Looking for advice to train from Paris to Bruges-one way in May.
If you look on the SNCF website (and download the app) probably the more cost effective trip would be Paris > Lille, then Lille>Bruges. (There's two stations next to each other in Lille; so you want to know which one you are coming into and which one you are departing out of.) We departed from Lille to Ghent and it was easy enough.
You could also take the Eurostar from Paris > Brussels, then the regional train to Bruges.
You can go with the inOui TGV to Lille and change there from Lille Europe to Lille Flanders for the local train to Bruges. Between the two stations in Lille you have to walk around 10 minutes. In Kortrijk in Belgium, announced as Courtrai in Lille, you have to change again for the final leg to Bruges. The Eurostar is an option too, with a change in Brussels, however running more frequent is in most cases much more expensive, while taking almost the same time.
For my recent trip from Belgium to Paris I used the website for international trains of the national carrier NMBS / SNCB, for buying the tickets.