What airlines fly to Denver?

Lufthansa, Turkish Airlines and United Airlines are the top three most popular airlines that fly to Denver from Sofia according to our data. Lufthansa is the first choice among our users, with 49% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 3 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest travel time from Sofia to Denver?

Flights connecting via Istanbul (IST) have the shortest average one-way travel time: 17h 03m.

Which airport is the most popular layover for flights between Sofia and Denver?

Istanbul (IST) was the most common stop: 64% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Sofia to Denver?

Istanbul (IST) has the shortest average layover time for this route: 2h 48m.

Which layover airport offers the lowest fares from Sofia to Denver?

Flights via Munich (MUC) offer the lowest average round-trip price of $766.

What is the cheapest airline that flies from Sofia to Denver Intl?

Lufthansa and United Airlines are the most popular carriers operating from Sofia to Denver Intl

When did momondo last update prices for flights from Sofia Airport to Denver Intl Airport?

Prices for flights from Sofia Airport to Denver Intl Airport refresh daily.

How many operators does momondo search for flights from Sofia Airport to Denver Intl Airport?

As of December 2025, there are 3 operators available to choose from for flights from Sofia Airport to Denver Intl Airport.

How old do you have to be to fly from Sofia Airport to Denver Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Sofia Airport to Denver Intl Airport.

What documentation or ID do you need to fly to Denver Intl Airport?

The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$638 Cheap Flights from Sofia to Denver in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Sofia to Denver

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 1:40 pm

SOF

DEN

16h 40m1 stop

11:15 am - 1:15 pm

DEN

SOF

17h 00m2 stops

$825Lufthansa

Thu, Jan 22 - Wed, Jan 28

6:00 am - 1:40 pm

SOF

DEN

16h 40m1 stop

4:20 pm - 6:20 pm

DEN

SOF

17h 00m1 stop

$840Lufthansa

Thu, Jan 22 - Wed, Jan 28

6:00 am - 7:55 pm

SOF

DEN

22h 55m2 stops

1:25 pm - 3:15 pm

DEN

SOF

16h 50m2 stops

$858Multiple Airlines

Thu, Jan 22 - Wed, Jan 28

6:10 am - 1:40 pm

SOF

DEN

16h 30m1 stop

4:20 pm - 10:45 pm

DEN

SOF

21h 25m1 stop

$860Lufthansa

Fri, Jan 16 - Thu, Jan 22

6:05 am - 2:35 pm

SOF

DEN

17h 30m1 stop

11:20 am - 1:15 pm

DEN

SOF

16h 55m2 stops

$861Lufthansa

Tue, Dec 23 - Thu, Jan 22

6:00 am - 12:15 am

SOF

DEN

27h 15m2 stops

11:20 am - 10:45 pm

DEN

SOF

26h 25m2 stops

$864United Airlines

Tue, Dec 23 - Thu, Jan 22

6:10 am - 5:44 pm

SOF

DEN

20h 34m2 stops

11:15 am - 1:50 pm

DEN

SOF

17h 35m2 stops

$865Air Canada

Fri, Jan 16 - Thu, Jan 22

6:25 am - 7:25 pm

SOF

DEN

22h 00m2 stops

9:40 am - 1:15 pm

DEN

SOF

18h 35m2 stops

$866United Airlines

Sat, Jan 24 - Sat, Jan 31

6:05 am - 2:35 pm

SOF

DEN

17h 30m1 stop

4:20 pm - 10:45 pm

DEN

SOF

21h 25m1 stop

$873Lufthansa

Sat, Jan 24 - Sat, Jan 31

6:10 am - 7:26 pm

SOF

DEN

22h 16m2 stops

11:20 am - 1:50 pm

DEN

SOF

17h 30m2 stops

$875United Airlines

Fri, Jan 16 - Thu, Jan 22

United Airlines flights from Sofia to Denver

Our best United Airlines deals on Sofia to Denver flight tickets

United Airlines

Jan 16

SOF6:10 amSofia

16h 30m

1 stop

DEN1:40 pmDenver Intl

Jan 22

DEN1:31 pmDenver Intl

24h 14m

2 stops

SOF10:45 pmSofia

$864

Find similar

United Airlines

Jan 24

SOF6:25 amSofia

22h 00m

2 stops

DEN7:25 pmDenver Intl

Jan 31

DEN9:40 amDenver Intl

18h 35m

2 stops

SOF1:15 pmSofia

$866

Find similar

United Airlines

Jan 16

SOF6:10 amSofia

22h 16m

2 stops

DEN7:26 pmDenver Intl

Jan 22

DEN11:20 amDenver Intl

17h 30m

2 stops

SOF1:50 pmSofia

$875

Find similar

Lufthansa flights from Sofia to Denver

Our best Lufthansa deals on Sofia to Denver flight tickets

Lufthansa

Jan 16

SOF6:10 amSofia

16h 30m

1 stop

DEN1:40 pmDenver Intl

Jan 22

DEN11:20 amDenver Intl

16h 55m

2 stops

SOF1:15 pmSofia

$827

Find similar

Lufthansa

Jan 16

SOF6:10 amSofia

16h 30m

1 stop

DEN1:40 pmDenver Intl

Jan 22

DEN4:20 pmDenver Intl

21h 25m

1 stop

SOF10:45 pmSofia

$860

Find similar

Lufthansa

Dec 23

SOF6:05 amSofia

17h 30m

1 stop

DEN2:35 pmDenver Intl

Jan 22

DEN11:20 amDenver Intl

16h 55m

2 stops

SOF1:15 pmSofia

$861

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 1/22

6:00 am-1:40 pm

1 stop16h 40m

Denver Intl

Wed 1/28

11:15 am-1:15 pm

2 stops17h 00m

$825

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 1/22

6:00 am-1:40 pm

1 stop16h 40m

Denver Intl

Wed 1/28

4:20 pm-6:20 pm

1 stop17h 00m

$840

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Thu 1/22

6:00 am-7:55 pm

2 stops22h 55m

Denver Intl

Wed 1/28

1:25 pm-3:15 pm

2 stops16h 50m

$858

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 1/16

6:10 am-1:40 pm

1 stop16h 30m

Denver Intl

Thu 1/22

4:20 pm-10:45 pm

1 stop21h 25m

$860

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 12/23

6:05 am-2:35 pm

1 stop17h 30m

Denver Intl

Thu 1/22

11:20 am-1:15 pm

2 stops16h 55m

$861

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Tue 12/23

6:00 am-12:15 am

2 stops27h 15m

Denver Intl

Thu 1/22

11:20 am-10:45 pm

2 stops26h 25m

$864

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 1/16

6:10 am-5:44 pm

2 stops20h 34m

Denver Intl

Thu 1/22

11:15 am-1:50 pm

2 stops17h 35m

$865

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 1/24

6:25 am-7:25 pm

2 stops22h 00m

Denver Intl

Sat 1/31

9:40 am-1:15 pm

2 stops18h 35m

$866

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Sat 1/24

6:05 am-2:35 pm

1 stop17h 30m

Denver Intl

Sat 1/31

4:20 pm-10:45 pm

1 stop21h 25m

$873

SofiaDenver

SOF - DEN

SOFDEN

Sofia

Fri 1/16

6:10 am-7:26 pm

2 stops22h 16m

Denver Intl

Thu 1/22

11:20 am-1:50 pm

2 stops17h 30m

$875

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Sofia to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the cheapest month to fly to Denver?

The cheapest month to fly to Denver from Sofia is in February. Flight prices, which tend to average around $745, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in February, then you should wait until March to fly from Sofia, when ticket prices are also cheap, with an average price of $755.

What is the cheapest day to depart on your flight to Denver?

The cheapest day to depart on your flight to Denver is on a Friday when prices can be found for as low as $778. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Thursday, with ticket prices averaging around $972.

What is the cheapest time of day to depart on your flight to Denver?

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $691. Flights in the morning are often more expensive with an average ticket price of $816.

Can stopping save me money on Sofia to Denver flights?

You could potentially save up to 23% on your flight if you consider stops on a Sofia to Denver flight.

When to book flights from Sofia to Denver

Are you open to changing your travel dates? Check out the ideal times to fly from Sofia to Denver according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Sofia to Denver (SOF to DEN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Sofia to Denver

Fastest flight time	17h 30m
Direct flights	None

The fastest flight from Sofia to Denver takes 17h 30m

There are no direct flights from Sofia to Denver. There are no popular flight routes from Sofia to Denver.

Search flight deals

How far is Sofia to Denver Intl by plane?
The straight-line distance from Sofia to Denver Intl is 5884.6 mi. Typically, this will take 17h 30m by plane in normal conditions.
When did momondo last update prices for flights from Sofia Airport to Denver Intl Airport?
Prices for flights from Sofia Airport to Denver Intl Airport refresh daily.
How many operators does momondo search for flights from Sofia Airport to Denver Intl Airport?
As of December 2025, there are 3 operators available to choose from for flights from Sofia Airport to Denver Intl Airport.
How old do you have to be to fly from Sofia Airport to Denver Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Sofia Airport to Denver Intl Airport.
What documentation or ID do you need to fly to Denver Intl Airport?
The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Sofia to Denver?
Based on momondo bookings for flights between Sofia and Denver, the leading airline is Lufthansa, making up 49% of the total bookings. Other popular airlines include Turkish Airlines with 26% and United Airlines with 25%.

Best airlines flying from Sofia to Denver

Compare and see reviews for airlines that fly from Sofia to Denver with momondo

Airline	Rating	Free Cancellation	Price
Turkish Airlines	PriceFrom $704	Free Cancellation	Rating 7.3 4,089 reviews	Search Turkish Airlines flights
United Airlines	PriceFrom $729	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights
Lufthansa	PriceFrom $749	Free Cancellation	Rating 6.8 7,626 reviews	Search Lufthansa flights

Breckenridge

Estes Park

Black Hawk

Aurora

Fort Collins

Keystone

Cripple Creek

Manitou Springs

Longmont

Boulder

Greeley

Lakewood

Thornton

Westminster

Winter Park

Copper Mountain

Silverthorne

Frisco

Centennial

Grand Lake

Why use momondo?

Why should I use momondo to find a flight deal from Sofia to Denver?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Sofia to Denver. momondo saves you time and could save you money on your trip.

Can I find flights from Sofia to Denver with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Sofia to Denver flights to just show those with flexible booking policies.

How can momondo help me find flights from Sofia to Denver?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Sofia to Denver.

I’m not ready to book a flight from Sofia to Denver right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Denver from Sofia. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.