$329+ Cheap flights from Denver (DEN) to Sofia (SOF)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/29. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
Oct 16 — Oct 231
Round-trip
1 adult, Economy
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Find cheap flights from Denver to Sofia with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Denver to Sofia
Cheapest
Best
Last-minute
One-way
Cheapest flights from Denver to SofiaExplore the most affordable flight options available from Denver to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2026.
Explore the most affordable flight options available from Denver to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2026.
This British Airways deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:35 pm -
1 stop15h 45m
Mon 11/25:15 pm -
1 stop30h 55m
Deal found 9/13![British Airways logo]()
$589
This FlightHub deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/124:05 pm -
1 stop17h 35m
Tue 11/246:00 am -
1 stop17h 30m
Deal found 9/11![Lufthansa logo]()
$616
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/118:25 pm -
1 stop17h 50m
Tue 11/246:00 am -
1 stop17h 30m
Deal found 9/11![United Airlines logo]()
$620
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:05 pm -
2 stops33h 05m
Tue 11/242:00 pm -
1 stop14h 05m
Deal found 9/11![United Airlines logo]()
$628
This Air Canada deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/114:17 pm -
2 stops34h 53m
Tue 11/246:25 am -
2 stops35h 12m
Deal found 9/11![Air Canada logo]()
$636
This oojo deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/114:05 pm -
1 stop22h 10m
Thu 10/226:10 am -
1 stop17h 10m
Deal found 9/14![Lufthansa logo]()
$637
This British Airways deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:05 pm -
1 stop17h 15m
Mon 11/95:15 pm -
1 stop30h 55m
Deal found 9/13![British Airways logo]()
$640
This Air Canada deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:05 pm -
2 stops33h 05m
Tue 11/246:25 am -
2 stops44h 39m
Deal found 9/11![Air Canada logo]()
$645
This oojo deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:15 pm -
1 stop21h 40m
Thu 11/56:00 am -
1 stop17h 30m
Deal found 9/13![Lufthansa logo]()
$656
Best flights from Denver to SofiaDiscover carefully curated flight deals from Denver to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2026.
Discover carefully curated flight deals from Denver to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2026.
This FlightHub deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/79:19 am -
2 stops22h 01m
Wed 2/179:05 pm -
2 stops29h 23m
Deal found 9/11![British Airways logo]()
$603
This FlightHub deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/124:05 pm -
1 stop17h 35m
Tue 11/246:00 am -
1 stop17h 30m
Deal found 9/11![Lufthansa logo]()
$616
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/118:25 pm -
1 stop17h 50m
Thu 11/266:00 am -
1 stop17h 30m
Deal found 9/11![United Airlines logo]()
$620
This Gotogate deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:40 pm -
2 stops20h 35m
Thu 11/262:10 pm -
2 stops29h 25m
Deal found 9/11![Multiple Airlines logo]()
$663
This FlightHub deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/82:33 pm -
2 stops44h 37m
Wed 2/179:05 pm -
2 stops34h 06m
Deal found 9/13![British Airways logo]()
$609
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:00 am -
2 stops33h 15m
Tue 11/242:00 pm -
1 stop14h 05m
Deal found 9/11![United Airlines logo]()
$625
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/84:15 pm -
1 stop21h 40m
Tue 2/166:25 am -
1 stop16h 15m
Deal found 9/11![United Airlines logo]()
$633
This British Airways deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:05 pm -
1 stop17h 15m
Mon 11/95:15 pm -
1 stop30h 55m
Deal found 9/13![British Airways logo]()
$640
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1811:35 am -
2 stops26h 25m
Mon 11/22:00 pm -
1 stop33h 30m
Deal found 9/13![United Airlines logo]()
$659
This FlightHub deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/162:29 pm -
2 stops44h 41m
Wed 10/289:05 pm -
2 stops34h 53m
Deal found 9/12![British Airways logo]()
$684
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:48 pm -
2 stops22h 07m
Thu 11/56:00 am -
1 stop22h 05m
Deal found 9/13![United Airlines logo]()
$675
Last-minute flights from Denver to SofiaDiscover last-minute flight deals from Denver to Sofia. Data last updated September 16, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Sofia. Data last updated September 16, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/118:25 pm -
1 stop17h 50m
Tue 11/246:00 am -
1 stop17h 30m
Deal found 9/11![United Airlines logo]()
$620
This Air Canada deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/114:17 pm -
2 stops34h 53m
Tue 11/246:25 am -
2 stops35h 12m
Deal found 9/11![Air Canada logo]()
$636
This oojo deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/114:05 pm -
1 stop22h 10m
Thu 10/226:10 am -
1 stop17h 10m
Deal found 9/14![Lufthansa logo]()
$637
This Gotogate deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:40 pm -
2 stops20h 35m
Thu 11/262:10 pm -
2 stops29h 25m
Deal found 9/11![Multiple Airlines logo]()
$663
This FlightHub deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/124:05 pm -
1 stop17h 35m
Tue 11/246:00 am -
1 stop17h 30m
Deal found 9/11![Lufthansa logo]()
$616
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:05 pm -
2 stops33h 05m
Tue 11/242:00 pm -
1 stop14h 05m
Deal found 9/11![United Airlines logo]()
$628
This Air Canada deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:05 pm -
2 stops33h 05m
Tue 11/246:25 am -
2 stops44h 39m
Deal found 9/11![Air Canada logo]()
$645
This British Airways deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:35 pm -
1 stop15h 45m
Mon 11/25:15 pm -
1 stop30h 55m
Deal found 9/13![British Airways logo]()
$589
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1811:35 am -
2 stops26h 25m
Mon 11/22:00 pm -
1 stop33h 30m
Deal found 9/13![United Airlines logo]()
$659
This oojo deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:15 pm -
1 stop21h 40m
Thu 11/56:00 am -
1 stop17h 30m
Deal found 9/13![Lufthansa logo]()
$656
One-way flights from Denver to SofiaSearch for one-way flight options from Denver to Sofia. Find affordable one-way fares based on user searches. Data last updated September 16, 2026.
Search for one-way flight options from Denver to Sofia. Find affordable one-way fares based on user searches. Data last updated September 16, 2026.
This Expedia deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/295:01 pm -
1 stop18h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![British Airways logo]()
$329
This Booking.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/114:15 pm -
1 stop21h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Lufthansa logo]()
$343
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/295:35 pm -
2 stops34h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![United Airlines logo]()
$362
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/93:40 pm -
3 stops38h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Multiple Airlines logo]()
$386
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1210:38 am -
3 stops26h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Multiple Airlines logo]()
$390
This Mytrip deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/1111:25 am -
3 stops26h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Multiple Airlines logo]()
$431
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/294:15 pm -
3 stops23h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Multiple Airlines logo]()
$457
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:40 pm -
3 stops37h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Multiple Airlines logo]()
$460
This KAYAK deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:25 pm -
1 stop17h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Lufthansa logo]()
$489
This Trip.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/224:15 pm -
1 stop21h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Lufthansa logo]()
$495
Find flight deals from Denver to Sofia
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Sofia (SOF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 16, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $589 (British Airways) |
One-way from | $329 (Expedia) |
Popular in | December |
Cheapest in | March |
Average price | $799 |
Cheapflights 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, Cheapflights users made 7,457,451 searches. Data last updated September 16, 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
Cheapest round-trip
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Tue 12/29
5:01 pm-8:10 pm
1 stop18h 09m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$329
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Tue 12/29
5:35 pm-1:15 pm
2 stops34h 40m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$362
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Mon 10/12
10:38 am-10:30 pm
3 stops26h 52m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$390
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Mon 1/11
11:25 am-11:10 pm
3 stops26h 45m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$431
Quickest round-trip
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Mon 10/12
8:25 pm-11:15 pm
1 stop17h 50m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$489
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Tue 12/22
4:15 pm-10:55 pm
1 stop21h 40m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$495
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Sun 10/11
8:30 pm-8:45 am
1 stop27h 15m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$559
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Tue 12/22
7:04 pm-1:25 pm
3 stops57h 21m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$559
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Wed 12/9
7:30 pm-3:10 pm
1 stop34h 40m
Sofia
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$564
DenverSofia
DEN Denver Intl - SOF Sofia
DENSOF
Denver Intl
Sun 2/7
9:19 am-4:20 pm
2 stops22h 01m
Sofia
Wed 2/17
9:05 pm-5:28 pm
2 stops29h 23m
$603
Showing 1-10 of 20 resultsSorted by cheapest first
Compare providers for flights from Denver to Sofia
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Sofia in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Denver-Sofia flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Denver-Sofia flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Denver-Sofia flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Denver-Sofia flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Sofia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Denver to Sofia
Have a flexible travel schedule? Discover the best time to fly to Sofia from Denver with our price prediction graph.
DEN-SOF
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Denver to Sofia
How far ahead should I book a flight from Denver to Sofia?
The price you pay for your flight from Denver to Sofia may vary depending on when you book. For the best chance of a lower fare, look to book 36 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Denver to Sofia?
Currently, March is the cheapest month in which you can book a flight from Denver to Sofia (average of $623). Flying from Denver to Sofia in December is currently the most expensive (average of $1,026). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Denver to Sofia?
Airfare is below average for this route at the moment.
Denver to Sofia flights typically cost between $772 and $927 in October.The cheapest round-trip price found within the last 5 days was $589 on British Airways (Oct 18-Nov 2).
Reviews of airlines servicing Sofia
Get insights into the airlines that provide service to Sofia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sofia. Reviews last updated September 16, 2026.
See what other customers who have flown with Turkish Airlines,United Airlines, andLufthansa from Denver to Sofia have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.3
Comfort
7.3
Crew
7.8
Food
7.5
Entertainment
7.5
Overall
7.4
Reviews
1 / 20
6.0
GoodAnonymous,Sep 2026
LAX - IST
Boarding
7.3
Comfort
7.3
Crew
7.8
Food
7.5
Entertainment
7.5
Overall
7.4
Reviews
1 / 20
6.0
GoodAnonymous,Sep 2026
LAX - IST
Boarding
7.3
Comfort
7.3
Crew
7.8
Food
7.5
Entertainment
7.5
Overall
7.4
Reviews
1 / 20
6.0
GoodAnonymous,Sep 2026
LAX - IST
Boarding
7.3
Comfort
7.3
Crew
7.8
Food
7.5
Entertainment
7.5
Overall
7.4
Reviews
1 / 20
6.0
GoodAnonymous,Sep 2026
LAX - IST
Related info for your journey
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Denver and Sofia flights
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Top 3 airlines flying from Denver to Sofia
Discover the top 3 airlines that operate flights from Denver to Sofia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$571 | Average$659 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$634 | Average$982 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$686 | Average$1,003 | FlexibilityNo cancel fee | On-time69% |