First time I flew into Paris. Stayed a night. TGV train to Bayonne then train to St Jean.
All worked great.
Qantas/Emirates via Dubai
Came back Santiago to Madrid, Bangkok, Sydney.
Second time. In and out of Madrid. But we only started at Sarria. Train up to start point.
Back via lots of places....... we tend not to just go to walk the Camino.
This year. Sydney, Bangkok, Paris return using Thai Airways. Thai Airways are good.
We'll train down from Paris.
I would then plan to fly from Santiago to Paris if returning right away.
But we're heading off to a few other places, ending back in Paris to fly home.
So in summary.
If you are just flying in and out for the Camino, Paris or Madrid both work well.
My preference? maybe Paris.
You get to see another country....and who doesn't love Paris.
I would train down to St Jean and fly back from Santiago to Paris.
When flying in to Paris I stay close to Gare Montparnasse.
The TGV leaves from there to Bayonne.
(some people take the TGV direct from CDG Airport)
I like to have a night to get over jet lag and there are some great places to eat near the station !
I stay at Best Western Bretagne Montparnasse, as there are great places to eat in that road and a creperie right across the street!
Lots of options around there for accomodation though.
Buen Camino.