DEN - SOF

$793 Find Cheap Flights from Denver to Sofia - Compare and Save

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Sofia departing on 8/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Sofia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Sofia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Sofia, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$793
Typical prices: $549-$1,144
Lufthansa
Sun 8/2Tue 8/18
DEN - SOF • 1 stop
Top airlines
Cheapest • from $793 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Denver and Sofia. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $760 (round-trip)
Shortest trip • 14h 44m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 28% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sofia!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Denver to Sofia (DEN-SOF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to Sofia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Denver to Sofia

Sun, Aug 2 - Tue, Aug 18
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
$793Lufthansa
Sun, Aug 2 - Tue, Aug 18
Lufthansa Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
Lufthansa Logo
12:55 pm - 1:45 pm
SOF
-
DEN
33h 50m
1 stop
$794Lufthansa
Sun, Aug 2 - Tue, Aug 18
Multiple Airlines Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
Multiple Airlines Logo
7:25 pm - 1:45 pm
SOF
-
DEN
27h 20m
1 stop
$808Multiple Airlines
Sun, Aug 2 - Tue, Aug 18
Multiple Airlines Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
Multiple Airlines Logo
7:25 pm - 1:45 pm
SOF
-
DEN
27h 20m
1 stop
$809Multiple Airlines
Sun, Aug 2 - Tue, Aug 18
United Airlines Logo
6:13 am - 12:10 pm
DEN
-
SOF
20h 57m
2 stops
United Airlines Logo
12:55 pm - 1:45 pm
SOF
-
DEN
33h 50m
1 stop
$813United Airlines
Sun, Aug 2 - Tue, Aug 18
United Airlines Logo
4:15 pm - 11:15 pm
DEN
-
SOF
22h 00m
1 stop
United Airlines Logo
2:10 pm - 7:45 pm
SOF
-
DEN
38h 35m
2 stops
$827United Airlines
Sun, Aug 2 - Tue, Aug 18
United Airlines Logo
8:00 am - 11:15 pm
DEN
-
SOF
30h 15m
2 stops
United Airlines Logo
2:10 pm - 7:45 pm
SOF
-
DEN
38h 35m
2 stops
$831United Airlines
Sun, Aug 2 - Tue, Aug 18
Multiple Airlines Logo
6:13 am - 12:10 pm
DEN
-
SOF
20h 57m
2 stops
Multiple Airlines Logo
6:40 pm - 1:45 pm
SOF
-
DEN
28h 05m
2 stops
$845Multiple Airlines
Fri, Aug 14 - Thu, Aug 20
United Airlines Logo
7:40 am - 11:15 pm
DEN
-
SOF
30h 35m
2 stops
United Airlines Logo
6:10 am - 1:45 pm
SOF
-
DEN
16h 35m
1 stop
$852United Airlines
Fri, Aug 14 - Thu, Aug 20
United Airlines Logo
3:40 pm - 11:15 pm
DEN
-
SOF
22h 35m
2 stops
United Airlines Logo
6:10 am - 6:15 pm
SOF
-
DEN
21h 05m
2 stops
$862United Airlines
Booking Insights

KAYAK's insights & trends for Denver to Sofia flights

Get data-powered insights and trends into flights from Denver to Sofia to help you find the cheapest flights, the best time to fly and much more.

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

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Denver to Sofia departing in August.

What is the cheapest month to fly from Denver to Sofia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Sofia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Denver to Sofia is November, where tickets cost $600 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,026 and $982 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Sofia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Denver to Sofia, you should book around 2 weeks before departure, which saves you about 28% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$793
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly with an average 26% increase in price.
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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to Sofia

  • What is the cheapest flight from Denver to Sofia?

    In the last 5 days, the lowest price for a flight from Denver to Sofia was $793 for a round-trip ticket.

  • Do I need a passport to fly between Denver and Sofia?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Denver and on arrival in Sofia.

  • Which aircraft models fly most regularly from Denver to Sofia?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Denver to Sofia?

    Star Alliance is the only airline alliance operating flights between Denver and Sofia.

  • Which is the best airline for flights from Denver to Sofia, Turkish Airlines or United Airlines?

    The two airlines most popular with KAYAK users for flights from Denver to Sofia are Turkish Airlines and United Airlines. With an average price for the route of $632 and an overall rating of 7.4, Turkish Airlines is the most popular choice. United Airlines is also a great choice for the route, with an average price of $996 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Denver to Sofia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to Sofia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to Sofia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to Sofia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Denver with another airline. Booking your flights between Denver and SOF can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to Sofia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Denver to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Denver to Sofia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Sofia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
Turkish AirlinesOverall score based on 4421 reviews
7.3Boarding
7.3Comfort
7.5Entertainment
7.5Food
7.8Crew
Airline reviews

We fly Bussines class and we didn’t feel like it is. Out luggage didn’t arrive and we have to return again next day from our hotel to airport to get them. Still waiting. No information from Turkish airlines Very poor customer service I think booking through kayak it was wrong decision

2.0 MediocreAnonymous, Jun 2026
LAX - IST
Read more Turkish Airlines reviews

We fly Bussines class and we didn’t feel like it is. Out luggage didn’t arrive and we have to return again next day from our hotel to airport to get them. Still waiting. No information from Turkish airlines Very poor customer service I think booking through kayak it was wrong decision

Three screaming and crying children in business class made it very difficult to rest. The crew made no attempt to address the situation. I might as well have saved the money and flown economy. The parents were oblivious to the discomfort their children were causing. The lounge in Istanbul is wonderful, but did not make up for the misery on the flight. My business class seat power outlet was broken and I have a cpap. The crew couldn't fix it or move me to better seat. Fortunately , the passenger in front of me allowed me to plug into his power outlet.

Could have been better. Bag rechecking could have been eliminated. Gate location and direction need to be clearly stated.

It was crowded… the bathrooms dirty and smelly. The seats have been made even smaller.

Good overall. Seat spacing a bit tight between IST and ISB.

Excellent staff despite some trying passenger situations. Very impressed with their good attitudes and kindness.

Service was slow and checked bag was off last evening when flying business

Ordered Vegan meal - it was ok, but not exceptional. Seat ok row 39 middle section aisle. Nearly full flight - crew was busy but they did the best they could. There was a USB A port at the seat. I listened to my own music and only looked at flight information. One nice thing was the connection information was made available in the screen.

One of the worst check in process at the DIA as well as the boarding counter Changed seat at the last minute and assigned middle seat while I paid for window seat. Requested many times but to no avail . horrible customer service and very poor process Requesting refund for seat that was changed last minute

Pretty standard for long haul international flying. Food was fine, tv/movie selection was great, wifi did not work at all, crew was pleasant enough.

I needed internet for critical matters and it never worked.

Very easy ! Use the kiosk and bag drop and right to security within 10 min

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

This planes staff was top tier. Everything went great and had a great flight home.

Destroyed my suitcase. Tired of talking about it. Cancelling my unite mileage plus account.

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

It was a short flight so I was expecting too much

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

Ridiculous boarding. Enter the gate, walk down a staircase with bags, exit a building, get on a crowded bus, dropped off a few meters away from the aircraft, walk with bags to another set of stairs to board the aircraft. And all that during a pouring down rain, and with children. Ridiculous!!!

Lufthansa no longer offers any refreshments and snacks on short i.e., around 2 hrs flight. We still had full staff stewards/stewardesses. No idea why they were needed as there was no work for them during the flight

Very, very tight legroom. They must’ve jammed in an additional few rows of seat seating. Denver to Munich was the least legroom I’ve ever had on any flight, let alone a multi hour international journey. I will not take that flight again.

Very good, i got two seats for myself, and was comfortable with the blanket i got

Food is too little (in volume) and too spicy.. There are no snacks in the back of the plane in between meals.

We had a 1 1/2 hour delay before we left Denver. When we arrive to Frankfort, they didn’t announce that people with connecting flights to exit the plane first. My next flight was already boarding when we we taxiing in to the gate. I waited another 10 minutes to get off the plane. I had to run to catch my next flight. I mean run! I made it with one minute to spare, but my luggage did not. My luggage came two hours later on a different flight.

Both flights were delayed and we missed our connection. Our second flight was delayed 3 times. I have always had great service and never any problems with my flights on Lufthansa. My last two flights were, unfortunately, awful. I fly quite often to Germany and have had better luck with United than Lufthansa.

The agent, who took my mother to her gate, kept talking with one of her male coworkers and treating my mother like a sack of potatoes. She was ignoring my questions because she was too busy flirting with her male colleague. This was a very unprofessional behavior. We also had to wait for close to half an hour for an agent to arrive.

Very good flight, only problem is the boarding process where some peoples do not have manners and do not how to fly ( preparing your documents, oversized carry-ons, not understanding or feigning to not understand directives).

I really like it and travel to Europe and back with Lufthansa, but it is getting expensive, a bit beyond my me

Not available crew to load the luggage for all the passengers,comon situation for local European destinations , not acceptable situation, never Lufthansa again 😉 🙄

Flight was overbooked. Crew did a great job but passengers weren’t nice and really not patient. Flying in these times is not the best idea tbh.

Everything you need to know for your flight from Denver to Sofia

Information on your arrival and departure airports