DEN - SOF

$289 Find Cheap Flights from Denver to Sofia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Sofia departing on 10/9. 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

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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% 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.

Flights Deals
Booking Insights
Flights 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

Thu, Oct 30 - Tue, Dec 9
Turkish Airlines Logo
8:20 pm - 8:50 pmDEN-SOF
16h 30m1 stop
Turkish Airlines Logo
10:05 am - 5:35 pmSOF-DEN
16h 30m1 stop
$562Turkish Airlines
Find Deal
Thu, Oct 30 - Mon, Dec 8
Turkish Airlines Logo
8:20 pm - 9:15 amDEN-SOF
28h 55m1 stop
Turkish Airlines Logo
4:00 pm - 5:35 pmSOF-DEN
34h 35m1 stop
$566Turkish Airlines
Find Deal
Tue, Oct 28 - Mon, Dec 8
British Airways Logo
6:25 pm - 8:10 pmDEN-SOF
17h 45m1 stop
British Airways Logo
5:25 pm - 3:30 pmSOF-DEN
31h 05m1 stop
$598British Airways
Find Deal
Sun, Sep 14 - Wed, Mar 11
United Airlines Logo
8:20 pm - 11:00 pmDEN-SOF
17h 40m1 stop
United Airlines Logo
6:15 am - 7:55 pmSOF-DEN
21h 40m2 stops
$600United Airlines
Find Deal
Mon, Oct 27 - Tue, Dec 9
United Airlines Logo
5:20 pm - 10:45 pmDEN-SOF
21h 25m1 stop
United Airlines Logo
6:00 am - 1:40 pmSOF-DEN
16h 40m1 stop
$601United Airlines
Find Deal
Mon, Oct 27 - Thu, Dec 11
Air Canada Logo
3:53 pm - 6:20 pmDEN-SOF
42h 27m2 stops
Air Canada Logo
2:35 pm - 10:23 amSOF-DEN
28h 48m2 stops
$608Air Canada
Find Deal
Sun, Sep 14 - Mon, Mar 9
Lufthansa Logo
4:15 pm - 11:00 pmDEN-SOF
21h 45m1 stop
Lufthansa Logo
1:55 pm - 3:35 pmSOF-DEN
33h 40m1 stop
$613Lufthansa
Find Deal
Sun, Sep 14 - Fri, Mar 13
Air Canada Logo
9:58 am - 11:15 amDEN-SOF
16h 17m2 stops
Air Canada Logo
2:35 pm - 10:23 amSOF-DEN
27h 48m2 stops
$618Air Canada
Find Deal
Tue, Oct 28 - Sun, Dec 7
British Airways Logo
6:25 pm - 8:10 pmDEN-SOF
17h 45m1 stop
British Airways Logo
2:30 pm - 3:30 pmSOF-DEN
34h 00m1 stop
$648British Airways
Find Deal
Sun, Sep 14 - Sat, Mar 14
Lufthansa Logo
4:15 pm - 11:00 pmDEN-SOF
21h 45m1 stop
Lufthansa Logo
6:15 am - 5:00 pmSOF-DEN
18h 45m1 stop
$652Lufthansa
Find Deal
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?

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

The average price of all round-trip flights from Denver to Sofia clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Sofia on a Thursday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Denver to Sofia. For your return ticket, we recommend flying on a Friday and avoiding Thursdays for the best deals.

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 April, where tickets cost $535 (return) on average. On the other hand, the most expensive months are May and July, where the average cost of round-trip tickets is $1,282 and $1,265 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 1 week before departure. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$289
Best time to beat the crowds with an average 0% drop in price.
Most popular time to fly and prices are also 20% lower on average.
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 3 days, the lowest price for a flight from Denver to Sofia was $289 for a one-way ticket and $562 for a round-trip.

  • 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, and oneworld are the airline alliances operating flights between Denver and Sofia, with Star Alliance being the most commonly used for this route.

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

    The two airlines most popular with KAYAK users for flights from Denver to Sofia are United Airlines and Turkish Airlines. With an average price for the route of $857 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 $753 and an overall rating of 7.3.

  • 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
United AirlinesOverall score based on 8896 reviews
6.6Food
7.1Entertainment
7.7Boarding
8.1Crew
7.3Comfort
Airline reviews

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!!!

4.0 OkayAnonymous, Jul 2025MUC - SOF
Read more United Airlines reviews

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!!!

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

The seat and leg room was not good. The food and beverage service was good.

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

Overall, it was a good experience. Boarding was good and there was plenty of overhead bin space for everyone’s carryons (even when we boarded toward the end). Only improvement would be to offer trash service more regularly.

David went above and beyond to make our flight the best that it could be

The economy seat was so uncomfortable, had not enough leg room for 13 hours flight, front seat basket was broken and couldn’t hold anything, food quality was horrible( we got food poisoned ) we charged for logged which used to be free. We paid too much for this flight and very disappointed. Turkish air line better to make satisfy and respect people instead of find different way to scam people.

This is really the rating of two flights. JFK to IST then IST to NQZ. New York to Istanbul was good. Good crew and all positives. The flight to Astana was so bad that brought it all down. Crew was nonexistent above the minimum, seats were cramped, and it was hot on the plane. Turkish Airlines seems to be slipping down to US based carriers level.

The 2 agents on the check in counter were super nice , helpful and very polite. Boarding was like a 1 2 3, I would recommend Turkish airlines for your next trip.

Everything was very good, except that the plane was an hour and a half late

flight with heavy turbulence old boeing 777 rest wasnt clean dashboard doesn’t work

Light and recline did not work on my seat. Very uncomfortable and could not read in the dark

Bad experience; they are not good anymore. They charge too much for luggage seat are so uncomfortable, Flight delays which may miss your next flight, they don’t care if you miss the flight or not. Zero customer services for front desk representatives Istanbul's airport I’m not using this airline any more.

I’ve been traveling for 20 years. I tried Turkish airline for the first time horrible horrible service and it would be my last time even if I get offer for a free ticket, I will not accept it. They have races and the worst Flight attendant

It wasn't good. I didn’t understand. They changed 320 dollars for 2 luggage. My ticket was regular and I paid almost 1200.00 dollars. Why they did charge? I want my money back.. thanks Yılmaz polat

Very punctual, the onboard staff was friendly and correct, the flight was fortunately very calm, the toilets were clean, in short, an excellent experience Thanks

Insulting. Lufthansa flight from Munich to EWR had us getting our luggage when we were told in Florence that it would follow us to Indianapolis. It did not. Then very slow security in EWR caused me and three other passengers from Lufthansa flight from Munich to miss the boarding closure. Behind me were two elderly grandparents and their ten year old grandson. We were all refused entry on a plane to Indy that was still at the gate. The doors had not even closed inside the terminal yet. No apologies or compensation offered. Not even a meal voucher let alone a free hotel stay for our inconvenience. I m not sure what the other three passengers behind me did ( they were elderly with a grandson, recall), but I stated 12 hours overnight in a chilly EWR airport until next flight to Indy at 850 next morning.

The food could be better, more snacks. And have some plugs to chargue the phone.

The pasta in the evening meal was tasteless. Otherwise, the flight was okay.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Seating was average for a first class seat. It very modern. I expected better.

Flight was a little late. The crew was courteous, food ok

Bad! Disaster!! The LH419 was cancelled after 4 hrs on board with no AC and no toilets

Poor food on flight between Toronto and Stockholm Airport Toronto too crowded

Extremely pleased with the crew. Best flight attendants ever! Very friendly, genuinely caring and attentive.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

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

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.