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$573+ Cheap flights from St. Louis (STL) 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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SOF
ene. 26 — feb. 21
dom. 1/26
dom. 2/2
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 enero 21, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$678
(United)

One-way from

$573
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$751
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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One-way flight from Lambert-St Louis to Sofia
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Highest demand for flights based on searches. 23% potential increase in price ($333 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 January 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 enero 21, 2025.

This United deal was found by Cheapflights users on 1/21. 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.
jue. 3/138:25 amSTL - SOF
2 stops21h 35mUnited Airlines
jue. 3/276:10 amSOF - STL
2 stops22h 24mUnited Airlines
Deal found 1/21$678
This Air Canada deal was found by Cheapflights users on 1/21. 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.
jue. 3/133:25 pmSTL - SOF
3 stops19h 30mMultiple Airlines
jue. 3/272:25 pmSOF - STL
2 stops31h 41mMultiple Airlines
Deal found 1/21$790
This Air Canada deal was found by Cheapflights users on 1/21. 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.
jue. 3/133:25 pmSTL - SOF
3 stops19h 30mAir Canada
jue. 3/272:25 pmSOF - STL
3 stops28h 47mAir Canada
Deal found 1/21$877
This CrystalTravel deal was found by Cheapflights users on 1/21. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 4/233:30 pmSTL - SOF
1 stop13h 45mLufthansa
mié. 6/46:15 amSOF - STL
1 stop15h 15mLufthansa
Deal found 1/21$948

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 enero 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

jue. 3/13

8:25 am-1:00 pm

2 stops21h 35m

Sofia

jue. 3/27

6:10 am-9:34 pm

2 stops22h 24m

$678

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

jue. 3/13

3:25 pm-5:55 pm

3 stops19h 30m

Sofia

jue. 3/27

2:25 pm-3:06 pm

2 stops31h 41m

$790

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

jue. 3/13

3:25 pm-5:55 pm

3 stops19h 30m

Sofia

jue. 3/27

2:25 pm-12:12 pm

3 stops28h 47m

$877

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

mié. 4/23

3:30 pm-1:15 pm

1 stop13h 45m

Sofia

mié. 6/4

6:15 am-1:30 pm

1 stop15h 15m

$948

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

dom. 7/13

5:22 pm-10:50 am

3 stops57h 28m

$573

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

dom. 7/13

6:15 pm-7:10 pm

2 stops16h 55m

$685

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

dom. 7/13

3:30 pm-1:05 pm

1 stop13h 35m

$689

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice 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.

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 January 17, 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 enero 21, 2025.
United Airlines
7.4
Good
8,985 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 10

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!

United Airlines
7.4
Good
8,985 reviews
United Airlines
7.4
Good
8,985 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 10

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!

American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,985 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 10

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!

Air Canada
7.0
Good
8,635 reviews
United Airlines
7.4
Good
8,985 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 10

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!

Lufthansa
6.8
Okay
7,111 reviews
United Airlines
7.4
Good
8,985 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.7

Boarding

7.7

Entertainment

7.1

Reviews

1 / 10

United Airlines flights seem to always use a bus to/from the boarding gate to the plane. Can they not get their own gate? This time there was no lift when leaving the plane and people in wheelchairs somehow had to climb down the steps to the ground to get to the bus. I udon’t know how some managed that!

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 $678, was found to be the cheapest airline from St. Louis to Sofia.Alternate airlines to your destination round-trip include Air Canada and Lufthansa. Users have found that United Airlines is 37% 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

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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 enero 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$600Average$1,085FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$712Average$1,108FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$773Average$1,357FlexibilityNo cancel feeOn-time76%
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