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Cheap flights from St. Louis to Bucharest from $439

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Bucharest departing on 1/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
3:50 pm - 2:10 pm
STL
-
OTP
14h 20m1 stop
Lufthansa Logo
5:55 am - 11:59 pm
OTP
-
STL
26h 04m2 stops
$494Lufthansa
Fri, Jan 30 - Fri, Feb 6
British Airways Logo
12:11 pm - 11:25 pm
STL
-
OTP
27h 14m2 stops
British Airways Logo
4:45 pm - 6:13 pm
OTP
-
STL
33h 28m2 stops
$537British Airways
Fri, Jan 30 - Fri, Feb 6
United Airlines Logo
3:50 pm - 2:10 pm
STL
-
OTP
14h 20m1 stop
United Airlines Logo
5:55 am - 3:15 pm
OTP
-
STL
41h 20m2 stops
$555United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
11:22 am - 2:10 pm
STL
-
OTP
18h 48m2 stops
United Airlines Logo
5:55 am - 3:15 pm
OTP
-
STL
41h 20m2 stops
$559United Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
6:30 am - 2:05 pm
STL
-
OTP
23h 35m2 stops
United Airlines Logo
5:55 am - 10:00 pm
OTP
-
STL
24h 05m2 stops
$563United Airlines
Thu, Jan 29 - Mon, Feb 2
British Airways Logo
3:37 pm - 11:25 pm
STL
-
OTP
23h 48m2 stops
British Airways Logo
4:40 pm - 9:15 pm
OTP
-
STL
36h 35m2 stops
$753British Airways
Fri, Jan 30 - Tue, Feb 3
British Airways Logo
10:00 pm - 12:25 am
STL
-
OTP
18h 25m1 stop
British Airways Logo
8:25 am - 7:30 pm
OTP
-
STL
19h 05m1 stop
$756British Airways
Wed, May 6 - Wed, May 27
British Airways Logo
9:15 am - 12:25 am
STL
-
OTP
31h 10m2 stops
British Airways Logo
4:15 pm - 11:23 pm
OTP
-
STL
39h 08m2 stops
$757British Airways
Wed, May 6 - Wed, May 27
Multiple Airlines Logo
9:57 am - 2:10 pm
STL
-
OTP
20h 13m3 stops
Multiple Airlines Logo
5:55 am - 3:29 pm
OTP
-
STL
41h 34m2 stops
$935Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
Air Canada Logo
9:57 am - 2:10 pm
STL
-
OTP
20h 13m3 stops
Air Canada Logo
6:55 am - 7:27 pm
OTP
-
STL
20h 32m3 stops
$1,144Air Canada
Fri, Jan 30 - Fri, Feb 6

Lufthansa flights from St. Louis to Bucharest

Our best Lufthansa deals on St. Louis to Bucharest flight tickets
Lufthansa
Jan 30
STL3:50 pmLambert-St Louis
14h 20m
1 stop
OTP2:10 pmBucharest Otopeni Intl
Feb 6
OTP5:55 amBucharest Otopeni Intl
26h 04m
2 stops
STL11:59 pmLambert-St Louis
$494
Find similar
Lufthansa
Dec 26
STL3:50 pmLambert-St Louis
14h 20m
1 stop
OTP2:10 pmBucharest Otopeni Intl
Dec 31
OTP6:05 amBucharest Otopeni Intl
15h 50m
1 stop
STL1:55 pmLambert-St Louis
$1,670
Find similar
Lufthansa
Dec 23
STL6:35 pmLambert-St Louis
45h 20m
2 stops
OTP11:55 pmBucharest Otopeni Intl
Dec 31
OTP2:40 pmBucharest Otopeni Intl
33h 47m
2 stops
STL4:27 pmLambert-St Louis
$1,770
Find similar

British Airways flights from St. Louis to Bucharest

Our best British Airways deals on St. Louis to Bucharest flight tickets
British Airways
Jan 30
STL12:11 pmLambert-St Louis
27h 14m
2 stops
OTP11:25 pmBucharest Otopeni Intl
Feb 6
OTP4:45 pmBucharest Otopeni Intl
33h 28m
2 stops
STL6:13 pmLambert-St Louis
$537
Find similar
British Airways
May 6
STL9:15 amLambert-St Louis
31h 10m
2 stops
OTP12:25 amBucharest Otopeni Intl
May 27
OTP8:25 amBucharest Otopeni Intl
19h 05m
1 stop
STL7:30 pmLambert-St Louis
$753
Find similar
British Airways
May 6
STL10:00 pmLambert-St Louis
18h 25m
1 stop
OTP12:25 amBucharest Otopeni Intl
May 27
OTP8:25 amBucharest Otopeni Intl
19h 05m
1 stop
STL7:30 pmLambert-St Louis
$756
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from St. Louis to Bucharest that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

3:50 pm-2:10 pm

1 stop14h 20m

Bucharest Otopeni Intl

Fri 2/6

5:55 am-11:59 pm

2 stops26h 04m

$494

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

12:11 pm-11:25 pm

2 stops27h 14m

Bucharest Otopeni Intl

Fri 2/6

4:45 pm-6:13 pm

2 stops33h 28m

$537

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

3:50 pm-2:10 pm

1 stop14h 20m

Bucharest Otopeni Intl

Tue 2/3

5:55 am-3:15 pm

2 stops41h 20m

$555

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

11:22 am-2:10 pm

2 stops18h 48m

Bucharest Otopeni Intl

Tue 2/3

5:55 am-3:15 pm

2 stops41h 20m

$559

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Thu 1/29

6:30 am-2:05 pm

2 stops23h 35m

Bucharest Otopeni Intl

Mon 2/2

5:55 am-10:00 pm

2 stops24h 05m

$563

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

3:37 pm-11:25 pm

2 stops23h 48m

Bucharest Otopeni Intl

Tue 2/3

4:40 pm-9:15 pm

2 stops36h 35m

$753

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 5/6

10:00 pm-12:25 am

1 stop18h 25m

Bucharest Otopeni Intl

Wed 5/27

8:25 am-7:30 pm

1 stop19h 05m

$756

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 5/6

9:15 am-12:25 am

2 stops31h 10m

Bucharest Otopeni Intl

Wed 5/27

4:15 pm-11:23 pm

2 stops39h 08m

$757

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

9:57 am-2:10 pm

3 stops20h 13m

Bucharest Otopeni Intl

Fri 2/6

5:55 am-3:29 pm

2 stops41h 34m

$935

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 1/30

9:57 am-2:10 pm

3 stops20h 13m

Bucharest Otopeni Intl

Fri 2/6

6:55 am-7:27 pm

3 stops20h 32m

$1,144

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Bucharest from

How to get the cheapest flight ticket from St. Louis to Bucharest

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Bucharest?

What is the cheapest day to depart on your flight to Bucharest?

Our data shows that Saturday is the least expensive day to fly to Bucharest. Tickets to fly out on this day can be as low as $813. The most expensive day to fly to Bucharest is Wednesday, with ticket prices averaging around $1,473.

What is the cheapest time of day to depart on your flight to Bucharest?

According to our data, the cheapest time of day to fly to Bucharest is in the morning. momondo users have found flights departing from St. Louis to Bucharest in the morning for as low as $1,059. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Bucharest is in the afternoon when prices are around $1,313.

Can stopping save me money on St. Louis to Bucharest flights?

You could potentially save up to 8% on your flight if you consider stops on a St. Louis to Bucharest flight.

When to book flights from St. Louis to Bucharest

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Bucharest according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Bucharest (STL to BUH) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Bucharest

Fastest flight time

14h 20m

Direct flights

None
The fastest flight from St. Louis to Bucharest takes 14h 20m
There are no direct flights from St. Louis to Bucharest. There are no popular flight routes from St. Louis to Bucharest.
Search flight deals

  • How far is Lambert-St Louis to Bucharest by plane?

    Lambert-St Louis and Bucharest are 5458.3 mi apart from one another. Flights usually cover this in 14h 20m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Bucharest?

    Prices for flights from Lambert-St Louis Airport to Bucharest are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Bucharest?

  • How old do you have to be to fly from Lambert-St Louis Airport to Bucharest?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Bucharest.

  • What documentation or ID do you need to fly to Bucharest?

    The travel and health documents required for your trip to Bucharest can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Bucharest. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Bucharest?

Best airlines flying from St. Louis to Bucharest

Compare and see reviews for airlines that fly from St. Louis to Bucharest with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $784Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
LufthansaPriceFrom $800Free CancellationRating
6.8
7,635 reviews
Search Lufthansa flights

Traveling to a place near Bucharest?

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

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Why should I use momondo to find a flight deal from St. Louis to Bucharest?

It is quick and easy to find St. Louis to Bucharest flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Bucharest that suits you.

Can I find flights from St. Louis to Bucharest with flexible booking policies on momondo?

All flight searches from St. Louis to Bucharest on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Bucharest?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Bucharest.

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Yes. momondo can track prices for St. Louis to Bucharest flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to Romania

Fly into one of these airports located in Bucharest

Airports listed have a maximum distance of 9.6 mi from Bucharest
Bucharest Otopeni Intl Airport