Distance From Caernarfon Airport to St Louis Lambert International Airport

The distance from Caernarfon Airport () to St Louis Lambert International Airport (STL) is 3994 miles or 6427 kilometers or 3468 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 Caernarfon ( United Kingdom ) to St Louis ( United States )?

A one-way nonstop (direct) flight between Caernarfon and St Louis takes around 9 hours 10 minutes.

Estimated flight time from Caernarfon Airport, Caernarfon, United Kingdom to St Louis Lambert International Airport, St Louis, United States is 9 hours 10 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 • - STL

Kilometers		6427 km
Statute Miles		3994 miles
Nautical Miles		3468 nm
Avg. Time of Flight		9 hours 10 minutes

Caernarfon Airport to St Louis Lambert International Airport Flight Route Map - to STL Flight Path

Location of Caernarfon Airport & St Louis Lambert International Airport is given below.
Click the map to view Caernarfon to St Louis nonstop flight path and travel direction.

Click to see flight route on Google Map between Caernarfon, United Kingdom and St Louis, United States. .

Nonstop flight route between Caernarfon, United Kingdom and St Louis, United States.

Time Difference Between the Airports • - STL

Time difference between Caernarfon (United Kingdom) and St Louis (United States) is 5 Hours.
St Louis time is 5 Hours behind Caernarfon.

Location	Local Time
Caernarfon (United Kingdom)	2026-04-02, 07:47:51 BST
St Louis (United States)	2026-04-02, 02:47:51 EDT

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

Caernarfon Airport ( / EGCK) Caernarfon, United Kingdom

Destination

St Louis Lambert International Airport (STL / KSTL) St Louis, United States