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Sofia

$659+ Cheap flights from St. Louis (STL) 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 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SOF
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Sofia are usually found in February or January, booked 27 days in advance, depart on a Saturday or Sunday and return on a Tuesday

Cheap flight deals from St. Louis to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) 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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$659
(Air Canada)

Popular in

June

Cheapest in

February

Average price

$999
Provider with most accurate pricing for Lambert-St Louis-Sofia flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Sofia flights.
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From Lambert-St Louis to Sofia
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Highest demand for flights based on searches. 17% potential increase in price ($221 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from St. Louis to Sofia

Cheapest flights from St. Louis to Sofia
Explore the most affordable flight options available from St. Louis to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

This Air Canada deal was found by Cheapflights users on 4/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/171:30 pmSTL - SOF
2 stops21h 10mAir Canada
Thu 9/46:00 amSOF - STL
2 stops45h 57mAir Canada
Deal found 4/15$659
This FlightHub deal was found by Cheapflights users on 4/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/203:30 pmSTL - SOF
1 stop13h 45mLufthansa
Tue 9/26:20 amSOF - STL
2 stops17h 24mLufthansa
Deal found 4/15$671
This Air France deal was found by Cheapflights users on 4/16. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2411:51 amSTL - SOF
2 stops18h 09mMultiple Airlines
Thu 9/47:00 amSOF - STL
2 stops16h 58mMultiple Airlines
Deal found 4/16$672
This United Airlines deal was found by Cheapflights users on 4/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/203:30 pmSTL - SOF
1 stop13h 45mUnited Airlines
Thu 9/46:00 amSOF - STL
2 stops25h 44mUnited Airlines
Deal found 4/15$673
This Air France deal was found by Cheapflights users on 4/17. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2411:51 amSTL - SOF
2 stops18h 09mAir France
Sat 9/67:00 amSOF - STL
2 stops24h 01mAir France
Deal found 4/17$812
This British Airways deal was found by Cheapflights users on 4/17. 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 8/248:01 pmSTL - SOF
2 stops15h 09mBritish Airways
Sun 9/79:10 pmSOF - STL
2 stops29h 58mBritish Airways
Deal found 4/17$1,149
This Austrian Airlines deal was found by Cheapflights users on 4/15. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/171:25 pmSTL - SOF
2 stops14h 15mAustrian Airlines
Sat 8/304:05 pmSOF - STL
2 stops34h 08mAustrian Airlines
Deal found 4/15$1,260
This Turkish Airlines deal was found by Cheapflights users on 4/15. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/205:30 pmSTL - SOF
2 stops31h 05mTurkish Airlines
Sat 8/309:15 pmSOF - STL
2 stops26h 29mTurkish Airlines
Deal found 4/15$1,456

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis 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 April 17, 2025.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

St. Louis

Fly to

Sofia

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/17

1:30 pm-6:40 pm

2 stops21h 10m

Sofia

Thu 9/4

6:00 am-7:57 pm

2 stops45h 57m

$659

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 8/20

3:30 pm-1:15 pm

1 stop13h 45m

Sofia

Tue 9/2

6:20 am-3:44 pm

2 stops17h 24m

$671

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/24

11:51 am-2:00 pm

2 stops18h 09m

Sofia

Thu 9/4

7:00 am-3:58 pm

2 stops16h 58m

$672

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 8/20

3:30 pm-1:15 pm

1 stop13h 45m

Sofia

Thu 9/4

6:00 am-11:44 pm

2 stops25h 44m

$673

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/24

11:51 am-2:00 pm

2 stops18h 09m

Sofia

Sat 9/6

7:00 am-11:01 pm

2 stops24h 01m

$812

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/24

8:01 pm-7:10 pm

2 stops15h 09m

Sofia

Sun 9/7

9:10 pm-7:08 pm

2 stops29h 58m

$1,149

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/17

1:25 pm-11:40 am

2 stops14h 15m

Sofia

Sat 8/30

4:05 pm-6:13 pm

2 stops34h 08m

$1,260

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 8/20

5:30 pm-8:35 am

2 stops31h 05m

Sofia

Sat 8/30

9:15 pm-3:44 pm

2 stops26h 29m

$1,456

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Compare providers for flights from St. Louis 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 St. Louis to Sofia in April.
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

*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 St. Louis-Sofia flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Sofia flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from St. Louis-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-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 St. Louis-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 St. Louis to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from St. Louis 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 St. Louis to Sofia

How far ahead should I book a flight from St. Louis to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Sofia. Price data was last updated on April 11, 2025.

The best time to book flights from St. Louis to Sofia is 22 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to Sofia?

Currently, November is the cheapest month in which you can book a flight from St. Louis to Sofia (average of $632). Flying from St. Louis to Sofia in June is currently the most expensive (average of $1,243). 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.

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 April 17, 2025.
Austrian Airlines
7.6
Good
775 reviews

Boarding

7.6

Overall

7.6

Food

6.7

Crew

8.1

Comfort

7.3

Entertainment

6.8

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
775 reviews
Austrian Airlines
7.6
Good
775 reviews

Boarding

7.6

Overall

7.6

Food

6.7

Crew

8.1

Comfort

7.3

Entertainment

6.8

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.
Air France
7.5
Good
1,435 reviews
Austrian Airlines
7.6
Good
775 reviews

Boarding

7.6

Overall

7.6

Food

6.7

Crew

8.1

Comfort

7.3

Entertainment

6.8

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
8,667 reviews
Austrian Airlines
7.6
Good
775 reviews

Boarding

7.6

Overall

7.6

Food

6.7

Crew

8.1

Comfort

7.3

Entertainment

6.8

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
3,769 reviews
Austrian Airlines
7.6
Good
775 reviews

Boarding

7.6

Overall

7.6

Food

6.7

Crew

8.1

Comfort

7.3

Entertainment

6.8

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.
Air Canada
7.0
Good
9,142 reviews
Austrian Airlines
7.6
Good
775 reviews

Boarding

7.6

Overall

7.6

Food

6.7

Crew

8.1

Comfort

7.3

Entertainment

6.8

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 St. Louis 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 St. Louis to Sofia round-trip?

    Air Canada, at $659, was found to be the cheapest airline from St. Louis to Sofia.Alternate airlines to your destination round-trip include Lufthansa and United Airlines. Users have found that Air Canada is 36% cheaper than the other options available to this destination.

  • Can I find deals for flights from St. Louis to Sofia that include hotel bookings?

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

  • How can I find direct flights from St. Louis to Sofia?

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

  • Can I find deals for business class flights from St. Louis to Sofia?

    Yes. Cheapflights offers flight deals from St. Louis 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 St. Louis to Sofia?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Sofia (average of $632). Flying from St. Louis to Sofia in June is currently the most expensive (average of $1,243). 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 St. Louis to Sofia

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

Top 3 airlines flying from St. Louis to Sofia

Discover the top 3 airlines that operate flights from St. Louis 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$711Average$1,100FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$734Average$1,091FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$972Average$1,088FlexibilityNo cancel feeOn-time67%

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