Helsinki-Vantaa Airport, in Helsinki, Finland.

What is the difference between HEL and EFHK?

HEL is the IATA code, used commercially — tickets, timetables, luggage tags. EFHK is the ICAO code, used operationally by pilots and air traffic control, and assigned geographically by region.

What airport is HEL?

HEL is

Helsinki-Vantaa Airport

Helsinki, Finland

Why the code is HEL

The first three letters of Helsinki.

The airport authority or a contemporaneous record states this directly.

The airport

IATA code: HEL
ICAO code: EFHK
Airport: Helsinki-Vantaa Airport
City: Helsinki, Finland
Code origin: Documented

Helsinki built an entire business model on being the shortest hop between Europe and north-east Asia over the pole. Russian airspace closures in 2022 removed that advantage almost overnight, which is a rare example of geography-based aviation strategy being undone by politics.

The other code, EFHK

Every airport has two codes. The three-letter IATA code, HEL, is the one on your boarding pass and your luggage tag, and it is assigned for commercial use. The four-letter ICAO code, EFHK, is the one pilots and controllers use, and it is assigned geographically: the first letter or two identify the region, so every airport in the same part of the world shares a prefix. That is why EFHK looks nothing like HEL.

Common questions

What airport is HEL?: Helsinki-Vantaa Airport, in Helsinki, Finland.
Why is Helsinki's airport called HEL?: The first three letters of Helsinki.
What is the difference between HEL and EFHK?: HEL is the IATA code, used commercially — tickets, timetables, luggage tags. EFHK is the ICAO code, used operationally by pilots and air traffic control, and assigned geographically by region.

Finland Capital, area, population and currency
The flag of Finland Colours, symbols and lookalikes
Airport codes in Finland 1 here

Sources

OurAirports — OurAirports (Public domain)

How these figures are compiled and checked