SOF - DEN

$835 Find Cheap Flights from Sofia to Denver

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sofia to Denver departing on 3/9. 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 Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sofia to Denver, 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 Sofia to Denver, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$835
United Airlines
Mon 3/9Sun 3/15
SOF - DEN • 1 stop
Top airlines
United Airlines
Cheapest • from $835 (round-trip)
United Airlines
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 Sofia and Denver. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Istanbul (IST)
Cheapest • Avg $889 (round-trip)
Munich (MUC)
Shortest trip • 16h 10m (one-way)
Insights
Insights
Insights
Insights
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 Denver!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Sofia to Denver (SOF-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Sofia to Denver 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 Sofia to Denver

Mon, Mar 9 - Sun, Mar 15
United Airlines Logo
6:10 am - 5:00 pm
SOF
-
DEN
18h 50m
1 stop
United Airlines Logo
9:20 pm - 6:20 pm
DEN
-
SOF
13h 00m
1 stop
$835United Airlines
Tue, Mar 24 - Wed, Apr 1
United Airlines Logo
6:00 am - 7:40 pm
SOF
-
DEN
21h 40m
2 stops
United Airlines Logo
4:05 pm - 6:40 pm
DEN
-
SOF
17h 35m
1 stop
$841United Airlines
Tue, Mar 24 - Wed, Apr 1
Lufthansa Logo
2:00 pm - 7:55 pm
SOF
-
DEN
13h 55m
1 stop
Lufthansa Logo
4:05 pm - 6:40 pm
DEN
-
SOF
17h 35m
1 stop
$848Lufthansa
Mon, Mar 9 - Sun, Mar 15
United Airlines Logo
6:10 am - 6:08 pm
SOF
-
DEN
19h 58m
2 stops
United Airlines Logo
12:33 pm - 1:35 pm
DEN
-
SOF
17h 02m
2 stops
$851United Airlines
Tue, Jun 23 - Tue, Jul 21
United Airlines Logo
6:10 am - 1:30 pm
SOF
-
DEN
16h 20m
1 stop
United Airlines Logo
4:15 pm - 6:40 pm
DEN
-
SOF
17h 25m
1 stop
$870United Airlines
Tue, Jun 23 - Tue, Jul 21
United Airlines Logo
6:10 am - 1:30 pm
SOF
-
DEN
16h 20m
1 stop
United Airlines Logo
4:20 pm - 6:40 pm
DEN
-
SOF
17h 20m
2 stops
$875United Airlines
Tue, Jun 23 - Tue, Jul 21
United Airlines Logo
6:10 am - 1:30 pm
SOF
-
DEN
16h 20m
1 stop
United Airlines Logo
3:50 pm - 6:00 pm
DEN
-
SOF
17h 10m
2 stops
$876United Airlines
Mon, Mar 9 - Sun, Mar 15
Multiple Airlines Logo
10:20 am - 7:05 pm
SOF
-
DEN
16h 45m
2 stops
Multiple Airlines Logo
11:15 am - 10:50 pm
DEN
-
SOF
27h 35m
3 stops
$1,370Multiple Airlines
Mon, Mar 9 - Sun, Mar 15
Multiple Airlines Logo
2:35 pm - 6:35 pm
SOF
-
DEN
36h 00m
3 stops
Multiple Airlines Logo
11:15 am - 5:50 pm
DEN
-
SOF
22h 35m
3 stops
$1,445Multiple Airlines
Booking Insights

KAYAK's insights & trends for Sofia to Denver flights

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

Which airlines provide the cheapest flights from Sofia to Denver?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Sofia to Denver were found on United Airlines ($835) and Lufthansa ($848).

Good to know

Low seasonFebruary
Cheapest flight$835
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly and prices are also 13% lower on average.
Flight from Sofia to Denver

When to book flights from Sofia to Denver

Are your dates flexible? Find out the best times to travel from Sofia to Denver 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 Sofia to Denver

  • What is the cheapest flight from Sofia to Denver?

    In the last 3 days, the lowest price for a flight from Sofia to Denver was $835 for a round-trip ticket.

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

    Yes, you’ll need a passport to travel to Denver from Sofia.

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

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

  • Which airline alliances offer flights from Sofia to Denver?

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

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

    The two airlines most popular with KAYAK users for flights from Sofia to Denver are United Airlines and Turkish Airlines. With an average price for the route of $861 and an overall rating of 7.4, United Airlines is the most popular choice. Turkish Airlines is also a great choice for the route, with an average price of $840 and an overall rating of 7.3.

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

    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 Sofia to Denver.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Sofia 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 Sofia to Denver?

    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 Denver with an airline and back to Sofia with another airline. Booking your flights between Sofia and DEN 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 Sofia to Denver?

    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 Denver from Sofia 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 Sofia to Denver

 
See real verified KAYAK customer reviews for airlines flying from Sofia to Denver. 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 Sofia to Denver? 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
United AirlinesOverall score based on 9343 reviews
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
7.7Boarding
Airline reviews

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

8.0 ExcellentMaureen, Feb 2026
SMF - DEN
Read more United Airlines reviews

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

As great a red-eye flight as red-eye flights can be.

Both of my flights arrived early and check in process was smooth

Everything was on time Will use united again for sure

I just think it’s unfortunate that Airlines have completely abandoned the idea of serving any kind of decent or even real food on flights, not even on a four hour flight!? Those days are gone, I guess.

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Flight was delayed. De-icing took a while. When we landed had to wait for another plane to vacate our gate. Just an overall bad experience.

Not good - outbound flight was delayed and missed my connection even though I got to the gate after running through the airport - the agent would not let me on because the door was closed (flight had not left). There was no notification from United - overall experience was very disappointing. Additionally, I was downgraded from first class to coach on the alternative flight

United have really come back. Airport and boarding process is clear and good, app and information also very good

Delicious food, comfortable and clean plane. It's a little cramped in the hall in front of the gate.

Very hot cabin made long flight uncomfortable, even in business class! Food was great. Istanbul business lounge had great food but too few bathrooms and seating . They also need more electric outlets for charging devices. Appreciate the ability to go through fast track lines w business class

The crew on this flight provided exceptional business class service to me.

The staff at the boarding or the rudest uninformative and no English whatsoever they’re very rude as if they are envious of you travelling I don’t understand how could someone would be this rude and this out of touch and cold

You charged me for luggage although the airline does not- you charged me for seat when customers can pick their own seat at checkout in I travel to Europe slot and I will not use kayak again

The seats were extremely small. Boarding was not communicated correctly. It wasn’t a pleasant trip.

They oversold the tickets by one which was my ticket so I didn’t have a ticket till last second

Not good. I was supposed to be in Mint but got in economy class

Requested food options were always finished. Supplied food items were good but of course not the desired choices.

The airport staff never announced that boarding has started. Both at iad or Islamabad or Istanbul.

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Excellent service; they helped me reschedule so I can fly in an earlier flight

Wonderful staff. The boarding process can be improved a little better by adequate prior communication but all in all they did fine. However the boarding gate was quite unfreindly to elderly and who needs help with sevral stairs.

Flight map did not work. Crew was great, food was good, plane took off on time and landed early. That's all I can ask.

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Very good. Comfortable and I felt well taken care of from start to finish

Bulkhead seats should not be an extra charge. They are extremely uncomfortable. And we missed our connecting flight due to slow luggage retreaval.

Not great - seats were very narrow and food was terrible.

Some of the crew was sassy and not super helpful. The food was okay, but it seems like they were all unprepared compared to my flight I did from JFK to Frankfurt

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

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

Information on your arrival and departure airports