$520 Find Cheap Flights from St. Louis to Bulgaria

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Bulgaria departing on 3/1. 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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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, Mar 1 - Wed, Mar 11
United Airlines Logo
6:55 pm - 6:20 pm
STL
-
SOF
15h 25m
2 stops
United Airlines Logo
6:10 am - 2:55 pm
SOF
-
STL
15h 45m
1 stop
$520United Airlines
Mon, Mar 2 - Sun, Mar 8
Lufthansa Logo
6:55 pm - 10:45 pm
STL
-
SOF
19h 50m
2 stops
Lufthansa Logo
6:10 am - 1:55 pm
SOF
-
STL
15h 45m
1 stop
$526Lufthansa
Sun, Mar 1 - Wed, Mar 11
United Airlines Logo
3:50 pm - 6:00 pm
STL
-
SOF
18h 10m
1 stop
United Airlines Logo
6:10 am - 2:55 pm
SOF
-
STL
15h 45m
1 stop
$527United Airlines
Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
9:55 am - 1:15 pm
STL
-
SOF
19h 20m
2 stops
United Airlines Logo
2:15 pm - 3:29 pm
SOF
-
STL
32h 14m
2 stops
$528United Airlines
Sun, Mar 1 - Wed, Mar 11
United Airlines Logo
6:00 pm - 6:20 pm
STL
-
SOF
16h 20m
2 stops
United Airlines Logo
6:10 am - 10:59 pm
SOF
-
STL
23h 49m
2 stops
$530United Airlines
Sat, Feb 28 - Wed, Mar 11
British Airways Logo
11:50 am - 4:20 pm
STL
-
SOF
44h 30m
2 stops
British Airways Logo
9:00 pm - 11:48 pm
SOF
-
STL
33h 48m
2 stops
$533British Airways
Sun, Mar 1 - Sun, Mar 8
Lufthansa Logo
3:50 pm - 1:35 pm
STL
-
SOF
13h 45m
1 stop
Lufthansa Logo
6:10 am - 1:55 pm
SOF
-
STL
15h 45m
1 stop
$534Lufthansa
Wed, Mar 4 - Tue, Mar 10
United Airlines Logo
3:50 pm - 1:50 pm
STL
-
SOF
14h 00m
1 stop
United Airlines Logo
2:15 pm - 3:29 pm
SOF
-
STL
32h 14m
2 stops
$535United Airlines
Sun, Mar 1 - Sun, Mar 8
Lufthansa Logo
6:55 pm - 6:20 pm
STL
-
SOF
15h 25m
2 stops
Lufthansa Logo
6:05 am - 1:55 pm
SOF
-
STL
15h 50m
2 stops
$538Lufthansa
Sat, Feb 28 - Tue, Mar 10
United Airlines Logo
4:30 pm - 10:45 pm
STL
-
SOF
22h 15m
2 stops
United Airlines Logo
6:05 am - 8:41 pm
SOF
-
STL
21h 36m
2 stops
$540United Airlines
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$520
Most popular time to fly with an average 4% increase in price.
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 9175 reviews
6.6Food
7.7Boarding
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

8.0 ExcellentAnonymous, Jan 2026
BNA - EWR
Read more United Airlines reviews

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

The flight crew where really good. Better then the crew from BNE to SFO

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

Delayed, toilets did not flush, pilot parked to far away from Gate

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

left on time, reasonable boarding process arrived early luggage came out quickly

I like flying first class, and United has a nice one

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…

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

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

Information on your arrival and departure airports