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$820+ Cheap flights from Sofia (SOF) to Colorado

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Sofia to Colorado

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

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$820
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$884
Provider with most accurate pricing for Sofia-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Sofia-Denver Intl flights.
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From Sofia to Colorado
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Highest demand for flights based on searches. 4% potential increase in price ($37 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Sofia to Colorado

Cheapest flights from Sofia to Colorado
Explore the most affordable flight options available from Sofia to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:10 amSOF - DEN
1 stop16h 30mLufthansa
Sun 11/163:55 pmDEN - SOF
1 stop12h 40mLufthansa
Deal found 10/28$820
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Mon 11/106:10 amSOF - DEN
1 stop18h 50mUnited Airlines
Sun 11/168:20 pmDEN - SOF
1 stop13h 00mUnited Airlines
Deal found 10/29$834
This Lufthansa deal was found by Cheapflights users on 10/29. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:00 amSOF - DEN
1 stop16h 40mLufthansa
Thu 11/271:25 pmDEN - SOF
2 stops14h 50mLufthansa
Deal found 10/29$835
This Air Canada deal was found by Cheapflights users on 10/29. 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.
Thu 11/206:00 amSOF - DEN
2 stops22h 55mAir Canada
Thu 11/2711:44 amDEN - SOF
2 stops21h 16mAir Canada
Deal found 10/29$836
This Air Canada deal was found by Cheapflights users on 10/30. 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 11/206:00 amSOF - DEN
2 stops35h 53mMultiple Airlines
Thu 11/2711:44 amDEN - SOF
2 stops21h 16mMultiple Airlines
Deal found 10/30$837
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Thu 11/206:00 amSOF - DEN
1 stop16h 40mUnited Airlines
Thu 11/271:25 pmDEN - SOF
2 stops24h 20mUnited Airlines
Deal found 10/30$840
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/96:10 amSOF - DEN
2 stops26h 26mUnited Airlines
Sat 11/158:20 pmDEN - SOF
1 stop17h 25mUnited Airlines
Deal found 10/28$843
This British Airways deal was found by Cheapflights users on 10/29. 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.
Mon 11/105:25 pmSOF - DEN
2 stops35h 52mBritish Airways
Sun 11/165:25 pmDEN - SOF
1 stop13h 55mBritish Airways
Deal found 10/29$880
This United Airlines deal was found by Cheapflights users on 10/30. 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.
Sun 12/216:05 amSOF - DEN
2 stops39h 13mUnited Airlines
Sat 1/174:20 pmDEN - SOF
1 stop17h 00mUnited Airlines
Deal found 10/30$917
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:05 amSOF - ASE
2 stops21h 23mLufthansa
Mon 11/173:34 pmASE - SOF
2 stops17h 46mLufthansa
Deal found 10/28$1,204
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 11/136:05 amSOF - ASE
2 stops23h 03mUnited Airlines
Mon 11/1711:35 amASE - SOF
3 stops16h 40mUnited Airlines
Deal found 10/28$1,219

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia 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 October 30, 2025.
Use the filters below to find and compare flights from Sofia to Colorado that are best for you.

Fly from

Sofia

Fly to

Colorado

Route

Depart

Return

Price

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 11/10

6:10 am-1:40 pm

1 stop16h 30m

Denver Intl

Sun 11/16

3:55 pm-1:35 pm

1 stop12h 40m

$820

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 11/20

6:00 am-1:40 pm

1 stop16h 40m

Denver Intl

Thu 11/27

8:20 pm-10:45 pm

1 stop17h 25m

$834

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 11/10

6:10 am-4:00 pm

1 stop18h 50m

Denver Intl

Sun 11/16

8:20 pm-6:20 pm

1 stop13h 00m

$834

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 11/20

6:00 am-1:40 pm

1 stop16h 40m

Denver Intl

Thu 11/27

1:25 pm-1:15 pm

2 stops14h 50m

$835

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 11/9

6:10 am-11:36 pm

2 stops26h 26m

Denver Intl

Sat 11/15

8:20 pm-10:45 pm

1 stop17h 25m

$843

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 11/10

5:25 pm-8:17 pm

2 stops35h 52m

Denver Intl

Sun 11/16

5:25 pm-4:20 pm

1 stop13h 55m

$880

SofiaAspen

SOF - ASE

SOFASE

Sofia

Thu 11/13

6:05 am-6:28 pm

2 stops21h 23m

Aspen Pitkin County

Mon 11/17

3:34 pm-6:20 pm

2 stops17h 46m

$1,204

SofiaAspen

SOF - ASE

SOFASE

Sofia

Fri 3/27

6:05 am-8:56 am

2 stops34h 51m

Aspen Pitkin County

Tue 3/31

1:00 pm-6:40 pm

2 stops20h 40m

$1,216

SofiaAspen

SOF - ASE

SOFASE

Sofia

Thu 11/13

6:05 am-8:08 pm

2 stops23h 03m

Aspen Pitkin County

Mon 11/17

11:35 am-1:15 pm

3 stops16h 40m

$1,219

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Best time to book a flight from Sofia to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Sofia 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 Sofia to Colorado

What is the cheapest month to book a flight from Sofia to Colorado?

Currently, December is the cheapest month in which you can book a flight from Sofia to Colorado (average of $711). Flying from Sofia to Colorado in August is currently the most expensive (average of $834). 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 SOF to CO?

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

When flying from Sofia to Colorado, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 24% versus a flight at noon.

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 October 30, 2025.
Peruse reviews from past customers who have flown with United Airlines, Turkish Airlines, and Lufthansa from Sofia to Colorado to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,996 reviews

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
8,996 reviews
United Airlines
7.4
Good
8,996 reviews

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Turkish Airlines
7.3
Good
4,033 reviews
United Airlines
7.4
Good
8,996 reviews

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Lufthansa
6.8
Okay
7,542 reviews
United Airlines
7.4
Good
8,996 reviews

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

Find useful and relevant information for your journey from Sofia to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Sofia to Colorado?

    For a flight from Sofia to Colorado, you will be flying from Sofia. Sofia (SOF) is just 4.2 mi from the center of the city.

  • How long is the flight from Sofia to Colorado?

    For as low as $820, Lufthansa can have you in Colorado from Sofia in 16h 30m. Airlines will cover a distance of 5871 mi. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sofia 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.

  • What is the cheapest month to book a flight from Sofia to Colorado?

    Currently, December is the cheapest month in which you can book a flight from Sofia to Colorado (average of $711). Flying from Sofia to Colorado in August is currently the most expensive (average of $834). 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 Sofia to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Sofia to Colorado

Discover the top 3 airlines that operate flights from Sofia 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$704Average$803FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$792FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$745Average$1,000FlexibilityNo cancel feeOn-time76%

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