What are the cheapest airlines flying from St. Louis to Sofia round-trip?

Air Canada, at $1,189, was found to be the cheapest airline from St. Louis to Sofia.Alternate airlines to your destination round-trip include United Airlines and Lufthansa.

What is the cheapest day to fly from St. Louis to Sofia?

Travelers seeking maximum savings on their St. Louis to Sofia flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from St. Louis to Sofia?

It’s generally more expensive to depart on a Friday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

To save on the cost of your flight from St. Louis to Sofia, book at least 23 days before your planned departure. Booking around this time can save you about 82% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $1,034 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,166.

What is the cheapest month to fly from St. Louis to Sofia?

The best pricing can be found in the month of February. Prices to Sofia from St. Louis average $1,029. You can even find prices in February for less than $1,029, as users have found deals to Sofia from as low as $640. The month of June appears to be one of the more expensive times to travel to Sofia from St. Louis. Flying in the targeted month can save you up to 39%.

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

When flying from St. Louis to Sofia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 11% versus a flight in the afternoon.

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.

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.

$1,189+ Flights from St. Louis to Sofia - Compare & Save Big

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Find cheap flights from St. Louis 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.

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

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$1,189 (Air Canada)
Popular in	June
Cheapest in	February
Average price	$999

Provider with most accurate pricing for Lambert-St Louis-Sofia flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Sofia flights.

Search Deals

From Lambert-St Louis to Sofia

Search Deals

Highest demand for flights based on searches. 15% potential increase in price ($181 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($38 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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 30, 2025.

Wed 5/287:30 amSTL - SOF

2 stops26h 20mAir Canada

Tue 7/296:20 amSOF - STL

2 stops21h 40mAir Canada

Deal found 4/29

$1,189

Sun 5/187:30 amSTL - SOF

2 stops27h 10mMultiple Airlines

Fri 6/136:15 amSOF - STL

1 stop15h 15mMultiple Airlines

Deal found 4/30

$1,204

Sun 5/187:30 amSTL - SOF

2 stops19h 45mUnited Airlines

Fri 6/136:15 amSOF - STL

1 stop15h 15mUnited Airlines

Deal found 4/29

$1,307

Wed 5/73:30 pmSTL - SOF

1 stop18h 20mLufthansa

Sat 5/176:00 amSOF - STL

2 stops17h 47mLufthansa

Deal found 4/29

$1,494

Best flights from St. Louis to Sofia
Discover carefully curated flight deals from St. Louis to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2025.

Wed 5/287:30 amSTL - SOF

2 stops26h 20mAir Canada

Tue 7/296:20 amSOF - STL

2 stops21h 40mAir Canada

Deal found 4/29

$1,189

Sun 5/187:30 amSTL - SOF

2 stops27h 10mMultiple Airlines

Fri 6/136:15 amSOF - STL

1 stop15h 15mMultiple Airlines

Deal found 4/30

$1,204

Sun 5/187:30 amSTL - SOF

2 stops19h 45mUnited Airlines

Fri 6/136:15 amSOF - STL

1 stop15h 15mUnited Airlines

Deal found 4/29

$1,307

Sun 5/183:30 pmSTL - SOF

1 stop23h 20mLufthansa

Fri 6/136:15 amSOF - STL

1 stop15h 15mLufthansa

Deal found 4/30

$1,875

Last-minute flights from St. Louis to Sofia
Discover last-minute flight deals from St. Louis to Sofia. Data last updated April 30, 2025 and is based on user searches.

Wed 5/71:30 pmSTL - SOF

2 stops21h 10mAir Canada

Sat 5/176:15 amSOF - STL

2 stops21h 43mAir Canada

Deal found 4/29

$1,277

Wed 5/73:30 pmSTL - SOF

1 stop18h 20mLufthansa

Sat 5/176:00 amSOF - STL

2 stops17h 47mLufthansa

Deal found 4/29

$1,494

Sun 5/187:30 amSTL - SOF

2 stops27h 10mMultiple Airlines

Fri 6/136:15 amSOF - STL

1 stop15h 15mMultiple Airlines

Deal found 4/30

$1,204

Sun 5/187:30 amSTL - SOF

2 stops19h 45mUnited Airlines

Fri 6/136:15 amSOF - STL

1 stop15h 15mUnited Airlines

Deal found 4/29

$1,307

Wed 5/287:30 amSTL - SOF

2 stops26h 20mAir Canada

Tue 7/296:20 amSOF - STL

2 stops21h 40mAir Canada

Deal found 4/29

$1,189

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 5/28

7:30 am-5:50 pm

2 stops26h 20m

Sofia

Tue 7/29

6:20 am-8:00 pm

2 stops21h 40m

$1,189

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 5/18

7:30 am-6:40 pm

2 stops27h 10m

Sofia

Fri 6/13

6:15 am-1:30 pm

1 stop15h 15m

$1,204

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 5/18

7:30 am-11:15 am

2 stops19h 45m

Sofia

Fri 6/13

6:15 am-1:30 pm

1 stop15h 15m

$1,307

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 5/18

3:30 pm-10:50 pm

1 stop23h 20m

Sofia

Fri 6/13

6:15 am-1:30 pm

1 stop15h 15m

$1,875

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Compare providers for flights from St. Louis to Sofia

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.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	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 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?

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 $1,218). 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.

Rainfall in Sofia 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

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

Read reviews from past customers who have flown United Airlines, Air Canada and Lufthansa from St. Louis to Sofia. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,696 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

8,696 reviews

United Airlines

7.4

Good

8,696 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Air Canada

7.0

Good

9,244 reviews

United Airlines

7.4

Good

8,696 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Lufthansa

6.7

Okay

7,044 reviews

United Airlines

7.4

Good

8,696 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

What are the cheapest airlines flying from St. Louis to Sofia round-trip?
Air Canada, at $1,189, was found to be the cheapest airline from St. Louis to Sofia.Alternate airlines to your destination round-trip include United Airlines and Lufthansa.
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 $1,218). 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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Top 2 airlines flying from St. Louis to Sofia

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$711	Average$1,083	FlexibilityNo cancel fee	On-time69%
Lufthansa	Cheapest$737	Average$1,051	FlexibilityNo cancel fee	On-time76%

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$1,189+ 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Sofia with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from St. Louis to Sofia

Cheapest flights from St. Louis to SofiaExplore 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 30, 2025.

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 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

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.

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.

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 25, 2025.

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

Rainfall in Sofia by month

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

Temperature in Sofia by month

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

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 30, 2025.

Read reviews from past customers who have flown United Airlines, Air Canada and Lufthansa from St. Louis to Sofia. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Sofia

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from St. Louis to Sofia

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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 30, 2025.