.4

Entertainment

7.5

Boarding

7.3

Crew

7.8

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
United Airlines
7.4
Good
9,683 reviews
Turkish Airlines
7.4
Good
4,350 reviews

Comfort

7.3

Food

7.5

Overall

7.4

Entertainment

7.5

Boarding

7.3

Crew

7.8

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you
Lufthansa
6.8
Okay
7,974 reviews
Turkish Airlines
7.4
Good
4,350 reviews

Comfort

7.3

Food

7.5

Overall

7.4

Entertainment

7.5

Boarding

7.3

Crew

7.8

Reviews

1 / 20
8.0
Excellent

Muhammad,Jan 2026

ORD - DFW

Great, customer service agent at O’hare was able to change the flight due to snow storm. Thank you

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, Lufthansa, and KLM can get you from Bulgaria to Colorado in just under 20h 57m. Your travel time can differ by up to 3h 24m. There are 5974 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 $770. Lufthansa flights start at $799 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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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 May 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$862FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$773Average$838FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$802Average$991FlexibilityNo cancel feeOn-time76%

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