$537 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 2/20. 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

Fri, Feb 20 - Fri, Feb 27
Multiple Airlines Logo
10:14 am - 1:55 pm
STL
-
SOF
19h 41m2 stops
Multiple Airlines Logo
7:00 am - 11:36 pm
SOF
-
STL
24h 36m2 stops
$537Multiple Airlines
Thu, Jan 29 - Mon, Feb 2
British Airways Logo
3:37 pm - 11:15 am
STL
-
SOF
35h 38m2 stops
British Airways Logo
5:25 pm - 8:13 pm
SOF
-
STL
34h 48m2 stops
$658British Airways
Thu, Jan 29 - Mon, Feb 2
United Airlines Logo
8:05 am - 10:45 pm
STL
-
SOF
30h 40m2 stops
United Airlines Logo
6:10 am - 10:00 pm
SOF
-
STL
23h 50m2 stops
$747United Airlines
Sun, Jul 5 - Wed, Jul 15
Multiple Airlines Logo
12:10 pm - 11:00 am
STL
-
SOF
14h 50m2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m1 stop
$796Multiple Airlines
Sun, Jul 5 - Wed, Jul 15
Lufthansa Logo
3:30 pm - 6:10 pm
STL
-
SOF
18h 40m1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m1 stop
$814Lufthansa
Sun, Jul 5 - Wed, Jul 15
Multiple Airlines Logo
12:10 pm - 11:00 am
STL
-
SOF
14h 50m2 stops
Multiple Airlines Logo
6:10 am - 1:25 pm
SOF
-
STL
15h 15m2 stops
$821Multiple Airlines
Fri, Feb 20 - Fri, Feb 27
Multiple Airlines Logo
4:05 pm - 10:45 pm
STL
-
SOF
22h 40m2 stops
Multiple Airlines Logo
6:10 am - 5:45 pm
SOF
-
STL
19h 35m3 stops
$843Multiple Airlines
Fri, Feb 20 - Fri, Feb 27
Air Canada Logo
9:55 am - 1:35 pm
STL
-
SOF
19h 40m3 stops
Air Canada Logo
6:10 am - 5:45 pm
SOF
-
STL
19h 35m3 stops
$1,282Air Canada
Sun, Jul 5 - Wed, Jul 15
United Airlines Logo
6:30 am - 11:00 am
STL
-
SOF
20h 30m3 stops
United Airlines Logo
6:10 am - 4:26 pm
SOF
-
STL
18h 16m2 stops
$1,482United Airlines
Sun, Jul 5 - Wed, Jul 15
Multiple Airlines Logo
1:11 pm - 11:00 pm
STL
-
SOF
25h 49m3 stops
Multiple Airlines Logo
3:20 pm - 6:27 pm
SOF
-
STL
35h 07m3 stops
$2,029Multiple 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$537
Most popular time to fly with an average 5% 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 9138 reviews
6.6Food
7.3Comfort
8.1Crew
7.7Boarding
7.1Entertainment
Airline reviews

It was great with United overall except for two things. 1) It was a 5-hour flight and we were with kids, so we were asking for extra snacks. They were extremely reticent to dole them out even though there wasn't any meal and the kids were starting to hit their limit towards the end. 2) Baggage didn't arrive until 80 minutes after we landed.

6.0 GoodTobin, Jan 2026
LAX - CUN
Read more United Airlines reviews

It was great with United overall except for two things. 1) It was a 5-hour flight and we were with kids, so we were asking for extra snacks. They were extremely reticent to dole them out even though there wasn't any meal and the kids were starting to hit their limit towards the end. 2) Baggage didn't arrive until 80 minutes after we landed.

They lost my luggage, so, not happy. The crew was nice but my suitcases never made it, still trying to find out what happened!

The staff was hospitable and professional. The seat had a bit of wear. The winner shade was stuck 1/4 open. I received the best of both worlds. The morning sun was able to come in and blind the screen i was trying to use while at the same time it was too low to look out and enjoy the view. Rather embarrassing for a 1st class ticket.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

Aircraft was noisy, old and never dimmed the lights on a night flight even on business class! I flew 17 times on United and probably another 40 on other airlines United USA /Europe flights were the worst to include luggage delayed once going to europe and once coming back

Check how old the airframe is, some older ones have inoperable seat back entertainment or power.

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

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!

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

Information on your arrival and departure airports