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Cheap flights from St. Louis to Bucharest from $390

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 3/22. 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.
Air Canada Logo
12:10 pm - 6:35 pm
STL
-
OTP
22h 25m
2 stops
Air Canada Logo
6:05 am - 6:27 pm
OTP
-
STL
44h 22m
2 stops
$558Air Canada
Wed, Aug 5 - Wed, Aug 19
United Airlines Logo
3:30 pm - 4:20 pm
STL
-
OTP
16h 50m
1 stop
United Airlines Logo
1:45 pm - 6:27 pm
OTP
-
STL
36h 42m
2 stops
$567United Airlines
Wed, Aug 5 - Wed, Aug 19
Air Canada Logo
12:10 pm - 12:50 pm
STL
-
OTP
16h 40m
2 stops
Air Canada Logo
6:05 am - 6:27 pm
OTP
-
STL
44h 22m
2 stops
$570Air Canada
Wed, Aug 5 - Wed, Aug 19
Delta Logo
6:29 am - 12:45 pm
STL
-
OTP
22h 16m
2 stops
Delta Logo
7:05 am - 12:25 am
OTP
-
STL
25h 20m
2 stops
$597Delta
Sun, Apr 5 - Thu, Apr 16
Delta Logo
6:29 am - 12:45 pm
STL
-
OTP
22h 16m
2 stops
Delta Logo
7:05 am - 12:25 am
OTP
-
STL
25h 20m
2 stops
$598Delta
Sun, Apr 5 - Wed, Apr 15
United Airlines Logo
8:30 am - 12:00 pm
STL
-
OTP
19h 30m
2 stops
United Airlines Logo
1:45 pm - 5:50 am
OTP
-
STL
24h 05m
2 stops
$600United Airlines
Tue, Apr 7 - Fri, Apr 17
United Airlines Logo
8:30 am - 12:00 pm
STL
-
OTP
19h 30m
2 stops
United Airlines Logo
6:15 am - 10:56 pm
OTP
-
STL
24h 41m
2 stops
$601United Airlines
Tue, Apr 7 - Wed, Apr 15
British Airways Logo
11:45 am - 2:35 pm
STL
-
OTP
18h 50m
2 stops
British Airways Logo
8:15 am - 7:33 pm
OTP
-
STL
19h 18m
2 stops
$602British Airways
Wed, Apr 8 - Wed, Apr 15
Delta Logo
3:05 pm - 5:20 pm
STL
-
OTP
18h 15m
2 stops
Delta Logo
7:05 am - 12:25 am
OTP
-
STL
25h 20m
2 stops
$603Delta
Mon, Apr 6 - Wed, Apr 15
Delta Logo
6:29 am - 12:45 pm
STL
-
OTP
22h 16m
2 stops
Delta Logo
6:00 am - 12:25 am
OTP
-
STL
26h 25m
2 stops
$604Delta
Sun, Apr 5 - Fri, Apr 17

Air Canada flights from St. Louis to Bucharest Otopeni Intl Airport

Our best Air Canada deals on St. Louis to Bucharest Otopeni Intl Airport flight tickets
Air Canada
Aug 5
STL12:10 pmLambert-St Louis
22h 25m
2 stops
OTP6:35 pmBucharest Otopeni Intl
Aug 19
OTP6:05 amBucharest Otopeni Intl
44h 22m
2 stops
STL6:27 pmLambert-St Louis
$558
Air Canada
Aug 5
STL12:10 pmLambert-St Louis
16h 40m
2 stops
OTP12:50 pmBucharest Otopeni Intl
Aug 19
OTP6:05 amBucharest Otopeni Intl
44h 22m
2 stops
STL6:27 pmLambert-St Louis
$570

Lufthansa flights from St. Louis to Bucharest Otopeni Intl Airport

Our best Lufthansa deals on St. Louis to Bucharest Otopeni Intl Airport flight tickets
Lufthansa
Aug 5
STL3:30 pmLambert-St Louis
16h 50m
1 stop
OTP4:20 pmBucharest Otopeni Intl
Aug 19
OTP6:05 amBucharest Otopeni Intl
15h 20m
1 stop
STL1:25 pmLambert-St Louis
$748
Lufthansa
Apr 7
STL3:15 pmLambert-St Louis
17h 05m
2 stops
OTP4:20 pmBucharest Otopeni Intl
Apr 15
OTP6:05 amBucharest Otopeni Intl
15h 20m
1 stop
STL1:25 pmLambert-St Louis
$788
Lufthansa
Apr 7
STL3:15 pmLambert-St Louis
17h 05m
2 stops
OTP4:20 pmBucharest Otopeni Intl
Apr 14
OTP5:15 pmBucharest Otopeni Intl
28h 10m
1 stop
STL1:25 pmLambert-St Louis
$808

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Bucharest Otopeni Intl Airport 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 26, 2026.
Use the filters below to find and compare flights from St. Louis to Bucharest Otopeni Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 8/5

12:10 pm-6:35 pm

2 stops22h 25m

Bucharest Otopeni Intl

Wed 8/19

6:05 am-6:27 pm

2 stops44h 22m

$558

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 8/5

3:30 pm-4:20 pm

1 stop16h 50m

Bucharest Otopeni Intl

Wed 8/19

1:45 pm-6:27 pm

2 stops36h 42m

$567

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 8/5

12:10 pm-12:50 pm

2 stops16h 40m

Bucharest Otopeni Intl

Wed 8/19

6:05 am-6:27 pm

2 stops44h 22m

$570

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 4/5

6:29 am-12:45 pm

2 stops22h 16m

Bucharest Otopeni Intl

Thu 4/16

7:05 am-12:25 am

2 stops25h 20m

$597

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 4/5

6:29 am-12:45 pm

2 stops22h 16m

Bucharest Otopeni Intl

Wed 4/15

7:05 am-12:25 am

2 stops25h 20m

$598

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 4/7

8:30 am-12:00 pm

2 stops19h 30m

Bucharest Otopeni Intl

Fri 4/17

1:45 pm-5:50 am

2 stops24h 05m

$600

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Tue 4/7

8:30 am-12:00 pm

2 stops19h 30m

Bucharest Otopeni Intl

Wed 4/15

6:15 am-10:56 pm

2 stops24h 41m

$601

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Wed 4/8

11:45 am-2:35 pm

2 stops18h 50m

Bucharest Otopeni Intl

Wed 4/15

8:15 am-7:33 pm

2 stops19h 18m

$602

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Mon 4/6

3:05 pm-5:20 pm

2 stops18h 15m

Bucharest Otopeni Intl

Wed 4/15

7:05 am-12:25 am

2 stops25h 20m

$603

St. LouisBucharest

STL - OTP

STLOTP

Lambert-St Louis

Sun 4/5

6:29 am-12:45 pm

2 stops22h 16m

Bucharest Otopeni Intl

Fri 4/17

6:00 am-12:25 am

2 stops26h 25m

$604

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 Otopeni Intl Airport

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 Otopeni Intl Airport flights?

You could potentially save up to 49% on your flight if you consider stops on a St. Louis to Bucharest Otopeni Intl Airport flight.

When to book flights from St. Louis to Bucharest Otopeni Intl Airport

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

Cheap St. Louis to Bucharest Otopeni Intl Airport (STL to OTP) flight deals and tips

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

Fastest flight time

16h 50m

Direct flights

None
The fastest flight from St. Louis to Bucharest Otopeni Intl Airport takes 16h 50m
There are no direct flights from St. Louis to Bucharest Otopeni Intl Airport. There are no popular flight routes from St. Louis to Bucharest Otopeni Intl Airport.
Search flight deals

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

    The straight-line distance from Lambert-St Louis to Bucharest Otopeni Intl is 5451.7 mi. In terms of flight time, this usually takes a little over 16h 50m.

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

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

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Bucharest Otopeni Intl Airport.

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

    The travel and health documents you'll need for your trip to Bucharest Otopeni Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Bucharest Otopeni Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from St. Louis to Bucharest Otopeni Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Bucharest Otopeni Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $574Free CancellationRating
7.4
9,348 reviews
Search United Airlines flights
LufthansaPriceFrom $780Free CancellationRating
6.8
7,810 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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Can I find flights from St. Louis to Bucharest with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Bucharest from St. Louis with this policy.

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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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