$635 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 9/1. 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

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Best Bulgaria Flight Deals from St. Louis

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Sofia
Sofia2 stops$635
Sofia
Sofia2 stops$635

Cheap Flights from St. Louis to Bulgaria

 
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

Mon, Sep 1 - Wed, Sep 10
Lufthansa Logo
5:30 pm - 11:00 pmSTL-SOF
21h 30m2 stops
Lufthansa Logo
6:15 am - 1:30 pmSOF-STL
15h 15m1 stop
$635Lufthansa
Find Deal
Sun, Aug 31 - Tue, Sep 9
Air Canada Logo
4:00 pm - 12:00 pmSTL-SOF
36h 00m2 stops
Air Canada Logo
6:20 am - 7:57 pmSOF-STL
21h 37m2 stops
$638Air Canada
Find Deal
Tue, Sep 2 - Wed, Sep 10
Lufthansa Logo
5:30 pm - 10:50 pmSTL-SOF
21h 20m2 stops
Lufthansa Logo
6:15 am - 1:30 pmSOF-STL
15h 15m1 stop
$640Lufthansa
Find Deal
Tue, Sep 2 - Tue, Sep 9
Air Canada Logo
9:15 am - 11:15 amSTL-SOF
18h 00m2 stops
Air Canada Logo
6:20 am - 7:57 pmSOF-STL
21h 37m2 stops
$642Air Canada
Find Deal
Sun, Aug 31 - Wed, Sep 10
Air Canada Logo
4:00 pm - 12:00 pmSTL-SOF
36h 00m2 stops
Air Canada Logo
12:00 pm - 3:18 pmSOF-STL
35h 18m2 stops
$644Air Canada
Find Deal
Mon, Sep 1 - Tue, Sep 9
Lufthansa Logo
5:30 pm - 11:00 pmSTL-SOF
21h 30m2 stops
Lufthansa Logo
2:00 pm - 1:30 pmSOF-STL
31h 30m1 stop
$655Lufthansa
Find Deal
Tue, Sep 2 - Tue, Sep 9
Lufthansa Logo
5:30 pm - 10:50 pmSTL-SOF
21h 20m2 stops
Lufthansa Logo
12:00 pm - 1:30 pmSOF-STL
33h 30m1 stop
$659Lufthansa
Find Deal
Sat, Aug 30 - Tue, Sep 9
United Airlines Logo
6:35 am - 11:00 pmSTL-SOF
32h 25m2 stops
United Airlines Logo
6:00 am - 3:44 pmSOF-STL
17h 44m2 stops
$821United Airlines
Find Deal
Sat, Aug 30 - Wed, Sep 10
United Airlines Logo
6:35 am - 11:00 pmSTL-SOF
32h 25m2 stops
United Airlines Logo
12:45 pm - 2:19 pmSOF-STL
33h 34m2 stops
$827United Airlines
Find Deal
Mon, Sep 1 - Sat, Sep 6
Turkish Airlines Logo
5:30 pm - 8:35 amSTL-SOF
31h 05m2 stops
Turkish Airlines Logo
3:35 pm - 2:19 pmSOF-STL
30h 44m2 stops
$1,457Turkish Airlines
Find Deal
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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 December, when the average cost of round-trip tickets is $1,434 and $1,307 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 5 weeks before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.


Good to know

Low seasonJanuary
High seasonJuly
Cheapest flight$635
Best time to beat the crowds with an average 28% 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 8846 reviews
8.1Crew
6.6Food
7.3Comfort
7.7Boarding
7.0Entertainment
Airline reviews

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

4.0 OkayJeanette, Jul 2025IAD - TPA
Read more United Airlines reviews

I liked the choice of lemon ginger tea. I think stewardesses can be more considerate of older people needs.

The food should improve! And The flight should leave on time and not make the traveler wait.

It was great, I’m very grateful for the pilots and crew flight attendants for everything.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

A little bit more leg room in premium economy. I am 6’4”.

Overall it was good. I missed my connection but I was put on another flight.

The attendant were friendly. I suggest you have a medical attendant on board every flight so that in case someone is sick , he/she will help them.

The woman gate agent in Phoenix was none too sympathetic about my check-in process as I am relatively new with using apps. I almost did not get on because she said I did not check-in. I thought I had via Kayak where I purchased a very expensive ticket. Lesson learned but to be told I may not get on as a matter of factly was difficult to hear.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

We love united ! We would like to acknowledge Aimee in the lounge near gate 130

We were charged for luggage, and our ticket was with Lufthansa and was supposed to include luggage fees. So our experience was a bit bad. Also, the flight was about 45 minutes late arriving.

Flight was great only departure was delayed to saome ground crew issues

It was freezing. I asked crew member for a blanket and was told it might be in front of plane but I never got one. I turned off all the vents but still froze.

Cheapest airlines I have ever been on. I got downgraded and never got on united. I got rerouted through Vancouver onto jetwesf

Flight was 1.5 hours late to depart so changed flights to Swiss Air.

The United Airlines crew that operated this flight was subpar. They didn’t

Very small and uncomfortable seats, Hard to hear entertainment system sound. Horrible food. Staff doesn't care much about the passengers. 2nd time they didn't give me my vegetarian meal. They asked me regular food with meat. The airline and staff was from United airlines.

Checkin took along timen only.few angents available at.checkin desk. Customer support over phone no existence

At baggage claim, I was given the wrong printed ticket. The ticket belonged to another passenger for a different flight — to Zurich instead of Frankfurt (layover). I was even allowed to pass security, and when I asked the Lufthansa employee if I was on the correct flight, and why it was changed. The employee said everything was correct and I should board. When I got on the plane, there was someone in my seat, and the crew on the plane finally realized that I was on the wrong plane. When I got off the plane, nobody was willing to help, and the security refused to provide my original printed ticket. That was until I showed them that I took a photo of the ticket; once they realized I had photographic evidence, they were suddenly ready to help me. The Lufthansa employee began communicating with other airlines and found a flight that would take me to my destination via Polish Airlines. I was required to once again go through security, re-check my bag, and once again pay for my checked bag and weight overage fees. This experience was incredibly stressful and very frustrating, as you can imagine. A Lufthansa employee told me I would be eligible for a refund. Please tell me what steps I need to take in order to make that happen. Thank you!

The row of seats were so cramped it was difficult to get in and out of your seat. I even upgraded. A long flight and sad accommodations 😵‍💫 the shorter flight was very comfortable and the seating was spacious

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

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