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Sofia

$289+ 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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$600
(United Airlines)

One-way from

$289
(Kiwi.com)

Popular in

May

Cheapest in

April

Average price

$1,265
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. 8% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/148:20 pmDEN - SOF
1 stop17h 40mUnited Airlines
Thu 3/126:00 amSOF - DEN
1 stop16h 40mUnited Airlines
Deal found 7/30$600
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.
Tue 8/127:50 pmDEN - SOF
1 stop27h 45mTurkish Airlines
Thu 9/189:15 pmSOF - DEN
1 stop29h 40mTurkish Airlines
Deal found 7/30$604
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/144:15 pmDEN - SOF
1 stop21h 45mLufthansa
Mon 3/91:55 pmSOF - DEN
1 stop33h 40mLufthansa
Deal found 7/30$613
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.
Sun 9/149:58 amDEN - SOF
2 stops16h 17mAir Canada
Fri 3/132:35 pmSOF - DEN
2 stops27h 48mAir Canada
Deal found 7/30$618
This Ovago 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:06 pmDEN - SOF
2 stops18h 34mBritish Airways
Wed 3/119:00 pmSOF - DEN
1 stop27h 30mBritish Airways
Deal found 7/30$677

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 July 31, 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

Sun 9/14

8:20 pm-11:00 pm

1 stop17h 40m

Sofia

Wed 3/11

6:15 am-7:55 pm

2 stops21h 40m

$600

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 8/12

7:50 pm-8:35 am

1 stop27h 45m

Sofia

Thu 9/18

9:15 pm-5:55 pm

1 stop29h 40m

$604

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 9/14

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

Mon 3/9

1:55 pm-3:35 pm

1 stop33h 40m

$613

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 9/14

9:58 am-11:15 am

2 stops16h 17m

Sofia

Fri 3/13

2:35 pm-10:23 am

2 stops27h 48m

$618

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 9/16

5:06 pm-8:40 pm

2 stops18h 34m

Sofia

Wed 3/11

9:00 pm-4:30 pm

1 stop27h 30m

$677

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 10/9

10:55 pm-1:35 pm

2 stops53h 40m

$289

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 10/9

7:50 pm-8:25 pm

1 stop15h 35m

$498

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 12/5

5:25 pm-1:00 pm

1 stop34h 35m

$518

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 8/28

5:59 pm-10:50 pm

1 stop19h 51m

$729

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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 $1,187). 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 July 31, 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.

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. 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 Sofia. Reviews last updated July 31, 2025.
See what other customers who have flown with United Airlines, Turkish Airlines, and Air Canada from Colorado to Sofia have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,900 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,900 reviews
United Airlines
7.4
Good
8,900 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Turkish Airlines
7.3
Good
3,933 reviews
United Airlines
7.4
Good
8,900 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.1
Good
9,851 reviews
United Airlines
7.4
Good
8,900 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,275 reviews
United Airlines
7.4
Good
8,900 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.6
Okay
7,222 reviews
United Airlines
7.4
Good
8,900 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

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

    The cheapest airlines for a one-way flight from Colorado to Sofia are Turkish Airlines ($498), British Airways ($518), and Lufthansa ($729).

  • 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 $1,187). 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$522Average$753FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$646Average$1,166FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$653Average$857FlexibilityNo cancel feeOn-time69%

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