$837 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 9/9. 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

Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
9:00 am - 11:15 pm
STL
-
SOF
30h 15m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$837United Airlines
Mon, Jul 27 - Mon, Aug 31
Multiple Airlines Logo
8:55 am - 12:10 pm
STL
-
SOF
19h 15m
2 stops
Multiple Airlines Logo
11:50 am - 1:25 pm
SOF
-
STL
33h 35m
1 stop
$839Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
9:00 am - 11:15 pm
STL
-
SOF
30h 15m
2 stops
United Airlines Logo
6:20 am - 5:49 pm
SOF
-
STL
19h 29m
2 stops
$847United Airlines
Wed, Jul 22 - Wed, Aug 26
United Airlines Logo
11:10 am - 6:40 pm
STL
-
SOF
23h 30m
2 stops
United Airlines Logo
6:10 am - 11:50 pm
SOF
-
STL
25h 40m
2 stops
$848United Airlines
Mon, Jul 27 - Mon, Aug 31
Multiple Airlines Logo
12:10 pm - 10:55 am
STL
-
SOF
14h 45m
2 stops
Multiple Airlines Logo
7:25 pm - 1:25 pm
SOF
-
STL
26h 00m
2 stops
$851Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
12:10 pm - 6:05 pm
STL
-
SOF
21h 55m
2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$873Multiple Airlines
Wed, Sep 2 - Wed, Sep 23
Multiple Airlines Logo
8:55 am - 6:05 pm
STL
-
SOF
25h 10m
2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$878Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
British Airways Logo
9:46 am - 1:25 pm
STL
-
SOF
43h 39m
2 stops
British Airways Logo
9:25 pm - 11:38 pm
SOF
-
STL
34h 13m
2 stops
$879British Airways
Wed, Sep 9 - Wed, Sep 16
British Airways Logo
9:46 am - 1:25 pm
STL
-
SOF
43h 39m
2 stops
British Airways Logo
9:25 pm - 11:38 pm
SOF
-
STL
34h 13m
2 stops
$880British Airways
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
12:30 pm - 12:10 pm
STL
-
SOF
15h 40m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$887United 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 16 weeks before departure.

Good to know

Cheapest flight$837
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 3 airlines serving 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 9562 reviews
7.7Boarding
7.3Comfort
8.1Crew
6.6Food
7.1Entertainment
Airline reviews

Poor communication, flight was delayed for preventable reasons. I missed my connection.

2.0 MediocreAaron, Apr 2026
ORD - BNA
Read more United Airlines reviews

Poor communication, flight was delayed for preventable reasons. I missed my connection.

It was better than excellent. The staff in Mason City were great. The young woman that pushed my wheelchair did more than could be expected of her. She came from India 17 years ago. I don't remember her name.

After arriving in Chicago, we were taxiing for 1.5 hours with infrequent and untruthful updates about the amount of time it would take to arrive at the gate. Minimally, the team could have provided timing expectations that were more truthful, especially one their original expectations were not met.

All good flight was 35 minutes early when arriving in Edinburgh

Flights were on time actually early service was good and crew cheerful

Every staff member was professional, friendly and courteous. The pizza twist was ok. It was warm but too much dough.

The boarding timing needs to be improved. The flight was delayed again because it took way too long to board. I was already exhausted from sleeping at the airport and spending all day there due to delay from my previous flight that connected in Chicago.

I had a terrible experience. My flight got delayed from Atlanta to Chicago on Monday April 6, 2026, and that led to me missing my next flight to Brussels. United Airlines didn’t provide me with any accommodation for shelter. I had to sleep at the airport in Chicago. The next flight I was put on didn’t leave until the evening hours of Tuesday 4/7/2026.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Flight home was delayed multiple times, did not get home until 2am

the check-in lady at ORD was extremely rude and unprofessional. very disappointed as it was supposed to be a celebration for my wife's birthday and it really put a damper on things. if i wanted to be treated like trash, i would have flown Economy! (as opposed to business class)

My original flight was cancelled and then rebooked four hours later on a recovery flight, but I was checked in as stanby and had no seats so as a family of four we were concerned about not being seated altogether. Our flight then got delayed by another 1.5 hours and when seats were assigned at the gate, three of the four of us were together and we could get my wife closer, they offered no assistance.

I bought a ticket from Kayak. When I got to the airport, the was no ticket. I had to pay 5X to get to my destination. No response received from Kayak. I will NEVER use them again.

My wallet was stolen while I was sleeping on the plane.

Good boarding but extremely cold temperature in both flights (60 F!).

The whole plane smelled and felt old. The seats were very uncomfortable. Multiple delays. Extra fees.

Very rude gate attendants in San Francisco who didn’t let me bring my little carry on (smaller than usual size) and after boarding I realized that there still were a lot of overhead compartment space (like a full section available in some spots). That made me lose 30 minutes at my destination at 1am and it could have broken something fragile that I had in it

The most uncomfortable flight I’ve ever been on. I’m only 5,4” and barely had enough room to exist, couldn’t even fully relax my shoulders. Not sure why they bother with snacks. Half a coke and a single cookie?? Wow. Purchasable food looked gross too. Remember when airlines used to treat you like a human being?

Departed Palm Springs over an hour late because there’s only one gate, and it has always delayed by the arriving and departing flight to Toronto and the arriving flight from Vancouver.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

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

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

Information on your arrival and departure airports