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Bulgaria

$547+ Cheap flights from St. Louis (STL) to Bulgaria

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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SOF
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from St. Louis to Bulgaria

Cheapest flights from St. Louis to Bulgaria
Explore the most affordable flight options available from St. Louis to Bulgaria. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This United Airlines deal was found by Cheapflights users on 1/28. 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.
Thu 2/2611:25 am
STL
-
SOF
2 stops27h 20m
United Airlines
Mon 3/26:10 am
SOF
-
STL
2 stops22h 16m
United Airlines
Deal found 1/28$547
This Justfly.com deal was found by Cheapflights users on 1/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/16:55 pm
STL
-
SOF
2 stops15h 25m
Multiple Airlines
Sat 3/76:15 pm
SOF
-
STL
2 stops36h 36m
Multiple Airlines
Deal found 1/27$595
This FlightHub deal was found by Cheapflights users on 1/27. 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.
Sun 3/16:55 pm
STL
-
SOF
2 stops19h 50m
Lufthansa
Sat 3/72:25 pm
SOF
-
STL
1 stop31h 30m
Lufthansa
Deal found 1/27$600
This Gotogate deal was found by Cheapflights users on 1/28. 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.
Wed 5/207:30 am
STL
-
SOF
2 stops20h 40m
Multiple Airlines
Wed 5/276:20 am
SOF
-
STL
1 stop15h 05m
Multiple Airlines
Deal found 1/28$687
This United Airlines deal was found by Cheapflights users on 1/28. 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 5/207:30 am
STL
-
SOF
2 stops31h 20m
United Airlines
Wed 5/276:20 am
SOF
-
STL
2 stops21h 45m
United Airlines
Deal found 1/28$705
This Gurufare deal was found by Cheapflights users on 1/28. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/203:30 pm
STL
-
SOF
1 stop13h 55m
Lufthansa
Wed 5/276:20 am
SOF
-
STL
1 stop15h 05m
Lufthansa
Deal found 1/28$997
This Gurufare deal was found by Cheapflights users on 1/26. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:25 am
STL
-
SOF
2 stops30h 45m
Lufthansa
Tue 8/46:10 am
SOF
-
STL
1 stop15h 15m
Lufthansa
Deal found 1/26$1,019

Find flight deals from St. Louis to Bulgaria

Keep the following information in mind while searching for St. Louis to Bulgaria flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$547
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$528
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 Bulgaria
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($244 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Bulgaria 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 January 29, 2026.
Use the filters below to find and compare flights from St. Louis to Bulgaria that are best for you.

Fly from

St. Louis

Fly to

Bulgaria

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 2/26

11:25 am-10:45 pm

2 stops27h 20m

Sofia

Mon 3/2

6:10 am-8:26 pm

2 stops22h 16m

$547

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 3/1

6:55 pm-6:20 pm

2 stops15h 25m

Sofia

Sat 3/7

6:15 pm-10:51 pm

2 stops36h 36m

$595

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 3/1

6:55 pm-10:45 pm

2 stops19h 50m

Sofia

Sat 3/7

2:25 pm-1:55 pm

1 stop31h 30m

$600

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 5/20

7:30 am-12:10 pm

2 stops20h 40m

Sofia

Wed 5/27

6:20 am-1:25 pm

1 stop15h 05m

$687

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 5/20

7:30 am-10:50 pm

2 stops31h 20m

Sofia

Wed 5/27

6:20 am-8:05 pm

2 stops21h 45m

$705

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 5/20

3:30 pm-1:25 pm

1 stop13h 55m

Sofia

Wed 5/27

6:20 am-1:25 pm

1 stop15h 05m

$997

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 7/1

8:25 am-11:10 pm

2 stops30h 45m

Sofia

Tue 8/4

6:10 am-1:25 pm

1 stop15h 15m

$1,019

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Best time to book a flight from St. Louis to Bulgaria

Have a flexible travel schedule? Discover the best time to fly to Bulgaria 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 Bulgaria
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Bulgaria

Get insights into the airlines that provide service to Bulgaria. 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 Bulgaria. Reviews last updated January 29, 2026.
Get a feel of what it's like to fly with United Airlines and Lufthansa from St. Louis to Bulgaria by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,215 reviews

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,215 reviews
United Airlines
7.4
Good
9,215 reviews

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Lufthansa
6.8
Okay
7,754 reviews
United Airlines
7.4
Good
9,215 reviews

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

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

  • What airport do you fly from for flights from St. Louis to Bulgaria?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Bulgaria from St. Louis.

  • How long is the flight from St. Louis to Bulgaria?

    United Airlines and Lufthansa can get you from St. Louis to Bulgaria in just under 19h 50m. Your travel time can differ by up to 7h 30m. Airlines will cover a distance of 5444 mi. This flight may include one or multiple stops.

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

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

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

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

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

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

See more FAQs

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Alternative routes for St. Louis to Bulgaria

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from St. Louis to Bulgaria

Discover the top 2 airlines that operate flights from St. Louis to Bulgaria. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$560Average$847FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$614Average$889FlexibilityNo cancel feeOn-time76%

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