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Cheap flights from St. Louis to Bucharest from $842

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Bucharest departing on 9/7. 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.
Multiple Airlines Logo
8:55 am - 12:00 pm
STL
-
OTP
19h 05m
2 stops
Multiple Airlines Logo
6:15 am - 1:25 pm
OTP
-
STL
15h 10m
2 stops
$842Multiple Airlines
Mon, Sep 7 - Wed, Sep 16
United Airlines Logo
5:30 pm - 1:10 am
STL
-
OTP
23h 40m
2 stops
United Airlines Logo
6:05 am - 1:25 pm
OTP
-
STL
15h 20m
1 stop
$843United Airlines
Mon, Sep 7 - Wed, Sep 16
Lufthansa Logo
3:30 pm - 4:20 pm
STL
-
OTP
16h 50m
1 stop
Lufthansa Logo
6:05 am - 1:25 pm
OTP
-
STL
15h 20m
1 stop
$851Lufthansa
Mon, Sep 7 - Wed, Sep 16
Multiple Airlines Logo
12:10 pm - 6:35 pm
STL
-
OTP
22h 25m
2 stops
Multiple Airlines Logo
6:05 am - 1:25 pm
OTP
-
STL
15h 20m
1 stop
$944Multiple Airlines
Wed, Jul 8 - Tue, Sep 1
Multiple Airlines Logo
8:55 am - 12:00 pm
STL
-
OTP
19h 05m
2 stops
Multiple Airlines Logo
6:05 am - 1:25 pm
OTP
-
STL
15h 20m
1 stop
$950Multiple Airlines
Wed, Jul 8 - Tue, Sep 1
Multiple Airlines Logo
12:10 pm - 6:35 pm
STL
-
OTP
22h 25m
2 stops
Multiple Airlines Logo
6:15 am - 1:25 pm
OTP
-
STL
15h 10m
2 stops
$960Multiple Airlines
Wed, Jul 8 - Tue, Sep 1
Multiple Airlines Logo
8:55 am - 12:00 pm
STL
-
OTP
19h 05m
2 stops
Multiple Airlines Logo
6:15 am - 1:25 pm
OTP
-
STL
15h 10m
2 stops
$967Multiple Airlines
Wed, Jul 8 - Tue, Sep 1
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
$1,083Lufthansa
Wed, Jul 8 - Tue, Sep 1
Lufthansa Logo
7:05 pm - 6:35 pm
STL
-
OTP
15h 30m
2 stops
Lufthansa Logo
6:15 am - 3:31 pm
OTP
-
STL
17h 16m
2 stops
$1,085Lufthansa
Thu, Jul 9 - Sat, Sep 5
United Airlines Logo
12:23 pm - 12:00 pm
STL
-
OTP
15h 37m
2 stops
United Airlines Logo
6:15 am - 3:38 pm
OTP
-
STL
41h 23m
3 stops
$1,097United Airlines
Fri, Jul 10 - Sat, Sep 5

Delta flights from St. Louis to Bucharest

Our best Delta deals on St. Louis to Bucharest flight tickets
Delta
Jun 24
STL6:30 amLambert-St Louis
22h 15m
2 stops
OTP12:45 pmBucharest Otopeni Intl
Jul 10
OTP2:00 pmBucharest Otopeni Intl
18h 41m
2 stops
STL12:41 amLambert-St Louis
$1,228
Delta
Jun 18
STL6:10 pmLambert-St Louis
15h 10m
2 stops
OTP5:20 pmBucharest Otopeni Intl
Jul 10
OTP7:05 amBucharest Otopeni Intl
21h 32m
2 stops
STL8:37 pmLambert-St Louis
$1,302
Delta
Jun 19
STL6:10 pmLambert-St Louis
15h 30m
2 stops
OTP5:40 pmBucharest Otopeni Intl
Jul 10
OTP7:05 amBucharest Otopeni Intl
21h 32m
2 stops
STL8:37 pmLambert-St Louis
$1,303

Air Canada flights from St. Louis to Bucharest

Our best Air Canada deals on St. Louis to Bucharest flight tickets
Air Canada
Jun 20
STL1:20 pmLambert-St Louis
42h 00m
2 stops
OTP3:20 pmBucharest Otopeni Intl
Jul 10
OTP6:20 amBucharest Otopeni Intl
20h 22m
2 stops
STL6:42 pmLambert-St Louis
$1,289
Air Canada
Jun 18
STL1:20 pmLambert-St Louis
21h 15m
2 stops
OTP6:35 pmBucharest Otopeni Intl
Jul 10
OTP6:20 amBucharest Otopeni Intl
20h 22m
2 stops
STL6:42 pmLambert-St Louis
$1,357
Air Canada
Jun 2
STL7:22 amLambert-St Louis
23h 58m
3 stops
OTP3:20 pmBucharest Otopeni Intl
Jun 16
OTP6:20 amBucharest Otopeni Intl
22h 05m
3 stops
STL8:25 pmLambert-St Louis
$1,378

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 May 12, 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

Cheapest round-trip

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 9/7

8:55 am-12:00 pm

2 stops19h 05m

Bucharest Otopeni Intl

Wed 9/16

6:15 am-1:25 pm

2 stops15h 10m

$842

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 9/7

5:30 pm-1:10 am

2 stops23h 40m

Bucharest Otopeni Intl

Wed 9/16

6:05 am-1:25 pm

1 stop15h 20m

$843

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 9/7

3:30 pm-4:20 pm

1 stop16h 50m

Bucharest Otopeni Intl

Wed 9/16

6:05 am-1:25 pm

1 stop15h 20m

$851

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 7/8

12:10 pm-6:35 pm

2 stops22h 25m

Bucharest Otopeni Intl

Tue 9/1

6:05 am-1:25 pm

1 stop15h 20m

$944

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 7/8

8:55 am-12:00 pm

2 stops19h 05m

Bucharest Otopeni Intl

Tue 9/1

6:05 am-1:25 pm

1 stop15h 20m

$950

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 7/8

12:10 pm-6:35 pm

2 stops22h 25m

Bucharest Otopeni Intl

Tue 9/1

6:15 am-1:25 pm

2 stops15h 10m

$960

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 7/8

8:55 am-12:00 pm

2 stops19h 05m

Bucharest Otopeni Intl

Tue 9/1

6:15 am-1:25 pm

2 stops15h 10m

$967
Quickest round-trip

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 7/8

3:30 pm-12:50 pm

1 stop13h 20m

Bucharest Otopeni Intl

Tue 9/1

6:05 am-1:25 pm

1 stop15h 20m

$1,083

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Thu 7/9

7:05 pm-6:35 pm

2 stops15h 30m

Bucharest Otopeni Intl

Sat 9/5

6:15 am-3:31 pm

2 stops17h 16m

$1,085

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Fri 7/10

12:23 pm-12:00 pm

2 stops15h 37m

Bucharest Otopeni Intl

Sat 9/5

6:15 am-3:38 pm

3 stops41h 23m

$1,097

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 month to fly to Bucharest?

In general, February is the cheapest month to fly from St. Louis to Bucharest. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you aren’t able to travel to Bucharest during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $0.

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

You could potentially save up to 42% 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

17h 05m

Direct flights

None
The fastest flight from St. Louis to Bucharest takes 17h 05m
There are no direct flights from St. Louis to Bucharest. There are no popular flight routes from St. Louis to Bucharest.
Search flight deals

Frequently asked questions about flying from St. Louis to Bucharest

  • 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 17h 05m, 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 $574Free CancellationRating
7.4
9,701 reviews
Search United Airlines flights
LufthansaPriceFrom $800Free CancellationRating
6.8
7,992 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.

I’m not ready to book a flight from St. Louis to Bucharest right now. Can momondo alert me if prices change?

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