If you have a broken limb in a cast you should advise Ryanair of both your condition and assistance requirements (if applicable). If you are traveling with upper limbs in cast, waist and above, you will only require one seat.
If you are travelling with a full leg in cast you must purchase *3 seats* in total, per journey, to travel. This will enable the leg to be elevated during the flight and reduce swelling. If you are travelling with lower leg in plaster, below the knee only, you will only require one seat. If a plaster cast has been fitted on any limb for less than 48 hours then the cast needs to be split (the split needs to run along the entire length of the cast).
If the plaster cast been fitted for more than 48 hours there is no requirement for the cast to be split. This is applicable for both plaster of pairs and resin casts.