HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Denver

$680+ Cheap flights from Sofia (SOF) to Denver (DEN)

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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — DEN
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Sofia to Denver with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Sofia to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated septiembre 11, 2025.

Round-trip from

$680
(oojo)

Popular in

May

Cheapest in

November

Average price

$768
From Sofia to Denver Intl
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Sofia to Denver

Cheapest flights from Sofia to Denver
Explore the most affordable flight options available from Sofia to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This oojo deal was found by Cheapflights users on 9/10. 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.
sáb. 11/110:05 amSOF - DEN
1 stop16h 30mTurkish Airlines
jue. 11/67:20 pmDEN - SOF
1 stop28h 55mTurkish Airlines
Deal found 9/10$680
This United Airlines deal was found by Cheapflights users on 9/10. 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.
mié. 10/16:15 amSOF - DEN
2 stops22h 14mUnited Airlines
mié. 10/88:20 pmDEN - SOF
1 stop17h 40mUnited Airlines
Deal found 9/10$831
This United Airlines deal was found by Cheapflights users on 9/10. 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.
vie. 9/266:00 amSOF - DEN
1 stop21h 40mUnited Airlines
mar. 10/289:20 pmDEN - SOF
1 stop13h 00mUnited Airlines
Deal found 9/10$832
This oojo deal was found by Cheapflights users on 9/10. 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.
vie. 9/263:35 pmSOF - DEN
1 stop35h 20mTurkish Airlines
mar. 10/288:20 pmDEN - SOF
1 stop34h 50mTurkish Airlines
Deal found 9/10$834
This KLM deal was found by Cheapflights users on 9/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/17:00 amSOF - DEN
2 stops19h 56mMultiple Airlines
jue. 11/610:24 amDEN - SOF
2 stops18h 31mMultiple Airlines
Deal found 9/10$847
This Orbitz deal was found by Cheapflights users on 9/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/266:55 pmSOF - DEN
2 stops30h 40mMultiple Airlines
mar. 10/286:35 pmDEN - SOF
2 stops36h 40mMultiple Airlines
Deal found 9/10$863
This Air France deal was found by Cheapflights users on 9/11. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/17:00 amSOF - DEN
2 stops22h 41mAir France
jue. 11/64:47 pmDEN - SOF
2 stops36h 08mAir France
Deal found 9/11$950

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Denver 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 septiembre 11, 2025.
Use the filters below to find and compare flights from Sofia to Denver that are best for you.

Fly from

Sofia

Fly to

Denver

Route

Depart

Return

Price

SofiaDenver

SOF - DEN

SOFDEN

Sofia

mié. 10/1

6:15 am-7:29 pm

2 stops22h 14m

Denver Intl

mié. 10/8

8:20 pm-11:00 pm

1 stop17h 40m

$831

SofiaDenver

SOF - DEN

SOFDEN

Sofia

vie. 9/26

6:00 am-6:40 pm

1 stop21h 40m

Denver Intl

mar. 10/28

9:20 pm-6:20 pm

1 stop13h 00m

$832

SofiaDenver

SOF - DEN

SOFDEN

Sofia

vie. 9/26

3:35 pm-5:55 pm

1 stop35h 20m

Denver Intl

mar. 10/28

8:20 pm-3:10 pm

1 stop34h 50m

$834

SofiaDenver

SOF - DEN

SOFDEN

Sofia

sáb. 11/1

7:00 am-6:56 pm

2 stops19h 56m

Denver Intl

jue. 11/6

10:24 am-1:55 pm

2 stops18h 31m

$847

SofiaDenver

SOF - DEN

SOFDEN

Sofia

vie. 9/26

6:55 pm-4:35 pm

2 stops30h 40m

Denver Intl

mar. 10/28

6:35 pm-3:15 pm

2 stops36h 40m

$863

SofiaDenver

SOF - DEN

SOFDEN

Sofia

sáb. 11/1

7:00 am-9:41 pm

2 stops22h 41m

Denver Intl

jue. 11/6

4:47 pm-1:55 pm

2 stops36h 08m

$950

SofiaDenver

SOF - DEN

SOFDEN

Sofia

sáb. 11/1

10:05 am-6:35 pm

1 stop16h 30m

Denver Intl

jue. 11/6

11:51 am-3:10 pm

2 stops18h 19m

$1,018

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Best time to book a flight from Sofia to Denver

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

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

Currently, October is the cheapest month in which you can book a flight from Sofia to Denver (average of $197). Flying from Sofia to Denver 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 DEN?

Find hourly flight availability from Sofia to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 11, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 16% on flights from Sofia to Denver by exploring options for tickets in the afternoon.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated septiembre 11, 2025.
Get a feel of what it's like to fly with United Airlines, Turkish Airlines, and Lufthansa from Sofia to Denver by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

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
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

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
8,937 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

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
7,409 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

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 Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Sofia to Denver?

    A quick flight from Sofia to Denver can take about 22h 14m. United Airlines provides one of the quickest options available for as low as $831. The distance from Sofia to Denver is about 5871 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Sofia to Denver round-trip?

    Turkish Airlines, at $639, was found to be the cheapest airline from Sofia to Denver.Alternate airlines to your destination round-trip include United Airlines and Lufthansa. Turkish Airlines is priced at 22% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Sofia to Denver (average of $197). Flying from Sofia to Denver 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

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Westminster
Black Hawk
Golden
Winter Park
Broomfield
Greeley
Lone Tree
Lakewood
Cripple Creek
Thornton
Silverthorne
Frisco
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Sofia to Denver

Discover the top 3 airlines that operate flights from Sofia to Denver. 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$639Average$807FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$729Average$763FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$737Average$1,008FlexibilityNo cancel feeOn-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.