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$761+ 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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SOF
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
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The best prices from Lambert-St Louis to Sofia are usually found in February or January, booked 28 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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$761
(United)

Popular in

June

Cheapest in

February

Average price

$640
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. 22% potential increase in price ($322 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This United deal was found by Cheapflights users on 2/20. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/136:15 amSTL - SOF
2 stops33h 10mUnited Airlines
Thu 3/276:05 amSOF - STL
2 stops22h 44mUnited Airlines
Deal found 2/20$761
This Gotogate deal was found by Cheapflights users on 2/20. 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 4/201:12 pmSTL - SOF
2 stops15h 53mLufthansa
Fri 5/96:15 amSOF - STL
1 stop15h 15mLufthansa
Deal found 2/20$807
This Booking.com deal was found by Cheapflights users on 2/20. 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.
Sun 4/201:12 pmSTL - SOF
2 stops20h 58mMultiple Airlines
Fri 5/96:15 amSOF - STL
2 stops21h 46mMultiple Airlines
Deal found 2/20$808
This Air Canada deal was found by Cheapflights users on 2/20. 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.
Wed 4/2310:40 amSTL - SOF
3 stops17h 20mAir Canada
Fri 6/66:15 amSOF - STL
2 stops21h 46mAir Canada
Deal found 2/20$1,124

Find flights from St. Louis to Sofia within your budget

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 February 20, 2025.

Fly from

St. Louis

Fly to

Sofia

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 3/13

6:15 am-10:25 pm

2 stops33h 10m

Sofia

Thu 3/27

6:05 am-9:49 pm

2 stops22h 44m

$761

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 4/20

1:12 pm-1:05 pm

2 stops15h 53m

Sofia

Fri 5/9

6:15 am-1:30 pm

1 stop15h 15m

$807

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 4/20

1:12 pm-6:10 pm

2 stops20h 58m

Sofia

Fri 5/9

6:15 am-8:01 pm

2 stops21h 46m

$808

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/23

10:40 am-12:00 pm

3 stops17h 20m

Sofia

Fri 6/6

6:15 am-8:01 pm

2 stops21h 46m

$1,124

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Sofia flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

Travel insights for flights from St. Louis to Sofia

Get recent, data-driven insights about flights from St. Louis to Sofia including ideal travel times, pricing trends, and more.

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 February 14, 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 February 20, 2025.
United Airlines
7.4
Good
8,766 reviews

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20

2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines
7.4
Good
8,766 reviews
United Airlines
7.4
Good
8,766 reviews

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20

2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Air Canada
7.0
Good
8,748 reviews
United Airlines
7.4
Good
8,766 reviews

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20

2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Lufthansa
6.7
Okay
6,984 reviews
United Airlines
7.4
Good
8,766 reviews

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 20

2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

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?

    United Airlines, at $761, was found to be the cheapest airline from St. Louis to Sofia.Alternate airlines to your destination round-trip include Lufthansa and Air Canada. Users have found that United Airlines is 31% 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$600Average$1,085FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$711Average$1,100FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$865Average$1,300FlexibilityNo cancel feeOn-time76%
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