I'll be visiting Paris during spring break and during the middle (March 15) of my week long stay I wanted to take a train to Brussels and spend a night there. I read that the best way to get a cheap price on a train ticket is to book as early as possible which is usually 3 months ahead. I've been scouting https://www.thalys.com/fr/en and https://en.oui.sncf/en/ since the beginning of December but the latest... Source: over 2 years ago

For trip planning in France you can use trainline or the SNCF has also their website in English https://en.oui.sncf/en. Source: over 2 years ago

I advise you to look at the site oui.sncf (available in several languages), it's the best to see the possible routes in France. Source: almost 3 years ago

There are direct trains from the airport to Grenoble: you can check the schedules and book a ticket in advance from https://en.oui.sncf/en/. Keep in mind the airport station is "Lyon Saint-Exupéry". Source: over 3 years ago

Or use Öffi, which provides operator-independent connection (and often even realtime information) data and basically everything (except of ticket purchasing) that's needed to get around using public transport. Source: about 1 year ago

Offi (version 12.1.4-aosp): King of public transit planning! Source: over 1 year ago

I can only recommend Öffi (or ÖPNV Navigator on iOS. Source: almost 2 years ago

Offi (version 12.0.16-aosp): King of public transit planning! Source: over 2 years ago

I find the third-party app Öffi to have a far superior UX than any official app and it attempts to support as many transportation systems (mainly in German-speaking countries) as possible. That's just for route planning/departures/maps though. In the VBB area it can tell you which ticket to buy, but you can't buy it through the app (you need to use official apps or the vending machines for this). Source: over 2 years ago