STL - SOF

$529 Find Cheap Flights from St. Louis to Sofia

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 Sofia departing on 1/27. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Sofia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Sofia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Sofia, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$529
Lufthansa
Tue 1/27Tue 2/3
STL - SOF • 2 stops
Cheapest one-way
Multiple Airlines
Wed 12/17
STL - SOF • multi-stop
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 17% compared to booking last minute.
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sofia!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Sofia (STL-SOF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Sofia 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 Sofia

Tue, Jan 27 - Tue, Feb 3
Lufthansa Logo
6:40 pm - 6:20 pm
STL
-
SOF
15h 40m2 stops
Lufthansa Logo
6:00 am - 7:27 pm
SOF
-
STL
21h 27m2 stops
$529Lufthansa
Mon, Jan 26 - Mon, Feb 2
Lufthansa Logo
1:15 pm - 1:15 pm
STL
-
SOF
16h 00m2 stops
Lufthansa Logo
1:45 pm - 11:59 pm
SOF
-
STL
18h 14m2 stops
$532Lufthansa
Sat, Jan 24 - Fri, Feb 6
United Airlines Logo
3:11 pm - 10:45 pm
STL
-
SOF
23h 34m2 stops
United Airlines Logo
6:10 am - 10:58 pm
SOF
-
STL
24h 48m2 stops
$545United Airlines
Fri, Jan 30 - Fri, Feb 6
Lufthansa Logo
6:40 pm - 6:20 pm
STL
-
SOF
15h 40m2 stops
Lufthansa Logo
6:10 am - 10:58 pm
SOF
-
STL
24h 48m2 stops
$546Lufthansa
Sat, Jan 24 - Sat, Jan 31
United Airlines Logo
1:15 pm - 6:20 pm
STL
-
SOF
21h 05m2 stops
United Airlines Logo
6:05 am - 11:59 pm
SOF
-
STL
25h 54m2 stops
$547United Airlines
Sun, Jan 25 - Wed, Feb 4
United Airlines Logo
3:50 pm - 10:45 pm
STL
-
SOF
22h 55m1 stop
United Airlines Logo
6:10 am - 3:29 pm
SOF
-
STL
41h 19m2 stops
$550United Airlines
Wed, Jan 28 - Mon, Feb 2
Lufthansa Logo
3:50 pm - 1:50 pm
STL
-
SOF
14h 00m1 stop
Lufthansa Logo
6:10 am - 10:58 pm
SOF
-
STL
24h 48m2 stops
$553Lufthansa
Tue, Jan 27 - Tue, Feb 3
Multiple Airlines Logo
8:05 am - 1:45 pm
STL
-
SOF
21h 40m3 stops
Multiple Airlines Logo
6:00 am - 3:15 pm
SOF
-
STL
41h 15m2 stops
$561Multiple Airlines
Sun, Jan 25 - Sat, Jan 31
Lufthansa Logo
6:40 pm - 6:20 pm
STL
-
SOF
15h 40m2 stops
Lufthansa Logo
7:05 pm - 10:58 pm
SOF
-
STL
35h 53m2 stops
$563Lufthansa
Sun, Jan 25 - Sat, Jan 31
United Airlines Logo
3:50 pm - 1:35 pm
STL
-
SOF
13h 45m1 stop
United Airlines Logo
2:25 pm - 2:30 pm
SOF
-
STL
32h 05m2 stops
$574United Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Sofia flights

Get data-powered insights and trends into flights from St. Louis to Sofia 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 Sofia?

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

If your flying dates are flexible, you should consider flying to Sofia on a Saturday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from St. Louis to Sofia. For your return ticket, we recommend flying on a Wednesday and avoiding Tuesdays for the best deals.

How far in advance should I book a flight from St. Louis to Sofia?

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 Sofia, 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 Sofia, you should book around 3 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Cheapest flight$529
Most popular time to fly with an average 3% increase in price.
Flight from St. Louis to Sofia

When to book flights from St. Louis to Sofia

Are your dates flexible? Find out the best times to travel from St. Louis to Sofia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Sofia

  • What is the cheapest flight from St. Louis to Sofia?

    In the last 3 days, the lowest price for a flight from St. Louis to Sofia was $529 for a round-trip ticket.

  • Do I need a passport to fly between St. Louis and Sofia?

    Yes, you'll most likely have to show a valid passport before boarding the plane in St. Louis and on arrival in Sofia.

  • Which aircraft models fly most regularly from St. Louis to Sofia?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Sofia?

    Star Alliance is the only airline alliance operating flights between St. Louis and Sofia.

  • Which is the best airline for flights from St. Louis to Sofia, United Airlines or Lufthansa?

    The two airlines most popular with KAYAK users for flights from St. Louis to Sofia are United Airlines and Lufthansa. With an average price for the route of $883 and an overall rating of 7.4, United Airlines is the most popular choice. Lufthansa is also a great choice for the route, with an average price of $929 and an overall rating of 6.8.

  • How does KAYAK find such low prices on flights from St. Louis to Sofia?

    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 Sofia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Sofia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from St. Louis 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 Sofia?

    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 to Sofia with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SOF can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Sofia?

    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 to Sofia from St. Louis 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 Sofia

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Sofia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Sofia? 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 9092 reviews
6.6Food
7.3Comfort
7.1Entertainment
7.7Boarding
8.1Crew
Airline reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

10.0 ExcellentRoger, Dec 2025
CAE - ORD
Read more United Airlines reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

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!

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.

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

Information on your arrival and departure airports