Ryanair has announced new routes from the UK for next summer.

The airline said it will operate flights from Stansted airport to 12 new destinations, including Basle, Bordeaux and Bucharest.

The company also said it will increase frequencies on 17 routes next summer.

Other new destinations from summer 2014 include Dortmund, Lisbon, and Prague. Routes where flight frequencies will increase include Milan, Rome, Berlin, Barcelona and Dublin.

The increases are part of Ryanair's long-term agreement with Stansted's owners Manchester Airports Group (MAG). 

The new flying programme will see Ryanair offer an additional 1.3 million seats from Stansted, taking the airline's  capacity at the Essex airport  to 14.5 million passengers.

Ryanair has said it plans to increase its Stansted passenger numbers to more than 18 million a year by 2018 and then upwards to nearly 21 million passengers a year by 2023.

Airline to introduce flexible tickets for business travellers

Meanwhile Ryanair plans to introduce flexible tickets for business travellers next year in the latest change to its low-cost business model.

The move is the latest in a series of efforts by the airline to attract premium passengers in a big strategy shift announced after the company's first profit warning in a decade.

"We will be rolling out a product specifically tailored for business travellers in the first quarter of next year," Michael O'Leary told journalists in London.

Business travellers who register on the website will be allowed to change flights up to the day of travel, though the pricing structure has not been finalised.

A special package for families will also be introduced, O'Leary said.

O'Leary said the introduction of allocated seating was indirect response to easyJet, which boosted sales in recent years by adding the kind of extras that Ryanair eliminated in its rush to cut costs.

"We can learn from the bits they've done well," O'Leary said. "They were doing something right and we were missing a trick."