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Cheap flights from Denver to Sofia from $399

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 6/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Denver to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Turkish Airlines Logo
8:25 pm - 3:00 pm
DEN
-
SOF
33h 35m
1 stop
Turkish Airlines Logo
9:05 pm - 6:25 pm
SOF
-
DEN
30h 20m
1 stop
$714Turkish Airlines
Thu, Sep 3 - Mon, Sep 7
Multiple Airlines Logo
5:40 pm - 10:50 pm
DEN
-
SOF
20h 10m
1 stop
Multiple Airlines Logo
6:10 am - 11:08 pm
SOF
-
DEN
25h 58m
2 stops
$794Multiple Airlines
Tue, Sep 29 - Tue, Oct 20
Multiple Airlines Logo
9:40 am - 1:05 pm
DEN
-
SOF
18h 25m
2 stops
Multiple Airlines Logo
12:55 pm - 11:08 pm
SOF
-
DEN
19h 13m
2 stops
$801Multiple Airlines
Tue, Sep 29 - Tue, Oct 20
Turkish Airlines Logo
8:25 pm - 8:15 pm
DEN
-
SOF
14h 50m
1 stop
Turkish Airlines Logo
9:05 pm - 9:39 pm
SOF
-
DEN
33h 34m
2 stops
$804Turkish Airlines
Thu, Sep 3 - Mon, Sep 7
Multiple Airlines Logo
11:40 am - 2:00 pm
DEN
-
SOF
17h 20m
2 stops
Multiple Airlines Logo
7:00 am - 8:19 pm
SOF
-
DEN
22h 19m
2 stops
$830Multiple Airlines
Fri, Sep 4 - Fri, Sep 11
United Airlines Logo
11:45 am - 6:40 pm
DEN
-
SOF
21h 55m
2 stops
United Airlines Logo
12:55 pm - 2:20 pm
SOF
-
DEN
34h 25m
1 stop
$835United Airlines
Thu, Oct 8 - Mon, Oct 12
Lufthansa Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
Lufthansa Logo
7:25 pm - 1:45 pm
SOF
-
DEN
27h 20m
1 stop
$848Lufthansa
Fri, Aug 14 - Sat, Aug 22
United Airlines Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
United Airlines Logo
6:10 am - 1:45 pm
SOF
-
DEN
16h 35m
1 stop
$850United Airlines
Fri, Sep 4 - Fri, Sep 11
Air Canada Logo
6:10 pm - 12:10 pm
DEN
-
SOF
33h 00m
2 stops
Air Canada Logo
2:20 pm - 10:31 am
SOF
-
DEN
53h 11m
2 stops
$851Air Canada
Thu, Oct 8 - Mon, Oct 12
United Airlines Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
United Airlines Logo
6:20 am - 10:31 am
SOF
-
DEN
37h 11m
2 stops
$853United Airlines
Fri, Sep 4 - Fri, Sep 11

United Airlines flights from Denver to Sofia

Our best United Airlines deals on Denver to Sofia flight tickets
United Airlines
Oct 8
DEN11:45 amDenver Intl
21h 55m
2 stops
SOF6:40 pmSofia
Oct 12
SOF12:55 pmSofia
34h 25m
1 stop
DEN2:20 pmDenver Intl
$835
United Airlines
Sep 4
DEN4:15 pmDenver Intl
22h 00m
1 stop
SOF11:15 pmSofia
Sep 11
SOF6:10 amSofia
16h 35m
1 stop
DEN1:45 pmDenver Intl
$850
United Airlines
Sep 4
DEN4:15 pmDenver Intl
22h 00m
1 stop
SOF11:15 pmSofia
Sep 11
SOF6:20 amSofia
37h 11m
2 stops
DEN10:31 amDenver Intl
$853

Lufthansa flights from Denver to Sofia

Our best Lufthansa deals on Denver to Sofia flight tickets
Lufthansa
Aug 14
DEN4:15 pmDenver Intl
22h 00m
1 stop
SOF11:15 pmSofia
Aug 22
SOF7:25 pmSofia
27h 20m
1 stop
DEN1:45 pmDenver Intl
$848
Lufthansa
Sep 25
DEN4:15 pmDenver Intl
17h 25m
1 stop
SOF6:40 pmSofia
Oct 2
SOF6:20 amSofia
18h 20m
1 stop
DEN3:40 pmDenver Intl
$857
Lufthansa
May 13
DEN4:05 pmDenver Intl
17h 35m
1 stop
SOF6:40 pmSofia
May 26
SOF6:10 amSofia
17h 10m
1 stop
DEN2:20 pmDenver Intl
$935

momondo Fare Finder

 
Customize your flight search to find flights from Denver to Sofia 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, momondo users made 832,500 searches. Data last updated April 24, 2026.
Use the filters below to find and compare flights from Denver to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 9/3

8:25 pm-3:00 pm

1 stop33h 35m

Sofia

Mon 9/7

9:05 pm-6:25 pm

1 stop30h 20m

$714

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 9/29

5:40 pm-10:50 pm

1 stop20h 10m

Sofia

Tue 10/20

6:10 am-11:08 pm

2 stops25h 58m

$794
Quickest round-trip

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Tue 9/29

9:40 am-1:05 pm

2 stops18h 25m

Sofia

Tue 10/20

12:55 pm-11:08 pm

2 stops19h 13m

$801

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 9/3

8:25 pm-8:15 pm

1 stop14h 50m

Sofia

Mon 9/7

9:05 pm-9:39 pm

2 stops33h 34m

$804

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/4

11:40 am-2:00 pm

2 stops17h 20m

Sofia

Fri 9/11

7:00 am-8:19 pm

2 stops22h 19m

$830

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 10/8

11:45 am-6:40 pm

2 stops21h 55m

Sofia

Mon 10/12

12:55 pm-2:20 pm

1 stop34h 25m

$835

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 8/14

4:15 pm-11:15 pm

1 stop22h 00m

Sofia

Sat 8/22

7:25 pm-1:45 pm

1 stop27h 20m

$848

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/4

4:15 pm-11:15 pm

1 stop22h 00m

Sofia

Fri 9/11

6:10 am-1:45 pm

1 stop16h 35m

$850

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Thu 10/8

6:10 pm-12:10 pm

2 stops33h 00m

Sofia

Mon 10/12

2:20 pm-10:31 am

2 stops53h 11m

$851

DenverSofia

DEN - SOF

DENSOF

Denver Intl

Fri 9/4

4:15 pm-11:15 pm

1 stop22h 00m

Sofia

Fri 9/11

6:20 am-10:31 am

2 stops37h 11m

$853

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Denver and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Denver is in November. Flight prices, which tend to average around $596, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Sofia from Denver during April instead. Flights to Sofia in April, while not as cheap as those in November, still average around $619.

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 $770 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 $642 on momondo.

Can stopping save me money on Denver to Sofia flights?

You could potentially save up to 43% 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

Fastest flight time

15h 40m

Direct flights

None
The fastest flight from Denver to Sofia takes 15h 40m
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 15h 40m 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?

  • 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?

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 AirlinesPriceFrom $568Free CancellationRating
7.4
4,325 reviews
Search Turkish Airlines flights
LufthansaPriceFrom $577Free CancellationRating
6.8
7,946 reviews
Search Lufthansa flights
United AirlinesPriceFrom $656Free CancellationRating
7.4
9,643 reviews
Search United Airlines flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
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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Fly your favorite airline to Sofia

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