https://desktopapps.ryanair.com
https://desktopapps.ryanair.com/en-gb/res/stations
https://api.ryanair.com/aggregate/3/common?embedded=closures
https://api.ryanair.com/timetable/3/schedules/DUB/LGW/years/2016/months/11
https://www.ryanair.com/de/de.farefinder.json is an JSON file in which several picture paths are declared :)
https://desktopapps.ryanair.com/bg-bg/res/currencies
https://api.ryanair.com/discount/3/discounts
https://ryanair.com/ie/en.markets.json https://www.ryanair.com/content/ryanair.markets.json
https://desktopapps.ryanair.com/en-gb/checkin/checkinpassengers
https://services-api.ryanair.com/farfnd/3/oneWayFares/STN/RBA/cheapestPerDay?outboundMonthOfDate=2023-11-01
You can do a month at a time (might as well do round trip?)
https://services-api.ryanair.com/farfnd/3/roundTripFares/STN/RBA/cheapestPerDay?outboundMonthOfDate=2023-11-01&inboundMonthOfDate=2023-12-01
Seems they have v4 on the site now, with options for many of the things I wanted back then.
https://www.ryanair.com/api/farfnd/v4/roundTripFares?departureAirportIataCode=STN&outboundDepartureDateFrom=2023-11-01&market=en-gb&adultPaxCount=1&arrivalAirportIataCode=RBA&searchMode=ALL&outboundDepartureDateTo=2023-11-30&inboundDepartureDateFrom=2023-11-01&inboundDepartureDateTo=2023-12-03&outboundDepartureDaysOfWeek=THURSDAY&durationFrom=1&durationTo=7&outboundDepartureTimeFrom=00:00&outboundDepartureTimeTo=23:59&inboundDepartureTimeFrom=00:00&inboundDepartureTimeTo=23:59