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$448+ Cheap flights from Sofia (SOF) 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$820
(United Airlines)

One-way from

$448
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$783
From Sofia to Colorado
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One-way flight from Sofia to Colorado
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Highest demand for flights based on searches. 5% potential increase in price ($49 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 15, 2025.

This United Airlines deal was found by Cheapflights users on 9/13. 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 10/16:15 amSOF - DEN
1 stop16h 20mUnited Airlines
Wed 10/88:20 pmDEN - SOF
1 stop17h 40mUnited Airlines
Deal found 9/13$820
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/146:20 amSOF - DEN
2 stops26h 37mUnited Airlines
Tue 10/218:20 pmDEN - SOF
1 stop17h 40mUnited Airlines
Deal found 9/14$827
This Expedia deal was found by Cheapflights users on 9/14. 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.
Tue 10/146:35 pmSOF - DEN
1 stop28h 00mLufthansa
Tue 10/218:20 pmDEN - SOF
1 stop13h 20mLufthansa
Deal found 9/14$840
This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/144:05 pmSOF - DEN
3 stops30h 40mMultiple Airlines
Tue 10/2111:15 amDEN - SOF
3 stops21h 40mMultiple Airlines
Deal found 9/14$1,060

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 September 15, 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

Wed 10/1

6:15 am-1:35 pm

1 stop16h 20m

Denver Intl

Wed 10/8

8:20 pm-11:00 pm

1 stop17h 40m

$820

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 10/14

6:20 am-11:57 pm

2 stops26h 37m

Denver Intl

Tue 10/21

8:20 pm-11:00 pm

1 stop17h 40m

$827

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 10/14

6:35 pm-1:35 pm

1 stop28h 00m

Denver Intl

Tue 10/21

8:20 pm-6:40 pm

1 stop13h 20m

$840

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 10/14

4:05 pm-1:45 pm

3 stops30h 40m

Denver Intl

Tue 10/21

11:15 am-5:55 pm

3 stops21h 40m

$1,060

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 11/10

4:35 pm-6:26 pm

3 stops58h 51m

$448

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Mon 11/10

5:25 pm-3:30 pm

1 stop31h 05m

$512

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sun 9/21

11:55 am-10:48 pm

3 stops43h 53m

$565

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 9/20

8:00 pm-8:30 am

3 stops45h 30m

$581

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 11/11

6:00 am-4:00 pm

1 stop19h 00m

$713

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 9/20

6:00 am-1:45 pm

1 stop16h 45m

$863

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 11 results
1
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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, October is the cheapest month in which you can book a flight from Sofia to Colorado (average of $197). Flying from Sofia to Colorado in March is currently the most expensive (average of $278). 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 September 15, 2025.

When flying from Sofia to Colorado, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 September 15, 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
8,929 reviews

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Turkish Airlines
7.3
Good
3,968 reviews
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Lufthansa
6.8
Okay
7,407 reviews
United Airlines
7.4
Good
8,929 reviews

Entertainment

7.1

Crew

8.1

Comfort

7.3

Overall

7.4

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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, United Airlines can have you in Colorado from Sofia in 16h 20m. Airlines will cover a distance of 5871 mi.

  • 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, October is the cheapest month in which you can book a flight from Sofia to Colorado (average of $197). Flying from Sofia to Colorado in March is currently the most expensive (average of $278). 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$639Average$803FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$781FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$737Average$1,008FlexibilityNo cancel feeOn-time76%

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