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

British Airways is the most popular carrier operating from Denver Intl to Sofia

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

Istanbul (IST) has the shortest average layover time for this route: 4h 24m.

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 offers the lowest fares from Denver to Sofia?

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $903.

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

Istanbul (IST) was the most common stop: 79% of momondo users choosing 1-stop flights on this route connected there.

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 54% 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.

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 September 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.

$288 Cheap Flights from Denver to Sofia in 2025/26

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Find the cheapest flights from Denver to Sofia

Round-trip

One-way

Cheap round-trip flights

8:20 pm - 9:15 amDEN-SOF

28h 55m1 stop

10:05 am - 5:35 pmSOF-DEN

16h 30m1 stop

$552Turkish Airlines

Find Deal

Tue, Oct 28 - Sat, Nov 8

6:25 pm - 4:20 pmDEN-SOF

13h 55m1 stop

5:25 pm - 3:30 pmSOF-DEN

31h 05m1 stop

$558British Airways

Find Deal

Sun, Oct 26 - Mon, Nov 10

5:25 pm - 6:20 pmDEN-SOF

16h 55m2 stops

6:00 am - 4:00 pmSOF-DEN

19h 00m1 stop

$583Lufthansa

Find Deal

Wed, Oct 29 - Tue, Nov 11

11:59 pm - 8:10 pmDEN-SOF

35h 11m2 stops

9:00 pm - 8:26 pmSOF-DEN

32h 26m2 stops

$587American Airlines

Find Deal

Mon, Nov 3 - Wed, Nov 12

5:20 pm - 6:20 pmDEN-SOF

17h 00m1 stop

6:00 am - 4:00 pmSOF-DEN

19h 00m1 stop

$600Lufthansa

Find Deal

Wed, Oct 29 - Tue, Nov 11

6:25 pm - 8:10 pmDEN-SOF

17h 45m1 stop

12:05 pm - 3:30 pmSOF-DEN

36h 25m1 stop

$617American Airlines

Find Deal

Tue, Oct 28 - Sat, Nov 8

9:20 pm - 6:20 pmDEN-SOF

13h 00m1 stop

6:10 am - 4:00 pmSOF-DEN

18h 50m1 stop

$621United Airlines

Find Deal

Mon, Oct 27 - Wed, Nov 5

3:20 pm - 6:20 pmDEN-SOF

18h 00m2 stops

6:00 am - 1:40 pmSOF-DEN

16h 40m1 stop

$622United Airlines

Find Deal

Tue, Nov 18 - Thu, Nov 27

11:44 am - 6:00 pmDEN-SOF

22h 16m2 stops

6:00 am - 7:55 pmSOF-DEN

22h 55m2 stops

$626Air Canada

Find Deal

Wed, Oct 29 - Thu, Nov 6

4:19 pm - 7:20 pmDEN-SOF

42h 01m2 stops

6:10 am - 6:05 pmSOF-DEN

44h 55m2 stops

$629Air Canada

Find Deal

Sat, Oct 25 - Fri, Nov 7

British Airways flights from Denver to Sofia

Our best British Airways deals on Denver to Sofia flight tickets

British Airways

Oct 26

DEN6:25 pmDenver Intl

13h 55m

1 stop

SOF4:20 pmSofia

Nov 10

SOF5:25 pmSofia

31h 05m

1 stop

DEN3:30 pmDenver Intl

$558

Find similar

British Airways

Oct 26

DEN6:25 pmDenver Intl

13h 55m

1 stop

SOF4:20 pmSofia

Nov 10

SOF5:25 pmSofia

31h 05m

1 stop

DEN3:30 pmDenver Intl

$568

Find similar

British Airways

Oct 22

DEN6:35 pmDenver Intl

33h 55m

1 stop

SOF1:30 pmSofia

Nov 5

SOF9:00 pmSofia

27h 30m

1 stop

DEN3:30 pmDenver Intl

$569

Find similar

Air Canada flights from Denver to Sofia

Our best Air Canada deals on Denver to Sofia flight tickets

Air Canada

Oct 29

DEN11:44 amDenver Intl

22h 16m

2 stops

SOF6:00 pmSofia

Nov 6

SOF6:00 amSofia

22h 55m

2 stops

DEN7:55 pmDenver Intl

$626

Find similar

Air Canada

Oct 25

DEN4:19 pmDenver Intl

42h 01m

2 stops

SOF7:20 pmSofia

Nov 7

SOF6:10 amSofia

44h 55m

2 stops

DEN6:05 pmDenver Intl

$629

Find similar

Air Canada

Oct 25

DEN5:36 pmDenver Intl

40h 44m

2 stops

SOF7:20 pmSofia

Nov 5

SOF6:10 amSofia

44h 55m

2 stops

DEN6:05 pmDenver Intl

$634

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 10/28

8:20 pm-9:15 am

1 stop28h 55m

Sofia

Sat 11/8

10:05 am-5:35 pm

1 stop16h 30m

$552

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sun 10/26

6:25 pm-4:20 pm

1 stop13h 55m

Sofia

Mon 11/10

5:25 pm-3:30 pm

1 stop31h 05m

$558

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 10/29

5:25 pm-6:20 pm

2 stops16h 55m

Sofia

Tue 11/11

6:00 am-4:00 pm

1 stop19h 00m

$583

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 11/3

11:59 pm-8:10 pm

2 stops35h 11m

Sofia

Wed 11/12

9:00 pm-8:26 pm

2 stops32h 26m

$587

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 10/29

5:20 pm-6:20 pm

1 stop17h 00m

Sofia

Tue 11/11

6:00 am-4:00 pm

1 stop19h 00m

$600

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 10/28

6:25 pm-8:10 pm

1 stop17h 45m

Sofia

Sat 11/8

12:05 pm-3:30 pm

1 stop36h 25m

$617

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Mon 10/27

9:20 pm-6:20 pm

1 stop13h 00m

Sofia

Wed 11/5

6:10 am-4:00 pm

1 stop18h 50m

$621

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 11/18

3:20 pm-6:20 pm

2 stops18h 00m

Sofia

Thu 11/27

6:00 am-1:40 pm

1 stop16h 40m

$622

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Wed 10/29

11:44 am-6:00 pm

2 stops22h 16m

Sofia

Thu 11/6

6:00 am-7:55 pm

2 stops22h 55m

$626

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Sat 10/25

4:19 pm-7:20 pm

2 stops42h 01m

Sofia

Fri 11/7

6:10 am-6:05 pm

2 stops44h 55m

$629

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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 $896 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.

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How far is Denver Intl to Sofia by plane?
There are 5884.6 mi between Denver Intl and Sofia. Typically, this will take 13h 00m 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 September 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 54% of all bookings. The subsequent popular airlines are United Airlines at 23% and Lufthansa at 23%.

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 3,965 reviews	Search Turkish Airlines flights
Lufthansa	PriceFrom $672	Free Cancellation	Rating 6.8 7,409 reviews	Search Lufthansa flights
United Airlines	PriceFrom $674	Free Cancellation	Rating 7.4 8,926 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.

An easier way to manage your Sofia trip

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Cheap flights from Denver to Sofia from $288

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 10/8. 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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Find the cheapest flights from Denver to Sofia

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British Airways flights from Denver to Sofia

Our best British Airways 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

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?

British Airways 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: 79% 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 $903.

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?

Istanbul (IST) has the shortest average layover time for this route: 4h 24m.

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