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Bulgaria

$460+ 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 6/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
May 5 — May 121
Mon 5/5
Mon 5/12
1 adult, Economy
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Cheap flight deals from Colorado to Bulgaria

Keep the following information in mind while searching for Colorado to Bulgaria flight deals. Data was last updated April 30, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$639
(FlightHub)

One-way from

$460
(Kiwi.com)

Popular in

June

Cheapest in

April

Average price

$581
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
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From Colorado to Bulgaria
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One-way flight from Colorado to Bulgaria
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Highest demand for flights based on searches. 30% potential increase in price ($396 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find 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 April 30, 2025.

This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/47:50 pmDEN - SOF
1 stop33h 55mTurkish Airlines
Tue 9/99:25 amSOF - DEN
1 stop17h 30mTurkish Airlines
Deal found 4/29$639
This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/44:15 pmDEN - SOF
1 stop21h 45mUnited Airlines
Tue 9/96:20 amSOF - DEN
2 stops36h 54mUnited Airlines
Deal found 4/29$780
This SWISS deal was found by Cheapflights users on 4/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/155:50 pmDEN - SOF
1 stop33h 40mSWISS
Tue 8/191:15 pmSOF - DEN
1 stop36h 05mSWISS
Deal found 4/29$789
This United deal was found by Cheapflights users on 4/29. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/1511:59 pmDEN - SOF
2 stops27h 01mMultiple Airlines
Tue 8/191:15 pmSOF - DEN
1 stop36h 05mMultiple Airlines
Deal found 4/29$796
This British Airways deal was found by Cheapflights users on 4/29. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/156:35 pmDEN - SOF
1 stop15h 35mBritish Airways
Wed 8/209:30 pmSOF - DEN
1 stop27h 55mBritish Airways
Deal found 4/29$809
This FlightHub deal was found by Cheapflights users on 4/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/144:15 pmDEN - SOF
1 stop21h 45mLufthansa
Wed 8/206:00 amSOF - DEN
1 stop16h 45mLufthansa
Deal found 4/29$864
This Air Canada deal was found by Cheapflights users on 4/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2811:24 amDEN - SOF
2 stops21h 26mAir Canada
Tue 6/106:20 amSOF - DEN
2 stops24h 08mAir Canada
Deal found 4/29$972
This Austrian Airlines deal was found by Cheapflights users on 4/29. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/135:40 pmDEN - SOF
2 stops39h 30mAustrian Airlines
Wed 8/206:55 pmSOF - DEN
2 stops30h 40mAustrian Airlines
Deal found 4/29$1,122

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 April 30, 2025.
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

Thu 9/4

7:50 pm-2:45 pm

1 stop33h 55m

Sofia

Tue 9/9

9:25 am-5:55 pm

1 stop17h 30m

$639

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 9/4

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

Tue 9/9

6:20 am-10:14 am

2 stops36h 54m

$780

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 6/15

5:50 pm-12:30 pm

1 stop33h 40m

Sofia

Tue 8/19

1:15 pm-4:20 pm

1 stop36h 05m

$789

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 6/15

11:59 pm-12:00 pm

2 stops27h 01m

Sofia

Tue 8/19

1:15 pm-4:20 pm

1 stop36h 05m

$796

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 6/15

6:35 pm-7:10 pm

1 stop15h 35m

Sofia

Wed 8/20

9:30 pm-4:25 pm

1 stop27h 55m

$809

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 6/14

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

Wed 8/20

6:00 am-1:45 pm

1 stop16h 45m

$864

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 5/28

11:24 am-5:50 pm

2 stops21h 26m

Sofia

Tue 6/10

6:20 am-9:28 pm

2 stops24h 08m

$972

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 6/13

5:40 pm-6:10 pm

2 stops39h 30m

Sofia

Wed 8/20

6:55 pm-4:35 pm

2 stops30h 40m

$1,122

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 6/12

7:40 pm-12:55 pm

3 stops56h 15m

$460

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 9/10

6:35 pm-1:30 pm

1 stop33h 55m

$557

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 12 results
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 $632). Flying from Colorado to Bulgaria in June is currently the most expensive (average of $1,218). 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.

What is the cheapest time of day to fly from CO to BG?

Find hourly flight availability from Colorado to Bulgaria. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Bulgaria as you normally would.

Rainfall in Bulgaria by month

Plan your trip to Bulgaria by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Bulgaria ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Bulgaria when rainfall is around 1.2 in.

Temperature in Bulgaria by month

Plan your trip to Bulgaria by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Bulgaria, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Bulgaria

Get insights into the airlines that provide service to Bulgaria. 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 Bulgaria. Reviews last updated April 30, 2025.
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Boarding

7.6

Entertainment

6.7

Overall

7.6

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Austrian Airlines
7.6
Good
780 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Boarding

7.6

Entertainment

6.7

Overall

7.6

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
SWISS
7.5
Good
1,588 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Boarding

7.6

Entertainment

6.7

Overall

7.6

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
United Airlines
7.4
Good
8,696 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Boarding

7.6

Entertainment

6.7

Overall

7.6

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Turkish Airlines
7.3
Good
3,788 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Boarding

7.6

Entertainment

6.7

Overall

7.6

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
American Airlines
7.2
Good
10,000 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Boarding

7.6

Entertainment

6.7

Overall

7.6

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.

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.

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

    One-way options have recently been found by users for as low as $557 on American Airlines. Other airlines that offer cheap prices include Lufthansa from $805 and United Airlines from $823 one-way.

  • 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 $632). Flying from Colorado to Bulgaria in June is currently the most expensive (average of $1,218). 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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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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$531Average$854FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$687Average$967FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$759Average$1,200FlexibilityNo cancel feeOn-time76%

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