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

Istanbul (IST) has the shortest average layover time for this route: 4h 05m.

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 36% 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 offers the lowest fares from Denver to Sofia?

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $877.

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

Flights connecting via Istanbul (IST) have the shortest average one-way travel time: 16h 16m.

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

Munich (MUC) was the most common stop: 51% of momondo users choosing 1-stop flights on this route connected there.

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

Air Canada, British Airways, and United Airlines are the most popular carriers operating from Denver Intl to Sofia

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 2026, 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.

$329 Cheap Flights from Denver to Sofia in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Denver to Sofia

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:30 pm - 3:10 pmDEN Denver Intl-SOF Sofia

34h 40m1 stop Istanbul

9:30 am - 5:25 pmSOF Sofia-DEN Denver Intl

16h 55m1 stop Istanbul

$697Turkish Airlines

Mon, Feb 8 - Wed, Feb 17

4:15 pm - 10:55 pmDEN Denver Intl-SOF Sofia

21h 40m1 stop Munich Franz Josef Strauss

6:25 am - 7:20 pmSOF Sofia-DEN Denver Intl

21h 55m2 stops Frankfurt am Main Vancouver Intl

$697Multiple Airlines

Mon, Feb 8 - Wed, Feb 17

7:30 pm - 3:10 pmDEN Denver Intl-SOF Sofia

34h 40m1 stop Istanbul

9:30 am - 5:25 pmSOF Sofia-DEN Denver Intl

16h 55m1 stop Istanbul

$698Turkish Airlines

Mon, Feb 8 - Wed, Feb 17

7:30 pm - 8:55 pmDEN Denver Intl-SOF Sofia

16h 25m1 stop Istanbul

9:45 pm - 5:25 pmSOF Sofia-DEN Denver Intl

28h 40m1 stop Istanbul

$698Turkish Airlines

Mon, Nov 16 - Tue, Nov 24

11:25 am - 1:15 pmDEN Denver Intl-SOF Sofia

16h 50m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss

6:25 am - 6:06 pmSOF Sofia-DEN Denver Intl

20h 41m2 stops Frankfurt am Main Toronto Pearson Intl

$707Multiple Airlines

Mon, Feb 8 - Wed, Feb 17

3:55 pm - 11:00 pmDEN Denver Intl-SOF Sofia

22h 05m1 stop Frankfurt am Main

6:25 am - 1:40 pmSOF Sofia-DEN Denver Intl

16h 15m1 stop Frankfurt am Main

$729United Airlines

Tue, Mar 2 - Fri, Mar 5

3:55 pm - 11:00 pmDEN Denver Intl-SOF Sofia

22h 05m1 stop Frankfurt am Main

6:25 am - 3:35 pmSOF Sofia-DEN Denver Intl

18h 10m1 stop Frankfurt am Main

$730United Airlines

Tue, Mar 2 - Fri, Mar 5

8:15 am - 1:25 pmDEN Denver Intl-SOF Sofia

20h 10m2 stops Vancouver Intl Frankfurt am Main

6:25 am - 8:26 pmSOF Sofia-DEN Denver Intl

23h 01m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$733Air Canada

Tue, Mar 2 - Fri, Mar 5

4:55 pm - 1:25 pmDEN Denver Intl-SOF Sofia

35h 30m2 stops Chicago O'Hare Intl Frankfurt am Main

6:25 am - 3:35 pmSOF Sofia-DEN Denver Intl

18h 10m1 stop Frankfurt am Main

$739Lufthansa

Sat, Feb 27 - Tue, Mar 9

4:15 pm - 10:55 pmDEN Denver Intl-SOF Sofia

21h 40m1 stop Munich Franz Josef Strauss

6:25 am - 3:35 pmSOF Sofia-DEN Denver Intl

18h 10m1 stop Frankfurt am Main

$763Lufthansa

Sat, Feb 27 - Tue, Mar 9

Cheap last minute flights

Enter your travel dates to find the best prices.

8:30 pm - 8:40 amDEN Denver Intl-SOF Sofia

28h 10m1 stop Istanbul

9:30 am - 5:25 pmSOF Sofia-DEN Denver Intl

16h 55m1 stop Istanbul

$778Turkish Airlines

Wed, Oct 28 - Sun, Nov 15

8:30 pm - 3:10 pmDEN Denver Intl-SOF Sofia

34h 40m1 stop Istanbul

4:00 pm - 5:25 pmSOF Sofia-DEN Denver Intl

34h 25m1 stop Istanbul

$826Turkish Airlines

Sun, Oct 25 - Sat, Nov 14

8:30 pm - 3:10 pmDEN Denver Intl-SOF Sofia

34h 40m1 stop Istanbul

9:30 am - 5:25 pmSOF Sofia-DEN Denver Intl

16h 55m1 stop Istanbul

$826Turkish Airlines

Mon, Oct 26 - Mon, Dec 21

5:15 pm - 6:20 pmDEN Denver Intl-SOF Sofia

17h 05m1 stop Munich Franz Josef Strauss

6:00 am - 2:30 pmSOF Sofia-DEN Denver Intl

17h 30m1 stop Munich Franz Josef Strauss

$891Lufthansa

Tue, Oct 27 - Sun, Nov 15

5:58 pm - 6:20 pmDEN Denver Intl-SOF Sofia

16h 22m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

7:05 pm - 2:30 pmSOF Sofia-DEN Denver Intl

28h 25m1 stop Munich Franz Josef Strauss

$894Lufthansa

Mon, Oct 26 - Mon, Dec 21

4:48 pm - 10:55 pmDEN Denver Intl-SOF Sofia

22h 07m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

2:00 pm - 2:25 pmSOF Sofia-DEN Denver Intl

33h 25m2 stops Munich Franz Josef Strauss London Heathrow

$928United Airlines

Mon, Oct 26 - Mon, Dec 21

5:58 pm - 6:20 pmDEN Denver Intl-SOF Sofia

16h 22m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

2:10 pm - 11:53 pmSOF Sofia-DEN Denver Intl

18h 43m2 stops Frankfurt am Main Chicago O'Hare Intl

$935Lufthansa

Mon, Oct 26 - Mon, Dec 21

7:50 am - 10:55 pmDEN Denver Intl-SOF Sofia

31h 05m2 stops Boston Logan Intl Munich Franz Josef Strauss

2:10 pm - 9:55 amSOF Sofia-DEN Denver Intl

28h 45m2 stops Frankfurt am Main San Francisco

$951United Airlines

Sun, Oct 25 - Sat, Nov 21

1:10 pm - 11:10 pmDEN Denver Intl-SOF Sofia

26h 00m3 stops Los Angeles Lisbon Humberto Delgado Rome Fiumicino

6:00 am - 8:29 amSOF Sofia-DEN Denver Intl

35h 29m3 stops Bologna Guglielmo Marconi Casablanca Mohamed V Miami

$1,162Multiple Airlines

Tue, Oct 27 - Sun, Nov 15

1:30 pm - 11:35 pmDEN Denver Intl-SOF Sofia

26h 05m3 stops Toronto Pearson Intl Zurich Václav Havel Prague

6:00 am - 8:29 amSOF Sofia-DEN Denver Intl

35h 29m3 stops Bologna Guglielmo Marconi Casablanca Mohamed V Miami

$1,193Multiple Airlines

Wed, Oct 28 - Sun, Nov 15

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United Airlines flights from Denver to Sofia

Our best United Airlines deals on Denver to Sofia flight tickets

United Airlines

Mar 2

DEN3:55 pmDenver Intl

22h 05m

1 stop

SOF11:00 pmSofia

Mar 5

SOF6:25 amSofia

16h 15m

1 stop

DEN1:40 pmDenver Intl

$729

United Airlines

Mar 2

DEN3:55 pmDenver Intl

22h 05m

1 stop

SOF11:00 pmSofia

Mar 5

SOF6:25 amSofia

18h 10m

1 stop

DEN3:35 pmDenver Intl

$730

United Airlines

Mar 2

DEN8:10 amDenver Intl

20h 15m

2 stops

SOF1:25 pmSofia

Mar 5

SOF6:25 amSofia

16h 15m

1 stop

DEN1:40 pmDenver Intl

$734

Air Canada flights from Denver to Sofia

Our best Air Canada deals on Denver to Sofia flight tickets

Air Canada

Mar 2

DEN8:15 amDenver Intl

20h 10m

2 stops

SOF1:25 pmSofia

Mar 5

SOF6:25 amSofia

23h 01m

2 stops

DEN8:26 pmDenver Intl

$733

Air Canada

Feb 27

DEN1:30 pmDenver Intl

38h 55m

2 stops

SOF1:25 pmSofia

Mar 9

SOF6:25 amSofia

20h 21m

2 stops

DEN5:46 pmDenver Intl

$745

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Mon 2/8

7:30 pm-3:10 pm

1 stop34h 40m

Sofia

Wed 2/17

9:30 am-5:25 pm

1 stop16h 55m

$697

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Mon 2/8

4:15 pm-10:55 pm

1 stop21h 40m

Sofia

Wed 2/17

6:25 am-7:20 pm

2 stops21h 55m

$697

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Mon 2/8

7:30 pm-3:10 pm

1 stop34h 40m

Sofia

Wed 2/17

9:30 am-5:25 pm

1 stop16h 55m

$698

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Mon 11/16

7:30 pm-8:55 pm

1 stop16h 25m

Sofia

Tue 11/24

9:45 pm-5:25 pm

1 stop28h 40m

$698

Quickest round-trip

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Mon 2/8

11:25 am-1:15 pm

2 stops16h 50m

Sofia

Wed 2/17

6:25 am-6:06 pm

2 stops20h 41m

$707

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Tue 3/2

3:55 pm-11:00 pm

1 stop22h 05m

Sofia

Fri 3/5

6:25 am-1:40 pm

1 stop16h 15m

$729

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Tue 3/2

3:55 pm-11:00 pm

1 stop22h 05m

Sofia

Fri 3/5

6:25 am-3:35 pm

1 stop18h 10m

$730

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Tue 3/2

8:15 am-1:25 pm

2 stops20h 10m

Sofia

Fri 3/5

6:25 am-8:26 pm

2 stops23h 01m

$733

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Sat 2/27

4:55 pm-1:25 pm

2 stops35h 30m

Sofia

Tue 3/9

6:25 am-3:35 pm

1 stop18h 10m

$739

DenverSofia

DEN Denver Intl - SOF Sofia

DENSOF

Denver Intl

Sat 2/27

4:15 pm-10:55 pm

1 stop21h 40m

Sofia

Tue 3/9

6:25 am-3:35 pm

1 stop18h 10m

$763

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 typical price of a round-trip flight between Denver and Sofia?

Prices are currently typical for flights on this route.

Typical prices usually range from $664 to $756.
The lowest price recently found on this route was $697.

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Denver is in March. Flight prices, which tend to average around $623, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of March, then book flights to Sofia from Denver during April instead. Flights to Sofia in April, while not as cheap as those in March, still average around $634.

How far in advance should I book a flight from Denver 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 $824 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 $706 on momondo.

Can stopping save me money on Denver to Sofia flights?

You could potentially save up to 50% on your flight if you consider stops on a Denver to Sofia flight.

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

Best Price Found	$329
Fastest flight time	20h 25m
Direct flights	None

The best one-way flight to Sofia from Denver in the past 72 hours is $329. The best round-trip flight deal from Denver to Sofia found on momondo in the last 72 hours is $697.

The fastest flight from Denver to Sofia takes 20h 25m

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

Search flight deals

Frequently asked questions about flying from Denver to Sofia

How far is Denver Intl to Sofia by plane?
There are 5884.6 mi between Denver Intl and Sofia. Typically, this will take 20h 25m 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 2026, 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 36% of all bookings. The subsequent popular airlines are United Airlines at 32% and Lufthansa at 32%.

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 $571	Free Cancellation	Rating 7.4 4,460 reviews	Search Turkish Airlines flights
Lufthansa	PriceFrom $661	Free Cancellation	Rating 6.8 8,292 reviews	Search Lufthansa flights
United Airlines	PriceFrom $768	Free Cancellation	Rating 7.3 10,417 reviews	Search United Airlines 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.

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Cheap flights from Denver to Sofia from $329

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 3/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from Denver to Sofia

Our best United Airlines deals on Denver to Sofia flight tickets

Air Canada flights from Denver to Sofia

Our best Air Canada deals on Denver to Sofia flight tickets

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How to get the cheapest flight ticket from Denver to Sofia

What is the typical price of a round-trip flight between Denver and Sofia?

What is the cheapest month to fly to Sofia?

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

Can stopping save me money on Denver to Sofia flights?

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

What airlines fly to Sofia?

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

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

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

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

When to book flights from Denver to Sofia

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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.

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List of cabin classes available on flights landing in Sofia. Availability may vary depending on flight origin and airline.

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