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$331+ Cheap flights from St. Louis (STL) to Bucharest (BUH)

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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUH
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from St. Louis to Bucharest

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Bucharest (BUH). 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 September 17, 2025.

Round-trip from

$575
(Kiwi.com)

One-way from

$331
(Kiwi.com)
From Lambert-St Louis to Bucharest (BUH)
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One-way flight from Lambert-St Louis to Bucharest (BUH)
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Find flight deals from St. Louis to Bucharest

Cheapest flights from St. Louis to Bucharest
Explore the most affordable flight options available from St. Louis to Bucharest. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/163:50 pmSTL - OTP
1 stop14h 15mLufthansa
Wed 11/266:05 amOTP - STL
1 stop15h 50mLufthansa
Deal found 9/16$575
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Mon 11/175:24 pmSTL - OTP
2 stops17h 11mUnited Airlines
Wed 11/266:05 amOTP - STL
1 stop15h 50mUnited Airlines
Deal found 9/16$580
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sun 11/1610:00 amSTL - OTP
2 stops20h 05mUnited Airlines
Wed 11/266:05 amOTP - STL
1 stop15h 50mUnited Airlines
Deal found 9/16$584
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Mon 11/176:43 pmSTL - OTP
2 stops15h 52mUnited Airlines
Tue 11/255:55 amOTP - STL
2 stops21h 44mUnited Airlines
Deal found 9/16$585
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sun 11/163:50 pmSTL - OTP
1 stop14h 15mUnited Airlines
Thu 11/275:50 amOTP - STL
2 stops41h 39mUnited Airlines
Deal found 9/16$587
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sun 11/165:24 pmSTL - OTP
2 stops17h 01mUnited Airlines
Tue 11/255:55 amOTP - STL
2 stops21h 44mUnited Airlines
Deal found 9/16$590
This Air Canada deal was found by Cheapflights users on 9/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:05 pmSTL - OTP
2 stops42h 20mAir Canada
Thu 11/275:50 amOTP - STL
2 stops41h 39mAir Canada
Deal found 9/16$597
This Lufthansa deal was found by Cheapflights users on 9/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/163:50 pmSTL - OTP
1 stop18h 35mLufthansa
Tue 11/257:25 pmOTP - STL
1 stop26h 30mLufthansa
Deal found 9/16$600
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Mon 11/176:43 pmSTL - OTP
2 stops15h 52mUnited Airlines
Mon 11/242:50 pmOTP - STL
2 stops31h 35mUnited Airlines
Deal found 9/16$605
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sun 11/163:50 pmSTL - OTP
1 stop14h 15mUnited Airlines
Mon 11/242:50 pmOTP - STL
2 stops31h 35mUnited Airlines
Deal found 9/16$609
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:50 pmSTL - OTP
1 stop14h 20mLufthansa
Wed 11/266:05 amOTP - STL
1 stop15h 50mLufthansa
Deal found 9/16$629
This Lufthansa deal was found by Cheapflights users on 9/16. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/166:43 pmSTL - OTP
2 stops15h 52mLufthansa
Sun 11/235:55 amOTP - STL
1 stop16h 00mLufthansa
Deal found 9/16$630

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Bucharest 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 September 17, 2025.
Use the filters below to find and compare flights from St. Louis to Bucharest that are best for you.

Fly from

St. Louis

Fly to

Bucharest

Route

Depart

Return

Price

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 11/16

10:00 am-2:05 pm

2 stops20h 05m

Bucharest Otopeni Intl

Wed 11/26

6:05 am-1:55 pm

1 stop15h 50m

$584

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 11/18

8:25 am-1:55 pm

2 stops21h 30m

Bucharest Otopeni Intl

Wed 11/26

6:05 am-1:55 pm

1 stop15h 50m

$584

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 11/17

6:43 pm-6:35 pm

2 stops15h 52m

Bucharest Otopeni Intl

Wed 11/26

6:05 am-5:39 pm

2 stops19h 34m

$585

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 11/18

1:10 pm-1:55 pm

2 stops16h 45m

Bucharest Otopeni Intl

Tue 11/25

5:55 am-2:25 pm

2 stops16h 30m

$590

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 11/16

5:24 pm-6:25 pm

2 stops17h 01m

Bucharest Otopeni Intl

Tue 11/25

5:55 am-7:39 pm

2 stops21h 44m

$590

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 11/16

5:24 pm-6:25 pm

2 stops17h 01m

Bucharest Otopeni Intl

Thu 11/27

5:50 am-2:23 pm

2 stops16h 33m

$590

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 11/19

12:31 pm-2:00 pm

2 stops17h 29m

Bucharest Otopeni Intl

Tue 11/25

5:55 am-5:39 pm

2 stops19h 44m

$590

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 11/18

11:49 am-6:25 pm

2 stops22h 36m

Bucharest Otopeni Intl

Thu 11/27

5:50 am-2:23 pm

2 stops16h 33m

$590

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 11/17

6:43 pm-6:35 pm

2 stops15h 52m

Bucharest Otopeni Intl

Tue 11/25

7:25 pm-1:55 pm

1 stop26h 30m

$600

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 11/17

6:43 pm-6:35 pm

2 stops15h 52m

Bucharest Otopeni Intl

Mon 11/24

2:50 pm-2:25 pm

2 stops31h 35m

$605

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 16 results
1
2

Best time to book a flight from St. Louis to Bucharest

Have a flexible travel schedule? Discover the best time to fly to Bucharest 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Bucharest

What is the cheapest time of day to fly from STL to BUH?

Find hourly flight availability from St. Louis to Bucharest. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

When flying from St. Louis to Bucharest, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 20% versus a flight in the afternoon.

Reviews of airlines servicing Bucharest

Get insights into the airlines that provide service to Bucharest. 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 Bucharest. Reviews last updated September 17, 2025.
Read reviews from past customers who have flown Delta, Air Canada, and Lufthansa from St. Louis to Bucharest. 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.
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
10,000 reviews
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Lufthansa
6.8
Okay
7,409 reviews
Delta
8.0
Very good
7,961 reviews

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Bucharest. 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?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Bucharest. On average, Lambert-St Louis has 0 outbound flights to Bucharest per day from 2 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

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

    There are many flights that can get you from St. Louis to Bucharest in 20h 05m. Fly via United Airlines to get the fastest option. The distance from St. Louis to Bucharest is about 5451 mi.

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

    Currently priced at $772, Lufthansa will fly you from St. Louis to Bucharest and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $784.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from St. Louis to Bucharest?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Bucharest (average of $604). Flying from St. Louis to Bucharest in June is currently the most expensive (average of $1,132). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Bucharest?

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

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from St. Louis to Bucharest

Discover the top 2 airlines that operate flights from St. Louis to Bucharest. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$772Average$1,068FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$784Average$941FlexibilityNo cancel feeOn-time69%

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