Distance From St Louis Regional Airport to Henri Coandă International Airport, ALN - OTP Distance

The distance from St Louis Regional Airport (ALN) to Henri Coandă International Airport (OTP) is 5436 miles or 8748 kilometers or 4721 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Alton/St Louis ( United States ) to Bucharest ( Romania )?

A one-way nonstop (direct) flight between Alton/St Louis and Bucharest takes around 12 hours 29 minutes.

Estimated flight time from St Louis Regional Airport, Alton/St Louis, United States to Henri Coandă International Airport, Bucharest, Romania is 12 hours 29 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • ALN - OTP

Kilometers		8748 km
Statute Miles		5436 miles
Nautical Miles		4721 nm
Avg. Time of Flight		12 hours 29 minutes

St Louis Regional Airport to Henri Coandă International Airport Flight Route Map - ALN to OTP Flight Path

Location of St Louis Regional Airport & Henri Coandă International Airport is given below.
Click the map to view Alton/St Louis to Bucharest nonstop flight path and travel direction.

Click to see flight route on Google Map between Alton/St Louis, United States and Bucharest, Romania. .

Nonstop flight route between Alton/St Louis, United States and Bucharest, Romania.

Time Difference Between the Airports • ALN - OTP

Time difference between Alton/St Louis (United States) and Bucharest (Romania) is 6 Hours.
Bucharest time is 6 Hours ahead of Alton/St Louis.

Location	Local Time
Alton/St Louis (United States)	2026-03-20, 15:22:24 EDT
Bucharest (Romania)	2026-03-20, 21:22:24 EET

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

St Louis Regional Airport (ALN / KALN) Alton/St Louis, United States

Destination

Henri Coandă International Airport (OTP / LROP) Bucharest, Romania