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Cheap flights from St. Louis to Bucharest from $318

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 3/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
7:05 am - 2:05 pm
STL
-
OTP
23h 00m
2 stops
British Airways Logo
8:15 am - 11:48 pm
OTP
-
STL
23h 33m
2 stops
$539British Airways
Sun, Apr 19 - Tue, Apr 28
Lufthansa Logo
6:55 pm - 1:05 am
STL
-
OTP
22h 10m
2 stops
Lufthansa Logo
6:05 am - 10:59 pm
OTP
-
STL
23h 54m
2 stops
$542Lufthansa
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
3:30 pm - 4:30 pm
STL
-
OTP
17h 00m
1 stop
Multiple Airlines Logo
1:50 pm - 3:24 pm
OTP
-
STL
33h 34m
2 stops
$545Multiple Airlines
Sun, Mar 29 - Tue, Apr 14
Lufthansa Logo
3:30 pm - 12:50 pm
STL
-
OTP
13h 20m
1 stop
Lufthansa Logo
6:05 am - 1:25 pm
OTP
-
STL
15h 20m
1 stop
$550Lufthansa
Wed, Apr 8 - Wed, Apr 15
United Airlines Logo
2:40 pm - 6:35 pm
STL
-
OTP
19h 55m
2 stops
United Airlines Logo
6:05 am - 8:54 pm
OTP
-
STL
22h 49m
2 stops
$552United Airlines
Wed, Apr 8 - Wed, Apr 15
Lufthansa Logo
3:30 pm - 4:20 pm
STL
-
OTP
16h 50m
1 stop
Lufthansa Logo
6:05 am - 9:08 pm
OTP
-
STL
23h 03m
2 stops
$553Lufthansa
Wed, Apr 8 - Wed, Apr 15
United Airlines Logo
3:30 pm - 4:30 pm
STL
-
OTP
17h 00m
1 stop
United Airlines Logo
6:05 am - 9:08 pm
OTP
-
STL
23h 03m
2 stops
$555United Airlines
Sun, Mar 29 - Tue, Apr 14
Lufthansa Logo
3:30 pm - 4:30 pm
STL
-
OTP
17h 00m
1 stop
Lufthansa Logo
5:15 pm - 1:25 pm
OTP
-
STL
28h 10m
1 stop
$559Lufthansa
Sun, Mar 29 - Tue, Apr 14
United Airlines Logo
3:30 pm - 4:30 pm
STL
-
OTP
17h 00m
1 stop
United Airlines Logo
1:50 pm - 3:24 pm
OTP
-
STL
33h 34m
2 stops
$560United Airlines
Sun, Apr 19 - Tue, Apr 28
Lufthansa Logo
3:30 pm - 1:05 pm
STL
-
OTP
13h 35m
1 stop
Lufthansa Logo
5:15 pm - 1:25 pm
OTP
-
STL
28h 10m
1 stop
$570Lufthansa
Sun, Apr 19 - Tue, Apr 28

United Airlines flights from St. Louis to Bucharest

Our best United Airlines deals on St. Louis to Bucharest flight tickets
United Airlines
Apr 8
STL2:40 pmLambert-St Louis
19h 55m
2 stops
OTP6:35 pmBucharest Otopeni Intl
Apr 15
OTP6:05 amBucharest Otopeni Intl
22h 49m
2 stops
STL8:54 pmLambert-St Louis
$552
United Airlines
Mar 18
STL8:30 amLambert-St Louis
20h 50m
2 stops
OTP12:20 pmBucharest Otopeni Intl
Mar 25
OTP6:05 amBucharest Otopeni Intl
22h 37m
2 stops
STL9:42 pmLambert-St Louis
$553
United Airlines
Mar 29
STL3:30 pmLambert-St Louis
17h 00m
1 stop
OTP4:30 pmBucharest Otopeni Intl
Apr 14
OTP6:05 amBucharest Otopeni Intl
23h 03m
2 stops
STL9:08 pmLambert-St Louis
$555

Lufthansa flights from St. Louis to Bucharest

Our best Lufthansa deals on St. Louis to Bucharest flight tickets
Lufthansa
Mar 2
STL6:55 pmLambert-St Louis
22h 10m
2 stops
OTP1:05 amBucharest Otopeni Intl
Mar 9
OTP6:05 amBucharest Otopeni Intl
23h 54m
2 stops
STL10:59 pmLambert-St Louis
$542
Lufthansa
Apr 8
STL3:30 pmLambert-St Louis
16h 50m
1 stop
OTP4:20 pmBucharest Otopeni Intl
Apr 15
OTP6:05 amBucharest Otopeni Intl
15h 20m
1 stop
STL1:25 pmLambert-St Louis
$548
Lufthansa
Apr 8
STL3:30 pmLambert-St Louis
13h 20m
1 stop
OTP12:50 pmBucharest Otopeni Intl
Apr 15
OTP6:05 amBucharest Otopeni Intl
15h 20m
1 stop
STL1:25 pmLambert-St Louis
$550

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 February 4, 2026.
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

Sun 4/19

7:05 am-2:05 pm

2 stops23h 00m

Bucharest Otopeni Intl

Tue 4/28

8:15 am-11:48 pm

2 stops23h 33m

$539

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 3/2

6:55 pm-1:05 am

2 stops22h 10m

Bucharest Otopeni Intl

Mon 3/9

6:05 am-10:59 pm

2 stops23h 54m

$542

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 3/29

3:30 pm-4:30 pm

1 stop17h 00m

Bucharest Otopeni Intl

Tue 4/14

1:50 pm-3:24 pm

2 stops33h 34m

$545

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/8

3:30 pm-12:50 pm

1 stop13h 20m

Bucharest Otopeni Intl

Wed 4/15

6:05 am-1:25 pm

1 stop15h 20m

$550

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/8

2:40 pm-6:35 pm

2 stops19h 55m

Bucharest Otopeni Intl

Wed 4/15

6:05 am-8:54 pm

2 stops22h 49m

$552

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/8

3:30 pm-4:20 pm

1 stop16h 50m

Bucharest Otopeni Intl

Wed 4/15

6:05 am-9:08 pm

2 stops23h 03m

$553

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 3/29

3:30 pm-4:30 pm

1 stop17h 00m

Bucharest Otopeni Intl

Tue 4/14

6:05 am-9:08 pm

2 stops23h 03m

$555

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 3/29

3:30 pm-4:30 pm

1 stop17h 00m

Bucharest Otopeni Intl

Tue 4/14

5:15 pm-1:25 pm

1 stop28h 10m

$559

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 4/19

3:30 pm-4:30 pm

1 stop17h 00m

Bucharest Otopeni Intl

Tue 4/28

1:50 pm-3:24 pm

2 stops33h 34m

$560

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 4/19

3:30 pm-1:05 pm

1 stop13h 35m

Bucharest Otopeni Intl

Tue 4/28

5:15 pm-1:25 pm

1 stop28h 10m

$570

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

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

15h 40m

Direct flights

None
The fastest flight from St. Louis to Bucharest takes 15h 40m
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 15h 40m, 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 $707Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
LufthansaPriceFrom $780Free CancellationRating
6.8
7,759 reviews
Search Lufthansa flights

Traveling to a place near Bucharest?

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

Why use momondo?

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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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