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$517+ Cheap flights from Denver (DEN) to Sofia (SOF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SOF
may. 6 — may. 131
mar. 5/6
mar. 5/13
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to Sofia are usually found in April or February, booked 48 days in advance, depart on a Thursday or Sunday and return on a Friday

Cheap 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 mayo 1, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$639
(FlightHub)

One-way from

$517
(American Airlines)

Popular in

June

Cheapest in

April

Average price

$1,337
Provider with most accurate pricing for Denver Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Sofia flights.
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From Denver Intl to Sofia
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One-way flight from Denver Intl to Sofia
Search Deals
Highest demand for flights based on searches. 30% potential increase in price ($396 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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Find flight deals from Denver to Sofia

Cheapest flights from Denver to Sofia
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 mayo 1, 2025.

This Air Canada deal was found by Cheapflights users on 4/30. 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.
sáb. 11/157:15 pmDEN - SOF
2 stops37h 55mAir Canada
mié. 11/266:00 amSOF - DEN
2 stops43h 35mAir Canada
Deal found 4/30$639
This Turkish Airlines deal was found by Cheapflights users on 4/30. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/157:35 pmDEN - SOF
1 stop34h 30mTurkish Airlines
mié. 11/263:55 pmSOF - DEN
1 stop34h 45mTurkish Airlines
Deal found 4/30$642
This FlightHub deal was found by Cheapflights users on 4/30. 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.
lun. 11/174:25 pmDEN - SOF
1 stop16h 45mMultiple Airlines
vie. 11/286:00 amSOF - DEN
2 stops19h 38mMultiple Airlines
Deal found 4/30$644
This United Airlines deal was found by Cheapflights users on 4/30. 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.
mar. 11/188:20 pmDEN - SOF
1 stop12h 50mUnited Airlines
mar. 12/26:00 amSOF - DEN
2 stops19h 38mUnited Airlines
Deal found 4/30$645
This FlightHub deal was found by Cheapflights users on 4/30. 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.
lun. 11/174:25 pmDEN - SOF
1 stop16h 45mLufthansa
vie. 11/286:05 amSOF - DEN
1 stop17h 35mLufthansa
Deal found 4/30$649
This SWISS deal was found by Cheapflights users on 4/29. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/155:50 pmDEN - SOF
1 stop33h 40mSWISS
mar. 8/191:15 pmSOF - DEN
1 stop36h 05mSWISS
Deal found 4/29$789
This British Airways deal was found by Cheapflights users on 4/29. 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.
dom. 6/156:35 pmDEN - SOF
1 stop15h 35mBritish Airways
mié. 8/209:30 pmSOF - DEN
1 stop27h 55mBritish Airways
Deal found 4/29$809
This Austrian Airlines deal was found by Cheapflights users on 4/29. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 6/135:40 pmDEN - SOF
2 stops39h 30mAustrian Airlines
mié. 8/206:55 pmSOF - DEN
2 stops30h 40mAustrian Airlines
Deal found 4/29$1,122

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 2,558,603 searches. Data last updated mayo 1, 2025.
Use the filters below to find and compare flights from Denver to Sofia that are best for you.

Fly from

Denver

Fly to

Sofia

Route

Depart

Return

Price

DenverSofia

DEN - SOF

DENSOF

Denver Intl

jue. 9/4

7:50 pm-8:25 pm

1 stop15h 35m

Sofia

mar. 9/9

9:25 am-5:55 pm

1 stop17h 30m

$639

DenverSofia

DEN - SOF

DENSOF

Denver Intl

jue. 9/4

8:20 pm-11:00 pm

1 stop17h 40m

Sofia

mar. 9/9

2:00 pm-10:14 am

2 stops29h 14m

$735

DenverSofia

DEN - SOF

DENSOF

Denver Intl

jue. 9/4

7:45 am-11:15 am

2 stops18h 30m

Sofia

mar. 9/9

12:00 pm-10:14 am

2 stops31h 14m

$745

DenverSofia

DEN - SOF

DENSOF

Denver Intl

dom. 6/15

5:50 pm-12:30 pm

1 stop33h 40m

Sofia

mar. 8/19

1:15 pm-4:20 pm

1 stop36h 05m

$789

DenverSofia

DEN - SOF

DENSOF

Denver Intl

dom. 6/15

11:59 pm-12:00 pm

2 stops27h 01m

Sofia

mar. 8/19

1:15 pm-4:20 pm

1 stop36h 05m

$796

DenverSofia

DEN - SOF

DENSOF

Denver Intl

dom. 6/15

6:35 pm-7:10 pm

1 stop15h 35m

Sofia

mié. 8/20

9:30 pm-4:25 pm

1 stop27h 55m

$809

DenverSofia

DEN - SOF

DENSOF

Denver Intl

sáb. 6/14

4:15 pm-11:00 pm

1 stop21h 45m

Sofia

mié. 8/20

6:00 am-1:45 pm

1 stop16h 45m

$864

DenverSofia

DEN - SOF

DENSOF

Denver Intl

vie. 6/13

5:40 pm-6:10 pm

2 stops39h 30m

Sofia

mié. 8/20

6:55 pm-4:35 pm

2 stops30h 40m

$1,122

DenverSofia

DEN - SOF

DENSOF

Denver Intl

mié. 9/10

6:35 pm-1:30 pm

1 stop33h 55m

$517

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
FlightnetworkPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Denver-Sofia flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Denver-Sofia flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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.
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?

Use this chart to determine the optimal time to book a round-trip flight from Denver to Sofia. Price data was last updated on April 25, 2025.

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 48 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, November is the cheapest month in which you can book a flight from Denver to Sofia (average of $632). Flying from Denver to Sofia in June is currently the most expensive (average of $1,218). 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.

What is the cheapest time of day to fly from DEN to SOF?

Find hourly flight availability from Denver to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated mayo 1, 2025.

It’s typically best to fly out from Denver to Sofia in the evening. Doing so could potentially save you 41% on the flight price compared to flying in the morning, which is usually more expensive.

Rainfall in Sofia by month

Plan your trip to Sofia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sofia ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Sofia when rainfall is around 1.2 in.

Temperature in Sofia by month

Plan your trip to Sofia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sofia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 mayo 1, 2025.
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Crew

8.1

Entertainment

6.7

Overall

7.6

Boarding

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Austrian Airlines
7.6
Good
780 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Crew

8.1

Entertainment

6.7

Overall

7.6

Boarding

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
SWISS
7.5
Good
1,588 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Crew

8.1

Entertainment

6.7

Overall

7.6

Boarding

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
United Airlines
7.4
Good
8,696 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Crew

8.1

Entertainment

6.7

Overall

7.6

Boarding

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Turkish Airlines
7.3
Good
3,790 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Crew

8.1

Entertainment

6.7

Overall

7.6

Boarding

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
American Airlines
7.2
Good
10,000 reviews
Austrian Airlines
7.6
Good
780 reviews

Food

6.7

Comfort

7.3

Crew

8.1

Entertainment

6.7

Overall

7.6

Boarding

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.

Related info for your journey

Find useful and relevant information for your journey from Denver to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Denver to Sofia round-trip?

    Our cheapest airline available from Denver to Sofia is Turkish Airlines. Our recent data shows that you can find tickets from as low as $639 on this airline. Additional options worth looking into are United Airlines and Air Canada, starting at $735 and $745 round-trip. Turkish Airlines is currently priced 30% below the average price you’ll pay for this route.

  • Can I find deals for flights from Denver to Sofia that include hotel bookings?

    Yes. In addition to deals on Denver to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Sofia.

  • Can I find deals for business class flights from Denver to Sofia?

    Yes. Cheapflights offers flight deals from Denver to Sofia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Denver to Sofia?

    Currently, November is the cheapest month in which you can book a flight from Denver to Sofia (average of $632). Flying from Denver to Sofia in June is currently the most expensive (average of $1,218). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Denver to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
Grand Junction to Sofia flights

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 2,558,603 searches. Data last updated mayo 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$531Average$727FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$687Average$967FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$759Average$1,200FlexibilityNo cancel feeOn-time76%

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