DEN - SOF

$590 Find Cheap Flights from Denver to Sofia - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$590
Typical prices: $656-$1,029
British Airways
Thu 10/18Fri 11/2
DEN - SOF • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Denver and Sofia. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to book
13 weeks
in advance
Our data shows that travelers who book at least 13 weeks in advance save around 26% compared to booking last minute.
Insights
Insights
When to travel
November
Cheapest • 28% price drop
June
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Istanbul (IST)
Cheapest • Avg $742 (round-trip)
Frankfurt am Main (FRA)
Shortest trip • 15h 46m (one-way)
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Insights
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Flight Deals

Cheap Flights from Denver to Sofia (DEN-SOF)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Denver to Sofia

Sun, Oct 18 - Mon, Nov 2
British Airways Logo
6:35 pm - 7:20 pmDEN  Denver Intl-SOF Sofia
15h 45m1 stop London Heathrow
British Airways Logo
5:15 pm - 3:10 pmSOF  Sofia-DEN Denver Intl
30h 55m1 stop London Heathrow
$590British Airways
Mon, Jan 4 - Wed, Jan 27
Multiple Airlines Logo
4:15 pm - 10:55 pmDEN  Denver Intl-SOF Sofia
21h 40m1 stop Munich Franz Josef Strauss
Multiple Airlines Logo
6:25 am - 6:13 pmSOF  Sofia-DEN Denver Intl
20h 48m2 stops Frankfurt am Main Vancouver Intl
$618Multiple Airlines
Mon, Jan 11 - Mon, Feb 8
Lufthansa Logo
4:15 pm - 10:55 pmDEN  Denver Intl-SOF Sofia
21h 40m1 stop Munich Franz Josef Strauss
Lufthansa Logo
7:05 pm - 2:30 pmSOF  Sofia-DEN Denver Intl
28h 25m1 stop Munich Franz Josef Strauss
$623Lufthansa
Mon, Jan 4 - Wed, Jan 27
Lufthansa Logo
4:15 pm - 10:55 pmDEN  Denver Intl-SOF Sofia
21h 40m1 stop Munich Franz Josef Strauss
Lufthansa Logo
2:00 pm - 2:30 pmSOF  Sofia-DEN Denver Intl
33h 30m1 stop Munich Franz Josef Strauss
$623Lufthansa
Mon, Jan 11 - Mon, Feb 8
Multiple Airlines Logo
11:25 am - 1:15 pmDEN  Denver Intl-SOF Sofia
16h 50m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss
Multiple Airlines Logo
7:05 pm - 2:30 pmSOF  Sofia-DEN Denver Intl
28h 25m1 stop Munich Franz Josef Strauss
$624Multiple Airlines
Mon, Jan 4 - Wed, Jan 27
United Airlines Logo
6:00 am - 11:50 amDEN  Denver Intl-SOF Sofia
20h 50m2 stops Washington, D.C. Dulles Intl Vienna Intl
United Airlines Logo
7:55 am - 7:31 pmSOF  Sofia-DEN Denver Intl
20h 36m2 stops Vienna Intl Newark
$640United Airlines
Mon, Feb 1 - Fri, Feb 5
United Airlines Logo
4:15 pm - 10:55 pmDEN  Denver Intl-SOF Sofia
21h 40m1 stop Munich Franz Josef Strauss
United Airlines Logo
6:25 am - 1:40 pmSOF  Sofia-DEN Denver Intl
16h 15m1 stop Frankfurt am Main
$719United Airlines
Sun, Oct 11 - Mon, Nov 23
Turkish Airlines Logo
8:30 pm - 3:00 pmDEN  Denver Intl-SOF Sofia
33h 30m1 stop Istanbul
Turkish Airlines Logo
9:30 am - 5:25 pmSOF  Sofia-DEN Denver Intl
16h 55m1 stop Istanbul
$775Turkish Airlines
Fri, Mar 19 - Sat, Mar 27
Turkish Airlines Logo
8:30 pm - 3:10 pmDEN  Denver Intl-SOF Sofia
34h 40m1 stop Istanbul
Turkish Airlines Logo
4:00 pm - 6:25 pmSOF  Sofia-DEN Denver Intl
34h 25m1 stop Istanbul
$776Turkish Airlines
Thu, Nov 5 - Mon, Nov 9
Lufthansa Logo
4:15 pm - 10:55 pmDEN  Denver Intl-SOF Sofia
21h 40m1 stop Munich Franz Josef Strauss
Lufthansa Logo
7:05 pm - 2:30 pmSOF  Sofia-DEN Denver Intl
28h 25m1 stop Munich Franz Josef Strauss
$834Lufthansa
Booking Insights

Price, demand and travel trends for Denver to Sofia flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Denver to Sofia?

Round-trip flights from Denver to Sofia typically range from $656 to $1,029. The lowest price found in the past 5 days was $590, on British Airways.

What's the cheapest day of the week to fly from Denver to Sofia?

Based on deals KAYAK users found in the last 12 months, Saturday is the cheapest day of the week to fly from Denver to Sofia. It’s 18% cheaper than the average day, while Monday is the most expensive, with prices 18% higher.

What’s the cheapest month to fly from Denver to Sofia?

•November is the cheapest month to fly from Denver to Sofia at $617 round-trip.
•June ($1,044) and December ($1,026) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 69% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from Denver to Sofia the cheapest?

Flights from Denver to Sofia are cheapest 13 weeks before departure. Booking in this window typically costs about 26% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

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Key details for Denver to Sofia flights

Low season

February

Cheapest flight

$590
Beat the crowds with an average 30% drop in travelers.
The most popular month to fly with an average 201% increase in travelers.
Round-trip flight from Denver to Sofia

When to book flights from Denver to Sofia

Are your dates flexible? Find out the best times to travel from Denver to Sofia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Denver to Sofia flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Denver to Sofia?

    Three cabin classes are available on flights from Denver to Sofia:

    • Economy Class
    • Premium Economy Class
    • Business Class

  • How long is a flight from Denver to Sofia?

    A nonstop flight from Denver to Sofia takes 00m, covering 5,871 miles.

  • Do I need a passport to fly from Denver to Sofia?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How much should I expect to pay for a Denver to Sofia flight?

    Round-trip flights from Denver to Sofia range from $656 to $1,029, with an average of $860 over the past 12 months. Anything below $656 counts as a good deal.

  • How expensive are last-minute Denver to Sofia flights?

    Last-minute fares on this route (booked within two weeks of departure) are 6% below the route average of $860. Booking late can sometimes save you money, but inventory is limited.

  • Have flight prices from Denver to Sofia changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $590 to $1,469. That means the highest observed fare was about 2x higher than the lowest one.

  • What car rental options are available at Sofia Airport (SOF)?

    Sofia Airport (SOF) hosts 5 major car rental companies, with daily rates starting from around $1 for economy cars. Top options include:

    • MEXRENTACAR
    • Easyrent
    • Top Rent a Car - Bulgaria
    • NU Car
    • Priceless

  • Which airports can I use when flying from Denver to Sofia?

    Flights from Denver to Sofia usually depart from Denver Intl (DEN) and arrive at Sofia (SOF).

  • Which airports do connecting flights from Denver to Sofia pass through?

    One-stop flights from Denver to Sofia most commonly connect through:

    • Istanbul (IST) - 59% of one-stop connections
    • Munich Franz Josef Strauss (MUC) - 33% of one-stop connections
    • Frankfurt am Main (FRA) - 4% of one-stop connections
    • London Heathrow (LHR) - 4% of one-stop connections

  • Can I save money by using flexible dates for flights from Denver to Sofia?

    Yes. Flexible dates can save you up to 31% on flights from Denver to Sofia. Saturday is the cheapest departure day at $713 round-trip on average, while Monday is the most expensive at $1,023, a difference of $310.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • How much time can I save by choosing a different layover airport from Denver to Sofia?

    Flying via Frankfurt am Main (FRA) gives the shortest average 1-stop total travel time at 15h 46m, compared with 16h 35m via Munich Franz Josef Strauss (MUC) and 17h 43m via Istanbul (IST).

  • What is the time difference between Denver and Sofia?

    Sofia is 9 hours ahead of Denver (Eastern European Time vs Mountain Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Sofia?

    Some of the most popular sights in Sofia are Vasil Levski National Stadium, National Palace of Culture and Central Sofia Market Hall. These are among the most viewed places in Sofia on KAYAK.

Your guide to booking Denver to Sofia flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Saturday departure and avoid flying on Monday. On this route, Saturday flights average $713, about $310 less than Monday fares (30% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 13 weeks before you fly. On this route, that window historically saves about 26% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Denver to Sofia trip for November. Fares historically average $617 round-trip in that month - typically $427 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Sofia Airport.

    • Hotel Premier Airport Sofia
    • ibis Sofia Airport
    • Hotel Consul

More options for your flight from Denver to Sofia

Complete your trip to Sofia with a hotel stay or car rental

Car rentals in Sofia
Hotels in Sofia
Vacations in Sofia