STL - OTP

$331 Find Cheap Flights from St. Louis to Bucharest

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 Bucharest departing on 10/15. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Bucharest Otopeni Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Bucharest, 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 Bucharest, as well as popular online travel agencies
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Flight Deals

Cheap Flights from St. Louis to Bucharest (STL-OTP)

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

Sun, Nov 16 - Wed, Nov 26
Lufthansa Logo
3:50 pm - 2:05 pmSTL-OTP
14h 15m1 stop
Lufthansa Logo
6:05 am - 1:55 pmOTP-STL
15h 50m1 stop
$575Lufthansa
Find Deal
Mon, Nov 17 - Wed, Nov 26
United Airlines Logo
5:24 pm - 6:35 pmSTL-OTP
17h 11m2 stops
United Airlines Logo
6:05 am - 1:55 pmOTP-STL
15h 50m1 stop
$580United Airlines
Find Deal
Sun, Nov 16 - Wed, Nov 26
United Airlines Logo
10:00 am - 2:05 pmSTL-OTP
20h 05m2 stops
United Airlines Logo
6:05 am - 1:55 pmOTP-STL
15h 50m1 stop
$584United Airlines
Find Deal
Mon, Nov 17 - Tue, Nov 25
United Airlines Logo
6:43 pm - 6:35 pmSTL-OTP
15h 52m2 stops
United Airlines Logo
5:55 am - 7:39 pmOTP-STL
21h 44m2 stops
$585United Airlines
Find Deal
Sun, Nov 16 - Thu, Nov 27
United Airlines Logo
3:50 pm - 2:05 pmSTL-OTP
14h 15m1 stop
United Airlines Logo
5:50 am - 3:29 pmOTP-STL
41h 39m2 stops
$587United Airlines
Find Deal
Sun, Nov 16 - Wed, Nov 26
United Airlines Logo
6:43 pm - 6:25 pmSTL-OTP
15h 42m2 stops
United Airlines Logo
6:05 am - 5:39 pmOTP-STL
19h 34m2 stops
$590United Airlines
Find Deal
Sat, Nov 15 - Wed, Nov 26
Air Canada Logo
4:05 pm - 2:05 pmSTL-OTP
38h 00m2 stops
Air Canada Logo
6:05 am - 3:29 pmOTP-STL
41h 24m2 stops
$597Air Canada
Find Deal
Sun, Nov 16 - Tue, Nov 25
Lufthansa Logo
3:50 pm - 6:25 pmSTL-OTP
18h 35m1 stop
Lufthansa Logo
7:25 pm - 1:55 pmOTP-STL
26h 30m1 stop
$600Lufthansa
Find Deal
Wed, Nov 19 - Sun, Nov 23
Air Canada Logo
4:05 pm - 3:50 pmSTL-OTP
15h 45m2 stops
Air Canada Logo
5:55 am - 3:29 pmOTP-STL
41h 34m2 stops
$641Air Canada
Find Deal
Fri, Dec 12 - Sun, Jan 18
British Airways Logo
10:47 am - 3:10 pmSTL-OTP
20h 23m2 stops
British Airways Logo
7:35 am - 8:23 pmOTP-STL
20h 48m2 stops
$728British Airways
Find Deal

Everything you should know

Top airlines
Lufthansa
Cheapest • from $575 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$575
Lufthansa
Sun 11/16Wed 11/26
STL - OTP • 1 stop
Cheapest one-way
$331
Multiple Airlines
Wed 10/15
STL - OTP • 3 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Bucharest!
Booking Insights

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

Get data-powered insights and trends into flights from St. Louis to Bucharest to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from St. Louis to Bucharest?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from St. Louis to Bucharest were found on Lufthansa ($575) and United Airlines ($580).

Good to know

Low seasonSeptember
Cheapest flight$331
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly and prices are also 16% lower on average.
Flight from St. Louis to Bucharest

When to book flights from St. Louis to Bucharest

Are your dates flexible? Find out the best times to travel from St. Louis to Bucharest 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 St. Louis to Bucharest flights

  • What is the cheapest flight from St. Louis to Bucharest Otopeni Intl Airport?

    In the last 3 days, the lowest price for a flight from St. Louis to Bucharest Otopeni Intl Airport was $331 for a one-way ticket and $575 for a round-trip.

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

    Yes, you’ll need a passport to travel to Bucharest from St. Louis.

  • Which airports will I be using when flying from St. Louis to Bucharest?

    St. Louis and Bucharest are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Bucharest Otopeni Intl.

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

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

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

    Star Alliance, and oneworld are the airline alliances operating flights between St. Louis and Bucharest, with Star Alliance being the most commonly used for this route.

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Bucharest are United Airlines and Lufthansa. With an average price for the route of $941 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 $1,068 and an overall rating of 6.8.

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

    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 Bucharest.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bucharest 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 Bucharest?

    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 Bucharest with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and OTP 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 Bucharest?

    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 Bucharest 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 Bucharest

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Bucharest. 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 Bucharest? 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 8924 reviews
7.3Comfort
7.1Entertainment
6.6Food
7.7Boarding
8.1Crew
Airline reviews

Terrible. They wouldn't allow me on my flight on the 14th..

2.0 MediocreJulian, Sep 2025DEN - DRO
Read more United Airlines reviews

Terrible. They wouldn't allow me on my flight on the 14th..

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.

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 Bucharest

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