$550 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 10/26. 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

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Cheap Flights from St. Louis to Bulgaria

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Sofia
Sofia2 stops$550
Sofia
Sofia2 stops$550

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, Oct 26 - Tue, Nov 11
Air Canada Logo
4:05 pm - 6:20 pmSTL-SOF
19h 15m2 stops
Air Canada Logo
2:15 pm - 3:29 pmSOF-STL
33h 14m2 stops
$550Air Canada
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Sun, Oct 26 - Tue, Nov 11
 Logo
4:50 pm - 6:00 pmSTL-SOF
18h 10m1 stop
 Logo
6:00 am - 3:29 pmSOF-STL
41h 29m2 stops
Wed, Oct 15 - Fri, Nov 14
Lufthansa Logo
12:25 pm - 12:00 pmSTL-SOF
15h 35m2 stops
Lufthansa Logo
6:10 am - 1:55 pmSOF-STL
15h 45m1 stop
$569Lufthansa
Find Deal
Wed, Oct 15 - Fri, Nov 14
Lufthansa Logo
12:25 pm - 12:00 pmSTL-SOF
15h 35m2 stops
Lufthansa Logo
6:10 am - 9:40 pmSOF-STL
23h 30m2 stops
$579Lufthansa
Find Deal
Sun, Oct 26 - Tue, Nov 11
Lufthansa Logo
4:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
2:15 pm - 1:55 pmSOF-STL
31h 40m1 stop
$584Lufthansa
Find Deal
Wed, Oct 15 - Fri, Nov 14
Lufthansa Logo
3:30 pm - 1:15 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
6:10 am - 1:55 pmSOF-STL
15h 45m1 stop
$620Lufthansa
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Wed, Sep 24 - Wed, Jan 7
United Airlines Logo
8:20 am - 11:00 pmSTL-SOF
30h 40m2 stops
United Airlines Logo
7:55 am - 10:58 pmSOF-STL
23h 03m2 stops
$686United Airlines
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Wed, Sep 24 - Wed, Jan 7
Lufthansa Logo
3:30 pm - 5:50 pmSTL-SOF
18h 20m1 stop
Lufthansa Logo
6:10 am - 1:55 pmSOF-STL
15h 45m1 stop
$741Lufthansa
Find Deal
Wed, Sep 24 - Wed, Jan 7
 Logo
3:30 pm - 5:50 pmSTL-SOF
18h 20m1 stop
 Logo
7:55 am - 10:58 pmSOF-STL
23h 03m2 stops
Wed, Oct 15 - Fri, Nov 14
Air Canada Logo
1:30 pm - 1:15 pmSTL-SOF
15h 45m2 stops
Air Canada Logo
6:10 am - 9:40 pmSOF-STL
23h 30m3 stops
$937Air Canada
Find Deal
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.

What is the cheapest month to fly from St. Louis to Bulgaria?

To calculate monthly average prices, KAYAK takes all prices for each month 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 median of all values for each month.

The cheapest month for flights from St. Louis to Bulgaria is February, when tickets cost $640 (return) on average. On the other hand, the most expensive months are June and October, when the average cost of round-trip tickets is $1,456 and $1,319 respectively.

What’s the cheapest day of the week to fly from St. Louis to Bulgaria?

The average price of all round-trip flights from St. Louis to Bulgaria clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from St. Louis to Bulgaria, look for departures on Saturdays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from Bulgaria, Wednesday is the cheapest day to fly and Tuesday is the most expensive.

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 35% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$550
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 6% 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.

  • What is the cheapest time of day to fly to Bulgaria?

    The cheapest time of day to fly to Bulgaria is generally in the morning, when round-trip flights cost $1,199 on average. Morning departures are around 10% cheaper than evening flights, on average. The most expensive time of day to fly to Bulgaria is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,335.

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 8937 reviews
7.3Comfort
7.7Boarding
8.1Crew
6.6Food
7.1Entertainment
Airline reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

2.0 MediocreAnonymous, Sep 2025SFO - MEX
Read more United Airlines reviews

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

I liked Quiet people around me. Crew could have helped people with overhead luggage so they aren't moving other peoples bags around and causing problems for people that had there bags there first

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

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

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