Further closures to air routes may come in the next 48 hours, possibly without notice, the Foreign and Commonwealth Office warns.
Britons who are currently travelling abroad are being urged to return to the UK now.
A statement from the Foreign and Commonwealth Office (FCO) said tourists and short-stay travellers should come home while commercial flights remain available.
Foreign secretary Dominic Raab said: “Around the world, more airlines are suspending flights and more airports are closing, some without any notice.
“Where commercial routes don’t exist, our staff are working round the clock to give advice and support to UK nationals. If you are on holiday abroad the time to come home is now while you still can.”
The FCO statement added: “Today’s update reflects the pace at which international travel is becoming more difficult with the closure of borders, airlines suspending flights, airports closing, exit bans and further restrictions being introduced daily.”
The government has has called for international action to keep air routes open for a sufficient period of time to enable international travellers to return on commercial flights.
However, some British tourists abroad have already experienced difficulty returning to the UK because of restrictions.