The offer includes departures from Faro, Lisbon, Porto and Madeira, with some of the lowest fares available to travellers leaving from the Algarve.

From Faro Airport, passengers can find one-way flights from €14.99 to destinations including Madrid, Marrakesh, Paris, Porto, Toulouse and Bournemouth. Other options include Norwich from €19.99, Marseille from €20.99 and Teesside from €24.99.

Travellers departing from Lisbon also have several destinations available for less than €20. Flights to Málaga, Seville, Tangier and Valencia start at €14.99, while Agadir and Marrakesh are available from €16.99. Fares to Madrid start at €17.44, with Alicante, Barcelona and Madeira from €19.99.

The widest choice is available from Porto, where the airline's autumn offer covers dozens of destinations. Among the cheapest are Ibiza, Palma de Mallorca and Rabat from €14.99. Liverpool starts at €15.99, while Bristol and Marseille can be found from €16.99.

Those looking for an autumn city break can also find flights from Porto to Milan from €17.49, Brussels from €23.99 and Paris from €24.99.

There are fewer options from Madeira, but discounted fares are also available. Flights to Shannon start at €21.99, Porto at €23.58, Edinburgh at €24.99 and Manchester at €30.49.

The promotion covers selected routes and dates, meaning the lowest fares may not be available on every departure. Ryanair's promotional conditions also state that offers are subject to availability.

Bookings under the campaign can be made until 30 September, for travel until 30 November.