$375 Find Cheap Flights from St. Louis to Bulgaria

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Bulgaria departing on 12/31. 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

Mon, Dec 8 - Mon, Dec 15
Lufthansa Logo
6:42 pm - 10:45 pmSTL-SOF
20h 03m2 stops
Lufthansa Logo
1:45 pm - 11:42 pmSOF-STL
17h 57m2 stops
$516Lufthansa
Find Deal
Fri, Jan 23 - Sun, Feb 1
Lufthansa Logo
3:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
6:10 am - 11:59 pmSOF-STL
25h 49m2 stops
$542Lufthansa
Find Deal
Sat, Dec 6 - Sat, Dec 13
Multiple Airlines Logo
1:00 pm - 1:55 pmSTL-SOF
16h 55m2 stops
Multiple Airlines Logo
7:00 am - 5:29 pmSOF-STL
18h 29m2 stops
$543Multiple Airlines
Find Deal
Fri, Jan 23 - Sun, Feb 1
United Airlines Logo
11:20 am - 1:15 pmSTL-SOF
17h 55m2 stops
United Airlines Logo
2:00 pm - 11:59 pmSOF-STL
17h 59m2 stops
$546United Airlines
Find Deal
Fri, Jan 23 - Sun, Feb 1
United Airlines Logo
3:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
United Airlines Logo
6:10 am - 10:00 pmSOF-STL
23h 50m2 stops
$551United Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 13
British Airways Logo
10:47 am - 1:00 pmSTL-SOF
18h 13m2 stops
British Airways Logo
12:05 pm - 11:38 pmSOF-STL
43h 33m2 stops
$568British Airways
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Sun, Nov 30 - Sun, Dec 14
Multiple Airlines Logo
2:36 pm - 1:55 pmSTL-SOF
15h 19m2 stops
Multiple Airlines Logo
7:00 am - 8:47 pmSOF-STL
21h 47m2 stops
$718Multiple Airlines
Find Deal
Sun, Nov 30 - Sun, Dec 14
British Airways Logo
6:00 am - 4:20 pmSTL-SOF
26h 20m2 stops
British Airways Logo
2:30 pm - 8:38 pmSOF-STL
38h 08m2 stops
$779British Airways
Find Deal
Wed, Nov 26 - Wed, Dec 10
Air Canada Logo
4:05 pm - 6:00 pmSTL-SOF
17h 55m2 stops
Air Canada Logo
6:10 am - 9:40 pmSOF-STL
23h 30m3 stops
$977Air Canada
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Mon, Dec 8 - Mon, Dec 15
Air Canada Logo
11:25 am - 6:20 pmSTL-SOF
22h 55m3 stops
Air Canada Logo
6:10 am - 9:40 pmSOF-STL
23h 30m3 stops
$1,069Air 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’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 16% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$478
Best time to beat the crowds with an average 32% drop in price.
Most popular time to fly and prices are also 2% 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 9012 reviews
8.1Crew
7.1Entertainment
7.3Comfort
7.7Boarding
6.6Food
Airline reviews

Older aircraft, no meal, only food was for purchase. Not impressed United.

4.0 OkayThomas, Nov 2025SFO - KOA
Read more United Airlines reviews

Older aircraft, no meal, only food was for purchase. Not impressed United.

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Always wish for more healthy, gluten free options. We have to bring our own.

Having a long layover, I was very appreciative of the ability to stand by for an earlier flight. Other airlines like Delta have refused this to me in the past, just to be mean (because my ticket class wasn't high enough). United went out of their way to help me get to my destination early, which I really appreciated given that it was the third leg of a 24+ hour journey for me.

Other than a way way too cold cabinets for the entire flight, all was great

One bag is incorrect and not acceptable for an international flight. The food was not just good. I won't fly with them again.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

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!

We didn't get the coffee with breakfast in the morning.. 30 mins lazer I asked flight attendant why don't we get coffee now at least.. after the breakfast..she said that captain announced possible turbulences fee minutes ago, which didn't ecplain why we didn't get it with the breakfast..breakfast was very poor btw..just little pastry which you can eat in 4 little bites. Turbulences fortunately didn't even happen.. but we didn't get that more than necessary coffee in the morning after the night flight with very poor sleep.. They just served breakfast 1 hour afzer we took off..at like 11 PM.. that doesn't make sense at all.. Also, flight attendants weren't very nice..they looked like they're not happy with their job.. :/

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

I think they overbooked Frankfurt to New York and bumped me off. This changed my return travel I arrived home about 4 hours late. Almost 24 total travel time Totally unacceptable Would not travel with United

We were moved twice on flights to the point we weren’t even on Lufthansa anymore. We had to fly united. Lost paid extra leg room twice. To top it all off we’re forced to pay $375 and $275, respectively for you luggage that was considered sports luggage. We were told it would be Lufthansa fares l, from the united desk, AND WE DIDN'T EVEN HAVE A LUFTHANSA FLIGHT! I’ll be calling once my trip is over on October 7th to all airlines and Kayak. This was ridiculous!

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

Information on your arrival and departure airports