HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bulgaria

$335+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Sep 1 — Sep 81
Tue 9/1
Tue 9/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado to Bulgaria with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 August 2, 2026.

This Turkish Airlines deal was found by Cheapflights users on 7/31. 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 10/38:30 pm
DEN
-
SOF
1 stop33h 30m
Turkish Airlines
Tue 10/139:35 am
SOF
-
DEN
1 stop17h 50m
Turkish Airlines
Deal found 7/31$730
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Sun 12/68:30 pm
DEN
-
SOF
1 stop17h 15m
United Airlines
Thu 12/106:25 am
SOF
-
DEN
1 stop18h 10m
United Airlines
Deal found 7/28$740
This Turkish Airlines deal was found by Cheapflights users on 8/1. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/138:30 pm
DEN
-
SOF
1 stop33h 30m
Turkish Airlines
Fri 8/283:50 pm
SOF
-
DEN
1 stop35h 35m
Turkish Airlines
Deal found 8/1$746
This Expedia deal was found by Cheapflights users on 7/31. 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 10/38:30 pm
DEN
-
VAR
1 stop27h 00m
Turkish Airlines
Sat 10/1010:15 pm
VAR
-
DEN
1 stop29h 10m
Turkish Airlines
Deal found 7/31$768
This oojo deal was found by Cheapflights users on 7/30. 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 11/54:15 pm
DEN
-
SOF
1 stop17h 05m
Lufthansa
Mon 11/92:00 pm
SOF
-
DEN
1 stop33h 30m
Lufthansa
Deal found 7/30$779
This Air Canada deal was found by Cheapflights users on 7/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:48 am
DEN
-
SOF
2 stops21h 32m
Multiple Airlines
Mon 11/97:00 pm
SOF
-
DEN
2 stops34h 27m
Multiple Airlines
Deal found 7/30$809
This FlightHub deal was found by Cheapflights users on 7/31. 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.
Sat 10/34:38 pm
DEN
-
VAR
2 stops33h 52m
Lufthansa
Sat 10/109:20 am
VAR
-
DEN
2 stops48h 10m
Lufthansa
Deal found 7/31$946
This FlightHub deal was found by Cheapflights users on 7/31. 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.
Sat 10/38:30 pm
DEN
-
VAR
1 stop27h 00m
Multiple Airlines
Sat 10/1010:00 am
VAR
-
DEN
2 stops37h 18m
Multiple Airlines
Deal found 7/31$947
This Turkish Airlines deal was found by Cheapflights users on 7/29. 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.
Sun 11/18:30 pm
DEN
-
VAR
1 stop27h 45m
Turkish Airlines
Thu 11/59:25 pm
VAR
-
DEN
1 stop30h 00m
Turkish Airlines
Deal found 7/29$1,092

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 August 2, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$730
(Turkish Airlines)

One-way from

$335
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$829
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. 3% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 2, 2026.
Use the filters below to find and compare flights from Colorado to Bulgaria that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 10/3

8:30 pm-3:00 pm

1 stop33h 30m

Sofia

Tue 10/13

9:35 am-6:25 pm

1 stop17h 50m

$730

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 12/6

8:30 pm-10:45 pm

1 stop17h 15m

Sofia

Thu 12/10

6:25 am-3:35 pm

1 stop18h 10m

$740

Grand JunctionSofia

GJT - SOF

GJTSOF

Grand Junction Regnl

Sat 1/9

6:10 pm-10:55 pm

2 stops43h 45m

Sofia

Wed 1/13

6:25 am-8:27 pm

2 stops23h 02m

$743

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 11/5

4:10 pm-6:20 pm

2 stops17h 10m

Sofia

Mon 11/9

2:00 pm-2:30 pm

1 stop33h 30m

$786

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 8/24

4:15 pm-11:15 pm

1 stop22h 00m

Sofia

Fri 9/18

6:10 am-1:45 pm

1 stop16h 35m

$912

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/25

6:10 pm-10:30 pm

2 stops19h 20m

Sofia

Fri 10/2

6:20 am-12:30 am

2 stops27h 10m

$923
Quickest round-trip

DenverVarna

DEN - VAR

DENVAR

Denver Intl

Sat 10/3

6:00 am-8:30 am

2 stops17h 30m

Varna

Sat 10/10

10:00 am-6:25 pm

1 stop17h 25m

$957

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/25

5:40 pm-10:30 pm

1 stop19h 50m

Sofia

Fri 10/2

6:20 am-1:35 pm

1 stop16h 15m

$985

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/18

7:31 pm-6:40 pm

2 stops38h 09m

Sofia

Sat 9/26

6:20 am-6:09 pm

2 stops20h 49m

$998

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/18

6:00 am-3:00 pm

2 stops48h 00m

Sofia

Sat 9/26

9:10 pm-6:25 pm

1 stop30h 15m

$1,006

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

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, November is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $600). Flying from Colorado to Bulgaria in December is currently the most expensive (average of $1,026). 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.

How far ahead should I book a flight from Colorado to Bulgaria?

The price you pay for your flight from Colorado to Bulgaria may vary depending on when you book. For the best chance of a lower fare, look to book 60 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 10m. Turkish Airlines provides one of the quickest options available for as low as $786. 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, November is the cheapest month in which you can book a flight from Colorado to Bulgaria (average of $600). Flying from Colorado to Bulgaria in December is currently the most expensive (average of $1,026). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Colorado to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Charles de Gaulle flights
Newark to Charles de Gaulle flights
Newark to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Leonardo da Vinci/Fiumicino flights
John F Kennedy Intl to Gatwick flights
LaGuardia to Heathrow flights
John F Kennedy Intl to Istanbul flights
Newark to Gatwick flights
Dulles Intl to Heathrow flights
Boston to Heathrow flights
John F Kennedy Intl to London City flights
Newark to Athens flights
John F Kennedy Intl to Athens flights
John F Kennedy Intl to Barcelona-El Prat flights
John F Kennedy Intl to Lisbon flights
Baltimore to Heathrow flights
Newark to Barcelona-El Prat flights
John F Kennedy Intl to Orly flights
Newark to Madrid flights
John F Kennedy Intl to Madrid flights
Miami to Madrid flights
Newark to Dublin flights
Newark to Lisbon flights
Newark to Orly flights
Los Angeles to Heathrow flights
John F Kennedy Intl to Malpensa flights
John F Kennedy Intl to Frankfurt flights
John F Kennedy Intl to Dublin flights
San Francisco to Heathrow flights
O'Hare Intl to Heathrow flights
Los Angeles to Leonardo da Vinci/Fiumicino flights
LaGuardia to Gatwick flights
Newark to Malpensa flights
John F Kennedy Intl to Copenhagen flights
Boston to Charles de Gaulle flights
Newark to Frankfurt flights
Los Angeles to Charles de Gaulle flights
Dallas/Fort Worth to Heathrow flights
Newark to Copenhagen flights
John F Kennedy Intl to Frederic Chopin flights
Dulles Intl to Charles de Gaulle flights
O'Hare Intl to Leonardo da Vinci/Fiumicino flights
O'Hare Intl to Charles de Gaulle flights
Seattle to Heathrow flights

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 August 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$568Average$702FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$634Average$982FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$686Average$1,003FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.