$334 Find Cheap Flights from St. Louis to Bulgaria

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Bulgaria departing on 5/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Book Cheap St. Louis to Bulgaria Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Bulgaria that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Bulgaria

Sun, Jan 11 - Tue, Jan 27
Lufthansa Logo
3:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
2:00 pm - 11:59 pmSOF-STL
17h 59m2 stops
$461Lufthansa
Find Deal
Wed, Mar 18 - Wed, Apr 1
Lufthansa Logo
4:50 pm - 1:50 pmSTL-SOF
14h 00m1 stop
Lufthansa Logo
6:20 am - 1:30 pmSOF-STL
15h 10m1 stop
$500Lufthansa
Find Deal
Wed, Mar 18 - Wed, Apr 1
United Airlines Logo
5:55 pm - 6:20 pmSTL-SOF
17h 25m2 stops
United Airlines Logo
6:20 am - 1:30 pmSOF-STL
15h 10m1 stop
$504United Airlines
Find Deal
Sun, Jan 11 - Tue, Jan 27
Lufthansa Logo
1:15 pm - 10:45 pmSTL-SOF
25h 30m2 stops
Lufthansa Logo
6:00 am - 10:58 pmSOF-STL
24h 58m2 stops
$508Lufthansa
Find Deal
Wed, Mar 18 - Wed, Apr 1
Lufthansa Logo
11:28 am - 1:50 pmSTL-SOF
19h 22m2 stops
Lufthansa Logo
2:00 pm - 10:59 pmSOF-STL
16h 59m2 stops
$510Lufthansa
Find Deal
Wed, Jan 28 - Sun, Feb 1
Lufthansa Logo
11:22 am - 6:20 pmSTL-SOF
22h 58m2 stops
Lufthansa Logo
6:10 am - 10:58 pmSOF-STL
24h 48m2 stops
$528Lufthansa
Find Deal
Sun, Jan 11 - Tue, Jan 27
Lufthansa Logo
3:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
2:15 pm - 1:55 pmSOF-STL
31h 40m1 stop
$531Lufthansa
Find Deal
Wed, Jan 28 - Sun, Feb 1
Lufthansa Logo
3:50 pm - 1:50 pmSTL-SOF
14h 00m1 stop
Lufthansa Logo
6:10 am - 10:58 pmSOF-STL
24h 48m2 stops
$535Lufthansa
Find Deal
Sun, Jan 11 - Tue, Jan 27
Multiple Airlines Logo
9:57 am - 6:20 pmSTL-SOF
24h 23m3 stops
Multiple Airlines Logo
2:15 pm - 3:29 pmSOF-STL
33h 14m2 stops
$829Multiple Airlines
Find Deal
Wed, Mar 18 - Wed, Apr 1
Air Canada Logo
11:25 am - 1:50 pmSTL-SOF
19h 25m3 stops
Air Canada Logo
6:20 am - 3:24 pmSOF-STL
17h 04m2 stops
$1,015Air Canada
Find Deal
Booking Insights

KAYAK's insights & trends for St. Louis to Bulgaria flights

Get data-powered insights and trends into flights from St. Louis to Bulgaria to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Bulgaria?

The average price of all round-trip flights from St. Louis to Bulgaria clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from St. Louis to Bulgaria, look for departures on Saturdays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from Bulgaria, Wednesday is the cheapest day to fly and Tuesday is the most expensive.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Bulgaria, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Bulgaria, you should book around 3 weeks before departure, which saves you about 16% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$334
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from St. Louis to Sofia

FAQs - booking Bulgaria flights

  • How does KAYAK find such low prices on flights from St. Louis to Bulgaria?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Bulgaria.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Bulgaria?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to Bulgaria is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Bulgaria?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from St. Louis to Bulgaria with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Bulgaria?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from St. Louis to Bulgaria up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Bulgaria?

    The cheapest time of day to fly to Bulgaria is generally in the morning, when round-trip flights cost $1,199 on average. Morning departures are around 10% cheaper than evening flights, on average. The most expensive time of day to fly to Bulgaria is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,335.

Reviews of the top airlines flying from St. Louis to Bulgaria

 
Need help choosing which airline to fly with from St. Louis to Bulgaria? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9063 reviews
7.1Entertainment
7.3Comfort
7.7Boarding
8.1Crew
6.6Food
Airline reviews

The movies offered were great. Staff were very pleasant and very efficient.

10.0 ExcellentAnonymous, Dec 2025ORD - HND
Read more United Airlines reviews

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Flight and crew were great. United didn't inform crew of immigration process which was disappointing!

Flight team stood out for perzonal attention, kindness at bright cheery attitudes at 8am. Very helpful.

Seats had less pitch than a regional jet. Food was OK. Have to buy alcohol on US based carriers flying international. Boarding was a mess. Did not have bags but overhead space was gone quick. Would like to see the airlines enforce the one bag over and one bag under policy

Ot was overall fine. Left on time and had basic snacks. Weather was finicky but that’s not the airlines fault.

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

Ground staff and cabin crew were excellent. Flight was perfectly on time. Zero issues.

Even after a delay, getting off the ground, thanks for keeping me safe, the airline made certain that my connecting flight was rebooked to get me to my final destination. It was actually rebooked twice, and my luggage still managed to meet me. The airline gave me a credit for food and beverage to be used at the airport vendors, regretfully, the credit did not transfer to my final boarding pass. Oh, well…

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

We didn't get the coffee with breakfast in the morning.. 30 mins lazer I asked flight attendant why don't we get coffee now at least.. after the breakfast..she said that captain announced possible turbulences fee minutes ago, which didn't ecplain why we didn't get it with the breakfast..breakfast was very poor btw..just little pastry which you can eat in 4 little bites. Turbulences fortunately didn't even happen.. but we didn't get that more than necessary coffee in the morning after the night flight with very poor sleep.. They just served breakfast 1 hour afzer we took off..at like 11 PM.. that doesn't make sense at all.. Also, flight attendants weren't very nice..they looked like they're not happy with their job.. :/

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

Everything you need to know for your flight from St. Louis to Bulgaria

Information on your arrival and departure airports