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Otopeni Intl

$280+ Cheap flights from St. Louis (STL) to Otopeni Intl (OTP)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OTP
Jan 28 — Feb 41
Wed 1/28
Wed 2/4
1 adult, Economy
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Cheap flight deals from St. Louis to Otopeni Intl

Best flights from St. Louis to Otopeni Intl
Discover carefully curated flight deals from St. Louis to Otopeni Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 29, 2025.

This British Airways deal was found by Cheapflights users on 12/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:00 pmSTL - OTP
1 stop19h 25mBritish Airways
Wed 5/138:25 amOTP - STL
1 stop19h 05mBritish Airways
Deal found 12/27$539
This United Airlines deal was found by Cheapflights users on 12/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:30 amSTL - OTP
2 stops25h 05mUnited Airlines
Wed 5/136:05 amOTP - STL
1 stop15h 20mUnited Airlines
Deal found 12/27$541
This KAYAK deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/293:30 pmSTL - OTP
1 stop13h 20mLufthansa
Mon 5/47:20 pmOTP - STL
2 stops33h 44mLufthansa
Deal found 12/28$576
This United Airlines deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/293:30 pmSTL - OTP
1 stop13h 20mUnited Airlines
Wed 5/66:05 amOTP - STL
1 stop15h 20mUnited Airlines
Deal found 12/28$548
This KAYAK deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/110:00 pmSTL - OTP
1 stop13h 05mBritish Airways
Wed 5/68:25 amOTP - STL
1 stop19h 05mBritish Airways
Deal found 12/28$584
This United Airlines deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/293:30 pmSTL - OTP
1 stop13h 20mUnited Airlines
Fri 5/86:05 amOTP - STL
1 stop15h 20mUnited Airlines
Deal found 12/28$548
This United Airlines deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/293:30 pmSTL - OTP
1 stop13h 20mUnited Airlines
Thu 5/76:05 amOTP - STL
2 stops22h 00mUnited Airlines
Deal found 12/28$552
This United Airlines deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2911:15 amSTL - OTP
2 stops17h 35mUnited Airlines
Tue 5/56:05 amOTP - STL
2 stops22h 00mUnited Airlines
Deal found 12/28$556

Find flight deals from St. Louis to Otopeni Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Otopeni Intl (OTP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$534
(KAYAK)

One-way from

$280
(oojo)

Popular in

June

Cheapest in

November

Average price

$1,017
Provider with most accurate pricing for Lambert-St Louis-Bucharest Otopeni Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Bucharest Otopeni Intl flights.
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From Lambert-St Louis to Bucharest Otopeni Intl
Search Deals
One-way flight from Lambert-St Louis to Bucharest Otopeni Intl
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($260 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Otopeni Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 29, 2025.
Use the filters below to find and compare flights from St. Louis to Bucharest Otopeni Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Otopeni Intl

Route

Depart

Return

Price

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 5/5

10:00 pm-1:25 am

1 stop19h 25m

Bucharest Otopeni Intl

Wed 5/13

8:25 am-7:30 pm

1 stop19h 05m

$539

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 5/5

9:30 am-6:35 pm

2 stops25h 05m

Bucharest Otopeni Intl

Wed 5/13

6:05 am-1:25 pm

1 stop15h 20m

$541

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/29

3:30 pm-12:50 pm

1 stop13h 20m

Bucharest Otopeni Intl

Wed 5/6

6:05 am-1:25 pm

1 stop15h 20m

$548

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/29

3:30 pm-12:50 pm

1 stop13h 20m

Bucharest Otopeni Intl

Fri 5/8

6:05 am-1:25 pm

1 stop15h 20m

$548

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/29

3:30 pm-12:50 pm

1 stop13h 20m

Bucharest Otopeni Intl

Thu 5/7

6:05 am-8:05 pm

2 stops22h 00m

$552

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/29

11:15 am-12:50 pm

2 stops17h 35m

Bucharest Otopeni Intl

Tue 5/5

6:05 am-8:05 pm

2 stops22h 00m

$556

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/29

3:30 pm-12:50 pm

1 stop13h 20m

Bucharest Otopeni Intl

Mon 5/4

7:20 pm-9:04 pm

2 stops33h 44m

$576

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 5/1

10:00 pm-7:05 pm

1 stop13h 05m

Bucharest Otopeni Intl

Wed 5/6

8:25 am-7:30 pm

1 stop19h 05m

$584

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 5/1

10:00 pm-7:05 pm

1 stop13h 05m

$280

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 5/1

6:11 pm-7:05 pm

2 stops16h 54m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Showing 1-10 of 11 results
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2

Compare providers for flights from St. Louis to Otopeni Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Otopeni Intl in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Bucharest Otopeni Intl Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Bucharest Otopeni Intl Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Bucharest Otopeni Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Bucharest Otopeni Intl Airport flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Bucharest Otopeni Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Otopeni Intl

Have a flexible travel schedule? Discover the best time to fly to Otopeni Intl from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Otopeni Intl

Get insights into the airlines that provide service to Otopeni Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Otopeni Intl. Reviews last updated December 29, 2025.
Read reviews from past customers who have flown United Airlines and Lufthansa from St. Louis to Bucharest Otopeni Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,118 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,118 reviews
United Airlines
7.4
Good
9,118 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
Lufthansa
6.8
Okay
7,659 reviews
United Airlines
7.4
Good
9,118 reviews

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.6

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Otopeni Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Bucharest Otopeni Intl?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Bucharest Otopeni Intl from St. Louis. Booking flights from Lambert-St Louis (STL) to Bucharest Otopeni Intl should be relatively easy as there are 0 daily outbound flights to Bucharest Otopeni Intl from 2 different airlines.

  • How long is the flight from St. Louis to Bucharest Otopeni Intl Airport?

    For as low as $539, British Airways can have you in Bucharest Otopeni Intl Airport from St. Louis in 19h 25m. The distance between St. Louis and Bucharest Otopeni Intl Airport is about 5451 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from St. Louis to Bucharest Otopeni Intl Airport round-trip?

    According to our current data, United Airlines ($784), and Lufthansa ($800) offers the cheapest pricing from St. Louis to Bucharest Otopeni Intl Airport.

  • Can I find deals for flights from St. Louis to Otopeni Intl that include hotel bookings?

    Yes. In addition to deals on St. Louis to Otopeni Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Otopeni Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Otopeni Intl.

  • Can I find deals for business class flights from St. Louis to Otopeni Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Otopeni Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Bucharest Otopeni Intl Airport?

Book flights to Bucharest Otopeni Intl Airport if you plan to visit one of these locations
Otopeni

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Alternative routes for St. Louis to Otopeni Intl

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Otopeni Intl flights
Springfield to Otopeni Intl flights
Columbia to Otopeni Intl flights

Top 2 airlines flying from St. Louis to Otopeni Intl

Discover the top 2 airlines that operate flights from St. Louis to Otopeni Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$784Average$960FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$800Average$1,160FlexibilityNo cancel feeOn-time76%

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