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

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $866.

What airlines fly to Sofia?

Turkish Airlines, United Airlines and Lufthansa are the top three most popular airlines that fly to Sofia from Denver according to our data. Turkish Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 3 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

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

Munich (MUC) has the shortest average layover time for this route: 3h 42m.

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

Lufthansa is the most popular carrier operating from Denver Intl to Sofia

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

Flights connecting via London (LHR) have the shortest average one-way travel time: 13h 50m.

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

Istanbul (IST) was the most common stop: 80% of momondo users choosing 1-stop flights on this route connected there.

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

Prices for flights from Denver Intl Airport to Sofia Airport were last updated today.

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

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

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The required travel and health documents for your Sofia 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 Sofia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$500 Cheap Flights from Denver to Sofia 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 Denver to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:20 pm - 8:45 amDEN-SOF

28h 25m1 stop

9:35 am - 6:35 pmSOF-DEN

17h 00m1 stop

$581Turkish Airlines

Find Deal

Sat, Mar 21 - Sat, Mar 28

5:20 pm - 6:20 pmDEN-SOF

17h 00m1 stop

12:50 pm - 2:20 pmSOF-DEN

34h 30m1 stop

$582United Airlines

Find Deal

Mon, Mar 23 - Mon, Mar 30

6:00 am - 1:00 pmDEN-SOF

23h 00m2 stops

12:50 pm - 2:20 pmSOF-DEN

34h 30m1 stop

$587United Airlines

Find Deal

Sun, Mar 22 - Mon, Mar 30

8:25 pm - 8:15 pmDEN-SOF

14h 50m1 stop

9:35 am - 6:20 pmSOF-DEN

17h 45m1 stop

$593Turkish Airlines

Find Deal

Thu, Apr 9 - Thu, Apr 23

5:54 pm - 1:35 pmDEN-SOF

35h 41m2 stops

12:50 pm - 2:20 pmSOF-DEN

34h 30m1 stop

$616Lufthansa

Find Deal

Sat, Mar 21 - Mon, Mar 30

6:25 pm - 11:15 amDEN-SOF

32h 50m1 stop

8:00 pm - 4:35 pmSOF-DEN

29h 35m1 stop

$618British Airways

Find Deal

Thu, Mar 19 - Mon, Mar 30

5:54 pm - 6:20 pmDEN-SOF

16h 26m2 stops

6:40 pm - 3:56 pmSOF-DEN

30h 16m2 stops

$620Lufthansa

Find Deal

Mon, Mar 23 - Mon, Mar 30

11:05 am - 6:40 pmDEN-SOF

22h 35m2 stops

6:10 am - 8:00 pmSOF-DEN

46h 50m2 stops

$635Air Canada

Find Deal

Thu, Apr 9 - Thu, Apr 23

6:25 pm - 4:20 pmDEN-SOF

13h 55m1 stop

12:05 pm - 4:35 pmSOF-DEN

36h 30m1 stop

$693British Airways

Find Deal

Sun, Mar 22 - Sat, Mar 28

11:15 am - 1:50 pmDEN-SOF

18h 35m2 stops

1:55 pm - 12:01 pmSOF-DEN

31h 06m2 stops

$698Air Canada

Find Deal

Thu, Mar 19 - Sun, Mar 29

Turkish Airlines flights from Denver to Sofia

Our best Turkish Airlines deals on Denver to Sofia flight tickets

Turkish Airlines

Mar 21

DEN8:20 pmDenver Intl

28h 25m

1 stop

SOF8:45 amSofia

Mar 28

SOF9:35 amSofia

17h 00m

1 stop

DEN6:35 pmDenver Intl

$581

Find similar

Turkish Airlines

Apr 9

DEN8:25 pmDenver Intl

14h 50m

1 stop

SOF8:15 pmSofia

Apr 23

SOF9:35 amSofia

17h 45m

1 stop

DEN6:20 pmDenver Intl

$593

Find similar

Turkish Airlines

Feb 12

DEN7:20 pmDenver Intl

16h 30m

1 stop

SOF8:50 pmSofia

Feb 20

SOF4:00 pmSofia

34h 35m

1 stop

DEN5:35 pmDenver Intl

$596

Find similar

United Airlines flights from Denver to Sofia

Our best United Airlines deals on Denver to Sofia flight tickets

United Airlines

Mar 23

DEN5:20 pmDenver Intl

17h 00m

1 stop

SOF6:20 pmSofia

Mar 30

SOF12:50 pmSofia

34h 30m

1 stop

DEN2:20 pmDenver Intl

$582

Find similar

United Airlines

Mar 22

DEN6:00 amDenver Intl

23h 00m

2 stops

SOF1:00 pmSofia

Mar 30

SOF12:50 pmSofia

34h 30m

1 stop

DEN2:20 pmDenver Intl

$587

Find similar

United Airlines

Mar 22

DEN6:45 pmDenver Intl

15h 15m

1 stop

SOF6:00 pmSofia

Mar 30

SOF12:50 pmSofia

34h 30m

1 stop

DEN2:20 pmDenver Intl

$595

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 3/21

8:20 pm-8:45 am

1 stop28h 25m

Sofia

Sat 3/28

9:35 am-6:35 pm

1 stop17h 00m

$581

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 3/23

5:20 pm-6:20 pm

1 stop17h 00m

Sofia

Mon 3/30

12:50 pm-2:20 pm

1 stop34h 30m

$582

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 3/22

6:00 am-1:00 pm

2 stops23h 00m

Sofia

Mon 3/30

12:50 pm-2:20 pm

1 stop34h 30m

$587

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 4/9

8:25 pm-8:15 pm

1 stop14h 50m

Sofia

Thu 4/23

9:35 am-6:20 pm

1 stop17h 45m

$593

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 3/21

5:54 pm-1:35 pm

2 stops35h 41m

Sofia

Mon 3/30

12:50 pm-2:20 pm

1 stop34h 30m

$616

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 3/19

6:25 pm-11:15 am

1 stop32h 50m

Sofia

Mon 3/30

8:00 pm-4:35 pm

1 stop29h 35m

$618

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 3/23

5:54 pm-6:20 pm

2 stops16h 26m

Sofia

Mon 3/30

6:40 pm-3:56 pm

2 stops30h 16m

$620

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 4/9

11:05 am-6:40 pm

2 stops22h 35m

Sofia

Thu 4/23

6:10 am-8:00 pm

2 stops46h 50m

$635

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 3/22

6:25 pm-4:20 pm

1 stop13h 55m

Sofia

Sat 3/28

12:05 pm-4:35 pm

1 stop36h 30m

$693

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 3/19

11:15 am-1:50 pm

2 stops18h 35m

Sofia

Sun 3/29

1:55 pm-12:01 pm

2 stops31h 06m

$698

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first

How to get the cheapest flight ticket from Denver to Sofia

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 Sofia?

The cheapest month to fly to Sofia from Denver is in April. Flight prices, which tend to average around $535, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of April, then book flights to Sofia from Denver during February instead. Flights to Sofia in February, while not as cheap as those in April, still average around $614.

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

According to our data, Thursday is the cheapest day to fly to Sofia from Denver. The lowest ticket price found for a Thursday departure recently was $781. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Denver to Sofia on a Saturday will generally be more expensive and average around $1,343. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

In the evening is the cheapest time of day to fly from Denver to Sofia when you can find flight prices for as low as $784. Flying to Sofia in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,319 per ticket.

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $866 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Denver for as low as $728 on momondo.

When to book flights from Denver to Sofia

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

Estimated round-trip price

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

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

Direct flights	None

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

Search flight deals

How far is Denver Intl to Sofia by plane?
There are 5884.6 mi between Denver Intl and Sofia. Typically, this will take 13h 55m by plane in normal conditions.
When did momondo last update prices for flights from Denver Intl Airport to Sofia Airport?
Prices for flights from Denver Intl Airport to Sofia Airport were last updated today.
How many operators does momondo search for flights from Denver Intl Airport to Sofia Airport?
As of October 2025, there are 3 operators available to choose from for flights from Denver Intl Airport to Sofia Airport.
How old do you have to be to fly from Denver Intl Airport to Sofia Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The required travel and health documents for your Sofia 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 Sofia 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 Denver to Sofia?
momondo data reveals that the most frequently booked airline on the route from Denver to Sofia is Turkish Airlines, representing 56% of all bookings. The subsequent popular airlines are United Airlines at 23% and Lufthansa at 21%.

Best airlines flying from Denver to Sofia

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

Airline	Rating	Free Cancellation	Price
Turkish Airlines	PriceFrom $522	Free Cancellation	Rating 7.3 4,033 reviews	Search Turkish Airlines flights
United Airlines	PriceFrom $656	Free Cancellation	Rating 7.4 8,996 reviews	Search United Airlines flights
Lufthansa	PriceFrom $672	Free Cancellation	Rating 6.8 7,542 reviews	Search Lufthansa flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

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

It is quick and easy to find Denver to Sofia flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Sofia that suits you.

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

Yes. All flights to Sofia from Denver on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sofia from Denver.

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

If you are not ready to book a flight from Denver to Sofia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Sofia and let you know when they change.

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Sat 11/29

Sat 12/6

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Cheap flights from Denver to Sofia from $500

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Sofia departing on 12/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Denver to Sofia

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Turkish Airlines flights from Denver to Sofia

Our best Turkish Airlines deals on Denver to Sofia flight tickets

United Airlines flights from Denver to Sofia

Our best United Airlines deals on Denver to Sofia flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Denver to Sofia that are best for you.

See travel insights to Sofia from

How to get the cheapest flight ticket from Denver to Sofia

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

What is the cheapest month to fly to Sofia?

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

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

How far in advance should I book a flight to Sofia?

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

Lufthansa is the most popular carrier operating from Denver Intl to Sofia

What airlines fly to Sofia?

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

Istanbul (IST) was the most common stop: 80% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $866.

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

Flights connecting via London (LHR) have the shortest average one-way travel time: 13h 50m.

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

Munich (MUC) has the shortest average layover time for this route: 3h 42m.

When to book flights from Denver to Sofia

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

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

Direct flights

How far is Denver Intl to Sofia by plane?

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

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

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

What documentation or ID do you need to fly to Sofia Airport?

What is the most popular airline from Denver to Sofia?

Best airlines flying from Denver to Sofia

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

Traveling to a place near Sofia?

Why use momondo?

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

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

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

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

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo