I see the train station is just in the airport, cool, but why is it impossible to buy tickets for most trains? I tried multiple times since my order (months ago) using bahn.de, thetrainline.com, omio.com and it's still unable to provide the simplest train tickets we want :'(. Source: 10 months ago

I found this option on a website called omio.com but not sure if it is reliable or not. Source: 12 months ago

I recommend omio.com and checking train prices in cp.pt and flixbus and https://rede-expressos.pt/en/ for bus prices. Within Lisbon you will have to see what works better depending on where the bus or train takes you. Source: over 1 year ago

I would advise checking separate official websites for more accurate information, but I think omio.com has both trains and buses in their system. Source: over 1 year ago

I was trying to book some tickets from Barcelona to Madrid for a family trip in April, but somehow at the checkout time, I always got this error, it's been a day. I don't know if this is some website problem or just me. Any idea? Btw, is there a legit and good third-party site I can buy train tickets in Spain? I heard of omio.com and is it good? Thanks a lot! Source: over 1 year ago

I also found HereJS and their pricing seems good, but again I have no idea. Source: almost 3 years ago

Here has a freemium tier (no credit card required) which gives you 250k transactions per month for free. https://developer.here.com/pricing Disclaimer: I work for here. - Source: Hacker News / about 3 years ago

Here has a generous free tier. You can get routes between locations, but you can't do isochrones anymore (they killed it due to lack of interest). Source: about 3 years ago