Direct answer: The countries commonly cited as having no airport within their borders are Vatican City, Monaco, San Marino, Liechtenstein, and Andorra. These small or landlocked states rely on nearby international airports in neighboring countries or nearby cities for air travel, with arrivals typically occurring by road, rail, or boat from those hubs.

Details by country

• Vatican City: No airport of its own; arrivals are via Rome’s airports, with a short transfer to the city.

• Monaco: No airport; access is typically via Nice Côte d’Azur Airport in France or by heliport/sea access for ultra-brief transfers.

• San Marino: No regular airport; nearest options are airports in Bologna or Rimini, followed by a road transfer.

• Liechtenstein: No airport within its borders; travelers fly into nearby Switzerland or Austria and continue by train or car.

• Andorra: No airport; closest major airports are in Barcelona, Toulouse, or sometimes Perpignan, with a long drive or bus ride through the Pyrenees.

Notes

• Several lists and travel sources mention these five as the primary examples of countries without airports, often highlighting how proximity to larger international hubs makes air travel unnecessary within the country itself.

• Some sources also include Vatican City as the smallest sovereign state with no airport, using the nearby Italian airports and heliports for official visits.

If you’d like, I can verify the latest status or provide travel routes and typical travel times from the nearest airports for each country.