$727 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 5/5. 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

Tue, May 5 - Tue, May 12
Air Canada Logo
2:15 pm - 6:40 pm
STL
-
SOF
20h 25m
2 stops
Air Canada Logo
6:10 am - 8:25 pm
SOF
-
STL
22h 15m
2 stops
$727Air Canada
Wed, May 6 - Wed, May 13
United Airlines Logo
5:59 pm - 6:40 pm
STL
-
SOF
16h 41m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$753United Airlines
Wed, Apr 29 - Tue, May 5
United Airlines Logo
11:37 am - 12:10 pm
STL
-
SOF
16h 33m
2 stops
United Airlines Logo
6:10 am - 8:25 pm
SOF
-
STL
22h 15m
2 stops
$756United Airlines
Wed, May 6 - Tue, Jan 12
Multiple Airlines Logo
12:23 pm - 2:00 pm
STL
-
SOF
17h 37m
2 stops
Multiple Airlines Logo
7:00 am - 8:37 pm
SOF
-
STL
21h 37m
2 stops
$761Multiple Airlines
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
2:15 pm - 6:40 pm
STL
-
SOF
20h 25m
2 stops
Multiple Airlines Logo
6:40 pm - 1:25 pm
SOF
-
STL
26h 45m
1 stop
$766Multiple Airlines
Wed, Apr 29 - Tue, May 5
United Airlines Logo
11:37 am - 12:10 pm
STL
-
SOF
16h 33m
2 stops
United Airlines Logo
2:10 pm - 1:25 pm
SOF
-
STL
31h 15m
1 stop
$773United Airlines
Wed, Apr 29 - Mon, May 4
United Airlines Logo
11:37 am - 12:10 pm
STL
-
SOF
16h 33m
2 stops
United Airlines Logo
2:20 pm - 4:39 pm
SOF
-
STL
34h 19m
2 stops
$783United Airlines
Wed, May 6 - Tue, Jan 12
Multiple Airlines Logo
2:15 pm - 6:05 pm
STL
-
SOF
19h 50m
2 stops
Multiple Airlines Logo
2:25 pm - 1:55 pm
SOF
-
STL
31h 30m
1 stop
$790Multiple Airlines
Wed, Apr 29 - Sun, May 3
United Airlines Logo
11:37 am - 12:10 pm
STL
-
SOF
16h 33m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$803United Airlines
Wed, Apr 29 - Sun, May 3
United Airlines Logo
11:37 am - 12:10 pm
STL
-
SOF
16h 33m
2 stops
United Airlines Logo
6:20 am - 8:25 pm
SOF
-
STL
22h 05m
2 stops
$806United 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 1 week before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Cheapest flight$727
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 9462 reviews
7.7Boarding
6.6Food
8.1Crew
7.3Comfort
7.1Entertainment
Airline reviews

No seat back entertainment. And app had a hard time getting entertainment loaded.

8.0 ExcellentStephanie, Mar 2026
DEN - CUN
Read more United Airlines reviews

No seat back entertainment. And app had a hard time getting entertainment loaded.

ticket agent lady wás very helpful , she arranged wheel chair for my elderly mother

Didn't make the flight because the first leg of my flight was canceled and the next leg was already booked.

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

Experience was great - no complaints. Took off on time, landed early. Got to the gate relatively quickly - took a little bit of extra time to deplane but nothing excessive.

Business class seats felt very cramped compared to other airlines.

Economy plus was so cramped I could not use my laptop. It was beyond bad.

OK, we were delayed and had to de plane and reboard.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Economy Priority seats are extremely uncomfortable. There is no way to escape the boxed in feeling, particularely because the distance between to rows are too short, the hard edge of the front row is keeping legs confined. There is no elevated place to put your feet. I am of average, European size.

Terrible. Both flights were significantly delayed, no luggage, made me check my small bag when many, many others had much larger carry-ons, not even a bottle of water . . . I will not fly Discover Airlines again.

I was deceived on the Kayak site expecting a ticket, but instead finding a "standby" reservation. When I tried to change the ticket, I paid almost twice the price of the original ticket. Then, the airline refused to give me the reserved seat I had chosen and paid for. I think I deserve a refund for this leg of my trip because I was doubly charged and did not receive what I had paid for. I put in a complaint with Lufthansa because the ticket was sold originally sold as a flight they listed. Someone here needs to take responsibility.

Excellent service; they helped me reschedule so I can fly in an earlier flight

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.

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

Information on your arrival and departure airports