$431 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 6/23. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Bulgaria

Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
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

Wed, Mar 18 - Fri, Apr 17
Multiple Airlines Logo
11:28 am - 11:50 am
STL
-
SOF
17h 22m
2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$517Multiple Airlines
Wed, Mar 18 - Fri, Apr 17
Multiple Airlines Logo
4:05 pm - 10:45 pm
STL
-
SOF
23h 40m
2 stops
Multiple Airlines Logo
6:20 am - 3:24 pm
SOF
-
STL
17h 04m
2 stops
$559Multiple Airlines
Wed, Mar 18 - Fri, Apr 17
Lufthansa Logo
4:50 pm - 6:00 pm
STL
-
SOF
18h 10m
1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$642Lufthansa
Sat, Mar 7 - Sat, Mar 14
Austrian Airlines Logo
6:25 am - 11:50 am
STL
-
SOF
21h 25m
2 stops
Austrian Airlines Logo
7:55 am - 9:05 pm
SOF
-
STL
20h 10m
2 stops
$700Austrian Airlines
Tue, May 5 - Sun, May 17
United Airlines Logo
7:30 am - 12:10 pm
STL
-
SOF
20h 40m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$704United Airlines
Tue, May 5 - Sun, May 17
Air Canada Logo
7:30 am - 12:10 pm
STL
-
SOF
20h 40m
2 stops
Air Canada Logo
6:10 am - 8:05 pm
SOF
-
STL
45h 55m
2 stops
$708Air Canada
Thu, Feb 26 - Mon, Mar 2
United Airlines Logo
9:55 am - 10:45 pm
STL
-
SOF
28h 50m
2 stops
United Airlines Logo
6:10 am - 10:59 pm
SOF
-
STL
24h 49m
2 stops
$747United Airlines
Fri, Mar 20 - Fri, Apr 17
Multiple Airlines Logo
4:05 pm - 10:15 am
STL
-
SOF
35h 10m
2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$749Multiple Airlines
Fri, Mar 20 - Fri, Apr 17
Multiple Airlines Logo
4:05 pm - 10:15 am
STL
-
SOF
35h 10m
2 stops
Multiple Airlines Logo
6:20 am - 3:24 pm
SOF
-
STL
17h 04m
2 stops
$757Multiple Airlines
Wed, Mar 18 - Fri, Apr 17
Air Canada Logo
11:25 am - 1:50 pm
STL
-
SOF
19h 25m
3 stops
Air Canada Logo
6:20 am - 3:24 pm
SOF
-
STL
17h 04m
2 stops
$762Air Canada
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.

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 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Cheapest flight$431
Most popular time to fly and prices are also 4% 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.

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 9259 reviews
7.1Entertainment
7.3Comfort
8.1Crew
7.7Boarding
6.6Food
Airline reviews

Terrible. Our first time back on United for 10 years, the seats in Polaris class are small and uncomfortable. They have squished too many people in to get more $$$. The staff are not friendly and not wanting to accommodate. I asked for two salads rather than a main meal and was advised no we wont do that. Then asked what I would like for breakfast and given something else anyway. I will not be flying United International anytime soon.

4.0 OkayVicky, Feb 2026
LAX - SYD
Read more United Airlines reviews

Terrible. Our first time back on United for 10 years, the seats in Polaris class are small and uncomfortable. They have squished too many people in to get more $$$. The staff are not friendly and not wanting to accommodate. I asked for two salads rather than a main meal and was advised no we wont do that. Then asked what I would like for breakfast and given something else anyway. I will not be flying United International anytime soon.

Same thing as flight from Pheonix to Newark. Uograded and Promised extra leg room and when I got to the seat it had none.

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

Everything except the food and entertainment. It was a great experience though

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

The attendant on board was amazing. She should be doing business/first international long haul.

Although our flight was delayed the overall boarding process was very smooth and the crew was accommodating.

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

I tried both on line and by calling the Customer Service line to arrange for a special meal as i have food intolerances. I was under the impression from your service representative that I was successful. I was not. I cannot eat spicy foods and get very ill if i eat bell peppers. I could not eat either menu choice and no special meal was actually ordered. ( your representative tried to order it for a flight that did not have meal service!!! - found this out later). Your wonderful cabin crew managed to put together a fruit, salad, roll and cheese tray for me so I had something to eat. WHY WOULD YOU SERVE SPICY FOOD, WITH NO MILDER OPTION,ON AN INTERNATIONAL FLIGHT???

Crew was professional and great, flight was clean. However food was pathetic. I ordered a Hindu meal assuming no meat but they served chicken. Need to be very specific- Hindu meal should be categorize as Vegetarian - no meat or egg. Or it should be specific that we are serving meat.

Late flight Delays Poor service Poor staff Worst airline ever

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…

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

Information on your arrival and departure airports