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Cheap flights from St. Louis to Bulgaria from $652

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Bulgaria departing on 3/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Bulgaria

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
4:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
United Airlines Logo
6:10 am - 10:06 pmSOF-STL
23h 56m2 stops
$652United Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
4:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
6:10 am - 7:48 pmSOF-STL
21h 38m2 stops
$653Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
4:50 pm - 10:45 pmSTL-SOF
22h 55m1 stop
Lufthansa Logo
2:00 pm - 1:30 pmSOF-STL
31h 30m1 stop
$663Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
4:50 pm - 6:20 pmSTL-SOF
18h 30m2 stops
Lufthansa Logo
6:10 am - 7:48 pmSOF-STL
21h 38m2 stops
$676Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31

United Airlines flights from St. Louis to Bulgaria

Our best United Airlines deals on St. Louis to Bulgaria flight tickets
United Airlines
Mar 27
STL4:50 pmLambert-St Louis
13h 45m
1 stop
SOF1:35 pmSofia
Mar 31
SOF6:10 amSofia
23h 56m
2 stops
STL10:06 pmLambert-St Louis
$652
Find similar
United Airlines
Nov 3
STL1:10 pmLambert-St Louis
16h 05m
2 stops
SOF1:15 pmSofia
Nov 18
SOF6:00 amSofia
16h 24m
2 stops
STL2:24 pmLambert-St Louis
$767
Find similar
United Airlines
Nov 3
STL1:35 pmLambert-St Louis
20h 45m
2 stops
SOF6:20 pmSofia
Nov 12
SOF2:00 pmSofia
17h 56m
2 stops
STL11:56 pmLambert-St Louis
$769
Find similar

Lufthansa flights from St. Louis to Bulgaria

Our best Lufthansa deals on St. Louis to Bulgaria flight tickets
Lufthansa
Mar 27
STL4:50 pmLambert-St Louis
13h 45m
1 stop
SOF1:35 pmSofia
Mar 31
SOF6:10 amSofia
21h 38m
2 stops
STL7:48 pmLambert-St Louis
$653
Find similar
Lufthansa
Mar 27
STL4:50 pmLambert-St Louis
22h 55m
1 stop
SOF10:45 pmSofia
Mar 31
SOF2:00 pmSofia
31h 30m
1 stop
STL1:30 pmLambert-St Louis
$663
Find similar
Lufthansa
Mar 27
STL4:50 pmLambert-St Louis
18h 30m
2 stops
SOF6:20 pmSofia
Mar 31
SOF6:10 amSofia
21h 38m
2 stops
STL7:48 pmLambert-St Louis
$676
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 2, 2025.
Use the filters below to find and compare flights from St. Louis to Bulgaria that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 3/31

6:10 am-10:06 pm

2 stops23h 56m

$652

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 3/31

6:10 am-7:48 pm

2 stops21h 38m

$653

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-10:45 pm

1 stop22h 55m

Sofia

Tue 3/31

2:00 pm-1:30 pm

1 stop31h 30m

$663

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-6:20 pm

2 stops18h 30m

Sofia

Tue 3/31

6:10 am-7:48 pm

2 stops21h 38m

$676

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from St. Louis to Bulgaria

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Bulgaria?

The cheapest day to depart from St. Louis to Bulgaria is on a Saturday when prices can be found for as low as $1,095. On the other hand, Friday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,306.

What is the cheapest time of day to depart on your flight to Bulgaria?

In the morning is the cheapest time of day to fly from St. Louis to Bulgaria when you can find flight prices for as low as $1,199. Flying to Bulgaria in the morning is an ideal time because this is during off-peak travel hours. Flights to Bulgaria are more costly in the afternoon, with an average ticket price of $1,335. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Bulgaria?

You are more likely to see cheaper flights to Bulgaria from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Bulgaria for around $946 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Bulgaria from St. Louis for as low as $799 on momondo.

Can stopping save me money on St. Louis to Bulgaria flights?

You could potentially save up to 11% on your flight if you consider stops on a St. Louis to Bulgaria flight.

Cheap St. Louis to Bulgaria flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Bulgaria

Direct flights

None
There are no direct flights from St. Louis to Bulgaria. There are no popular flight routes from St. Louis to Bulgaria.
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  • When did momondo last update prices for flights from Lambert-St Louis Airport to Bulgaria?

    Prices for flights from Lambert-St Louis Airport to Bulgaria are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Bulgaria?

  • How old do you have to be to fly from Lambert-St Louis Airport to Bulgaria?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Bulgaria.

  • What documentation or ID do you need to fly to Bulgaria?

    The travel and health documents required for your trip to Bulgaria can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Bulgaria. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from St. Louis to Bulgaria

Compare and see reviews for airlines that fly from St. Louis to Bulgaria with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $669Free CancellationRating
6.8
7,544 reviews
Search Lufthansa flights
United AirlinesPriceFrom $711Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Bulgaria?

Finding the right flight to Bulgaria from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Bulgaria quick and easy, saving you time and money.

Can I find flights from St. Louis to Bulgaria with flexible booking policies on momondo?

momondo does allow users to show only those flights to Bulgaria from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Bulgaria?

momondo helps you find the best flight between St. Louis and Bulgaria by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from St. Louis to Bulgaria right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Bulgaria flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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