STL - SOF

$309 Find Cheap Flights from St. Louis to Sofia

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 Sofia departing on 10/12. 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
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Everything you should know

Cheapest round-trip
$769
Typical prices: $845-$760
United Airlines
Sun 11/8Fri 11/20
STL - SOF • 2 stops
Cheapest one-way
$309
Multiple Airlines
Mon 10/12
STL - SOF • 3 stops
Top airlines
Cheapest • from $769 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Sofia. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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

Sun, Nov 8 - Fri, Nov 20
United Airlines Logo
3:15 pm - 6:20 pm
STL
-
SOF
19h 05m
2 stops
United Airlines Logo
6:25 am - 1:45 pm
SOF
-
STL
15h 20m
1 stop
$769United Airlines
Wed, Nov 11 - Wed, Nov 18
Lufthansa Logo
3:40 pm - 1:25 pm
STL
-
SOF
13h 45m
1 stop
Lufthansa Logo
6:25 am - 1:45 pm
SOF
-
STL
15h 20m
1 stop
$776Lufthansa
Sun, Nov 8 - Wed, Nov 18
United Airlines Logo
3:40 pm - 6:10 pm
STL
-
SOF
18h 30m
1 stop
United Airlines Logo
6:25 am - 1:45 pm
SOF
-
STL
15h 20m
1 stop
$777United Airlines
Tue, Nov 10 - Wed, Nov 18
Multiple Airlines Logo
7:30 am - 1:15 pm
STL
-
SOF
21h 45m
2 stops
Multiple Airlines Logo
2:05 pm - 3:30 pm
SOF
-
STL
33h 25m
2 stops
$778Multiple Airlines
Wed, Oct 21 - Tue, Nov 3
United Airlines Logo
9:04 am - 12:10 pm
STL
-
SOF
19h 06m
2 stops
United Airlines Logo
6:25 am - 6:38 pm
SOF
-
STL
20h 13m
2 stops
$780United Airlines
Wed, Nov 11 - Tue, Nov 17
Multiple Airlines Logo
3:40 pm - 1:25 pm
STL
-
SOF
13h 45m
1 stop
Multiple Airlines Logo
6:25 am - 3:30 pm
SOF
-
STL
17h 05m
2 stops
$781Multiple Airlines
Wed, Nov 11 - Thu, Nov 19
Multiple Airlines Logo
3:40 pm - 6:10 pm
STL
-
SOF
18h 30m
1 stop
Multiple Airlines Logo
6:25 am - 3:30 pm
SOF
-
STL
17h 05m
2 stops
$785Multiple Airlines
Wed, Oct 21 - Tue, Nov 3
United Airlines Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
United Airlines Logo
6:25 am - 10:00 pm
SOF
-
STL
23h 35m
2 stops
$787United Airlines
Mon, Oct 26 - Tue, Nov 3
United Airlines Logo
11:45 am - 6:20 pm
STL
-
SOF
23h 35m
2 stops
United Airlines Logo
2:05 pm - 1:45 pm
SOF
-
STL
31h 40m
1 stop
$790United Airlines
Mon, Nov 9 - Mon, Nov 16
United Airlines Logo
7:30 am - 1:15 pm
STL
-
SOF
21h 45m
2 stops
United Airlines Logo
1:55 pm - 4:40 pm
SOF
-
STL
34h 45m
2 stops
$792United 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.

How much is a round-trip flight from St. Louis to Sofia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Sofia departing in November.

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

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

The cheapest month for flights from St. Louis to Sofia is October, where tickets cost $0 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is $1,209 and $1,170 respectively.

Good to know

Cheapest flight$309
Most popular time to fly and prices are also 7% lower on average.
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 5 days, the lowest price for a flight from St. Louis to Sofia was $309 for a one-way ticket and $769 for a round-trip.

  • 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 Air Canada?

    The two airlines most popular with KAYAK users for flights from St. Louis to Sofia are United Airlines and Air Canada. With an average price for the route of $800 and an overall rating of 7.4, United Airlines is the most popular choice. Air Canada is also a great choice for the route, with an average price of $1,209 and an overall rating of 7.1.

  • 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 3 airlines serving 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 9845 reviews
8.1Crew
6.6Food
7.3Comfort
7.7Boarding
7.1Entertainment
Airline reviews

Airline tickets are not cheap. You expect reliable competent service. Thanks to canceled flights and botched transfers we arrived at our destination two days late. This is not acceptable

2.0 MediocreAnonymous, Jun 2026
ORF - EWR
Read more United Airlines reviews

Airline tickets are not cheap. You expect reliable competent service. Thanks to canceled flights and botched transfers we arrived at our destination two days late. This is not acceptable

Horrible! Several delays and then was cancelled! I spent over 24 hours in the airport and was unable to get a hotel or food voucher.

The entertainment they offer could use some games, and maybe they could add some cookies to the snack menu. And the automated messages are a bit repetitive. But it was comfortable temperature wise and the seats were comfortable. The crew is very polite and helpful

The entertainment is a bit limited, it would be better if they added some games to play besides the movies and tv shows. But the seats are comfortable and the crew is polite

This planes staff was top tier. Everything went great and had a great flight home.

Food was great. Staff was phenomenal. Seats were a bit hard and could use a lot more entertainment options as far as movies to choose from. WiFi was good. Overall great trip.

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

I was promised by United Airline (operated by ANA) that I will be seated together with my kids as I am the only adult flying with two minors. We did not get seats together in our 11 hours flight from LA to Tokyo. When asked at the gate, ANA representative said United Airline should have informed them that there is a parent flying with two minors. He said they can’t do anything in the system as the flight is full. He ask me to ask passengers next to me and the kids if they are willing to change seats. This is ridiculous! However, I went in the flight and asked other passages but no one willing to change seats. 11 hours and we were seating separately. I was very disappointed with this. It made things super inconvenient for me.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Flight cancelled instead of leaving Friday am now, maybe, leaving Sunday

1didnt have wheel chair I ordered wheel chair in my ticket flight

Flight was overbooked and seats assigned to multiple passengers. Delay 1 hour to sort out.

Good but I don’t received my bags yet is been 5days still no update

It was pretty straight forward, no glitches or hidden costs

It was a short flight so, everything went smoothly and we got to where we needed to be safely.

Didn’t make it on the flight. Delayed then had to be rebooked, which in turn had me waiting at the airport for another 8 hours before next flight

No TV on the flight. The charging outlet was not working. No food, even a sandwich. The served orange was poor quality.

Selected seats 5 months prior to date. Had email confirmation and seats were not honoured. Family did not sit together

Loved and was pleasantly surprised by the food!! Request Lufthansa to help transiting passengers at Munich (confusion whether to go thru passport control or not).

The flight was comfortable and the staff were helpful and friendly. However, we did not know we were flying PAL until we arrived in Canada, so it was a bit disconcerting. In addition, which port we were leaving from was confusing.

We sat in our seats on the tarmac for almost 3 hours due to storms. They would not give us water or a snack. We were to depart at 7.30 pm and it was about 10.30 when we took off. No dinner until much after that. Beef type noodle dish was terrible with about a teaspoon of beef in it. The breakfast sweet waffle with egg and sausage inside was horrible. An English muffin sandwich would have been much better. Food was the worst in all of our years of traveling the world.

Our screen kept turning off ...3 times...had to get crew attention to turn it on again

They messed up my seat so I didn’t get the one I paid for

Put me on standby; flight was late; missed my connecting flight; disaster

Flight attendants were fine, seats a bit hard but I use a cushion for extra support. The only issue was it was a bit too cool and I needed to ask for and received and extra blanket. I survived!!!

Very few things and/or people are excellent. It was very good.

Extremely uncomfortable seats. Experience was like a Frontier Airlines flight. Would not fly it again.

Very, very tight legroom. They must’ve jammed in an additional few rows of seat seating. Denver to Munich was the least legroom I’ve ever had on any flight, let alone a multi hour international journey. I will not take that flight again.

In my first flight with Air Canada we sat in the plane for 4:00pm to 6:30pm. Finally we were asked to get off the plane and we were told the flight was cancelled after 7:00pm There was o clear explanation of what was the problem. I was booked without my permission on a Delta Flight at 7:30pm that was leaving at 8:00pm and I still had to go get my luggage(my final destination was Rome with one stop in Toronto. The luggage claim for Canada was closed so had to return to finally get it on the luggage belt.. Of course I missed the Delta flight and all the next day flights were booked. I also lost what I paid for my stay in Rome because I did nt cancel in time. A complete nightmare.

Good food, overall very comfy. The flight was full so obviously not optimal, but it is what it is.

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

Information on your arrival and departure airports