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$298+ Cheap flights from Colorado to Sofia (SOF)

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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Okt 16 — Okt 231
Do 10/16
Do 10/23
1 adult, Economy
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Cheap flight deals from Colorado to Sofia

Keep the following information in mind while searching for Colorado to Sofia flight deals. Data was last updated September 16, 2025.

Round-trip from

$558
(British Airways)

One-way from

$298
(Kiwi.com)

Popular in

May

Cheapest in

April

Average price

$645
From Colorado to Sofia
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One-way flight from Colorado to Sofia
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Highest demand for flights based on searches. 11% potential increase in price ($110 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 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 Colorado to Sofia

Cheapest flights from Colorado to Sofia
Explore the most affordable flight options available from Colorado to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This British Airways deal was found by Cheapflights users on 9/15. 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.
So 10/266:25 pmDEN - SOF
1 stop13h 55mBritish Airways
Mo 11/105:25 pmSOF - DEN
1 stop31h 05mBritish Airways
Deal found 9/15$558
This British Airways 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
So 10/266:25 pmDEN - SOF
1 stop13h 55mBritish Airways
Mi 11/59:00 pmSOF - DEN
1 stop27h 30mBritish Airways
Deal found 9/14$568
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 10/288:20 pmDEN - SOF
1 stop34h 50mTurkish Airlines
Sa 11/810:05 amSOF - DEN
1 stop16h 30mTurkish Airlines
Deal found 9/14$575
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 11/311:59 pmDEN - SOF
2 stops35h 11mAmerican Airlines
Mi 11/129:00 pmSOF - DEN
2 stops34h 22mAmerican Airlines
Deal found 9/14$587
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 10/295:25 pmDEN - SOF
2 stops16h 55mLufthansa
Di 11/116:00 amSOF - DEN
1 stop19h 00mLufthansa
Deal found 9/14$605
This British Airways deal was found by Cheapflights users on 9/15. 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.
So 10/266:25 pmDEN - SOF
1 stop13h 55mBritish Airways
Sa 11/812:05 pmSOF - DEN
1 stop36h 25mBritish Airways
Deal found 9/15$608
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 10/286:45 pmDEN - SOF
1 stop15h 30mLufthansa
Di 11/116:00 amSOF - DEN
1 stop19h 00mLufthansa
Deal found 9/14$617
This British Airways deal was found by Cheapflights users on 9/16. 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.
Di 10/286:25 pmDEN - SOF
1 stop17h 45mBritish Airways
So 11/92:30 pmSOF - DEN
1 stop34h 00mBritish Airways
Deal found 9/16$618
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Mo 10/275:20 pmDEN - SOF
1 stop17h 00mUnited Airlines
Fr 11/76:10 amSOF - DEN
1 stop16h 30mUnited Airlines
Deal found 9/15$621

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Sofia 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 16, 2025.
Use the filters below to find and compare flights from Colorado to Sofia that are best for you.

Fly from

Colorado

Fly to

Sofia

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Di 10/28

6:25 pm-8:10 pm

1 stop17h 45m

Sofia

Mo 11/10

5:25 pm-3:30 pm

1 stop31h 05m

$558

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Di 10/28

8:20 pm-9:15 am

1 stop28h 55m

Sofia

Sa 11/8

10:05 am-5:35 pm

1 stop16h 30m

$598

DenverSofia

DEN - SOF

DENSOF

Denver Intl

So 10/26

6:25 pm-4:20 pm

1 stop13h 55m

Sofia

So 11/9

2:30 pm-3:30 pm

1 stop34h 00m

$608

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Do 10/30

6:25 pm-11:15 am

1 stop32h 50m

Sofia

Mo 11/10

5:25 pm-3:30 pm

1 stop31h 05m

$608

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Do 10/30

6:25 pm-11:15 am

1 stop32h 50m

Sofia

Mi 11/5

9:00 pm-3:30 pm

1 stop27h 30m

$608

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Di 10/28

6:25 pm-8:10 pm

1 stop17h 45m

Sofia

Sa 11/8

12:05 pm-3:30 pm

1 stop36h 25m

$608

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mi 10/29

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Di 11/11

6:00 am-4:00 pm

1 stop19h 00m

$613

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Di 10/28

6:25 pm-8:10 pm

1 stop17h 45m

Sofia

So 11/9

2:30 pm-3:30 pm

1 stop34h 00m

$618

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mi 10/29

5:20 pm-10:45 pm

1 stop21h 25m

Sofia

Do 11/6

6:00 am-7:55 pm

2 stops22h 55m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mi 9/24

8:00 am-2:30 am

3 stops57h 30m

$298

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 15 results
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Best time to book a flight from Colorado to Sofia

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

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

Currently, November is the cheapest month in which you can book a flight from Colorado to Sofia (average of $632). Flying from Colorado to Sofia in June is currently the most expensive (average of $1,185). 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 SOF?

Find hourly flight availability from Colorado to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

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

Related info for your journey

Find useful and relevant information for your journey from Colorado to Sofia. 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 into for flights to Sofia from Colorado?

    If you book a flight to Sofia from Colorado, you will be flying to Sofia, which is the city’s only airport. Sofia (SOF) is located 4.2 mi from the center of Sofia.

  • How long is the flight from Colorado to Sofia?

    Airlines like British Airways and Turkish Airlines fly from Colorado to Sofia in about 17h 45m. The time it takes to get you to your destination can typically vary by up to 11h 10m. Colorado and Sofia 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 Sofia that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Colorado to Sofia 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 Sofia?

    Currently, November is the cheapest month in which you can book a flight from Colorado to Sofia (average of $632). Flying from Colorado to Sofia in June is currently the most expensive (average of $1,185). 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 Sofia

Discover the top 3 airlines that operate flights from Colorado to Sofia. 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$522Average$644FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$672Average$1,211FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$674Average$870FlexibilityNo cancel feeOn-time69%

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