What is the minimum number of runways required for an International Airport to be operational - commercial aviation?
Would two runways suffice?
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Instead of just looking at the minimum number of runways, I though it would be interesting to have a look at the overall statistics for the number of runways. So I went through my navigation database (AIRAC 2111) and filtered for international airports based on Wikipedia's list. The following histogram shows the number of runways for the 1356 international airports in my database (click image for higher resolution):
As you can see, most international airports (921) actually only have a single runway. The following plot shows the same histogram with a logarithmic y-axis:
About 2/3 international airports only have a single runway. Less than 1% have more than 4.
Many international airports have only one landing strip, because this is not possible or not justified to build and maintain more.
International strictly refers to customs services availability
For aviation matters, including in the US, an international airport is an airport which can be used for international flights, as opposed to domestic flights only. International flights are flights crossing the State borders.
Accordingly an international airport is one which can deal with customs and quarantine matters for arriving and departing persons and shipments.
So to answer your question briefly, an international airport:
Formal definitions for international airport are detailed below if you are interested.
ICAO is the UN body facilitating civil aviation across borders. State regulators usually subscribe to ICAO work. ICAO definition of an international airport:
Any airport designated by an ICAO Contracting State in whose territory it is situated as an airport of entry and departure for international air traffic, where the formalities such as customs, immigration, public health, agricultural quarantine and similar procedures are carried out.
Source ICAO glossary
FAA subscribes to ICAO definition, adding details:
Relating to international flight, it means:
- An airport of entry which has been designated by the Secretary of Treasury or Commissioner of Customs as an international airport for customs service.
- A landing rights airport at which specific permission to land must be obtained from customs authorities in advance of contemplated use.
- Airports designated under the Convention on International Civil Aviation as an airport for use by international commercial air transport and/or international general aviation.
(See ICAO term INTERNATIONAL AIRPORT.)
Source: FAA Pilot/Controller glossary
International airports typology
Many international airports are located on touristic islands and most of them have only one landing strip (which can be used in one or both direction, creating one or two runways).
Princess Juliana International Airport (TNCM) is a good example of such medium sized airport with customs and only one landing strip:
KLM Boeing 747 taking off from TNCM, source
Another element for promoting an airport to international status has been mentioned by @rtaft in a comment:
There are many small international airports along the US Canadian border that only deal with small aircraft flights between the two countries, as well as some along the Mexican border for Mexican flights.
The number of runways is more a matter of prevalent winds over the year and landing/takeoff frequency.
In Germany, Lufthansa (the German flagship airline) and Deutsche Bahn (German railways) have a cooperation, where some Deutsche Bahn trains also have a Lufthansa flight number and Lufthansa sells airline tickets for those trains. As a result, some German train stations have an IATA airport code. And at last at some of them, I believe you can have your luggage checked through all the way onto the train and go through customs at the arrival train station.
So, that would technically be an International Airport with zero runways and no aircraft movements.
Serious answer: one, Bianfable is correct.
Slightly less serious answer: zero. In principle, there are scheduled flights from CHX (Vancouver Harbour) or YWH (Victoria Harbour) to LKE (Seattle Lake Union), all three of which of which solely operate seaplanes and have no "runways" in the normal sense of the word.
(I say "in principle": it appears that at the time of writing the scheduled routes have been suspended. But that will presumably lift, eventually.)
There are a few other Canadian airports with only seaplane facilities that are classed as ports of entry by the Canadian authorities, and thus could in principle have international travel, eg Whitehorse or Seal Cove, but Victoria & Vancouver Harbours seem to be the only two pure-seaplane sites with a (normally) scheduled service.
San Diego International Airport (SAN), in San Diego, CA is one of the world's busiest single runway airports. Interestingly, Montgomery-Gibbs Executive Airport, also located in San Diego, is not an international airport, and has 3 runways. It is one of the world's busiest GA airports.
So, 1 runway would be the minimum for an international airport.
Ketchikan International Airport in the State of Alaska, USA has one runway.
Consider London airports:
They are all international airports. Gatwick is consistently in the top 15 airports ranked by international passenger traffic.