CDG to Gare Montparnasse

FrPeter said:

Hello pilgrims!

I am arriving in CDG, terminal 3, on Sunday 27th and heading to Gare Montparnasse

What is my chance of catching the train at 2:38 pm as my flight is scheduled to arrived at 12:10pm.

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I would allow one hour minimum to get off plane, collect baggage (or not) and through customs.

RER from CDG to St Michel and Metro to Bienvenue Montparnasse usually takes an hour plus 10 minutes to walk to TGV platform.

I've used up 2 hours and ten minutes of your time and its 1420. (THIS IS THE POINT WHERE YOU CHECK YOUR TICKET ONLY TO FIND YOUR TRAIN LEAVES AT 1428 AND NOT 1438) Don't forget you need to board the train before it starts moving. I didn't add in any time to allow for late arrival of plane or bathroom stop after you get off plane or time to get from passport check to the RER or wait time for the RER.

You might make it but I doubt it. If your plane is a few minutes late or even if you have a seat in the back of the plane ... forget it ... you'll need plan B.

Le Bus Direct allows 1:15 to make its trip from CDG to Montparnasse even if anecdotally its usually faster. They want you at the stop 10 minutes before it leaves. 1256 for 1306 (assuming CDG 2A) is the last bus that will reliably get you there by 1430. Its only going to work if the passport control is fast.

If I was you ... remake plans for 3 hours before you are clear of airport. So what if that results in 2 hours of sitting around waiting somewhere ... better that than rushing to miss your bus by two minutes.

For instance there is 1621 SNCF TGV from CDG 2 to Lourdes arriving 2327.

You might want to check with your hotel at Lourdes. Usually Hotels will hold a room to a certain time and then won't guarantee a reservation. That might be what the 2030 hold time means. Usually that means you have to inform the hotel specifically that you plan to arrive later.

Did you know Lourdes has an airport?

I, too, find your schedule too tight. And too stressful, in the best case.
Yes, as @whariwharangi proposes, check flights to Tarbes/Lourdes airport. Just remember that there are two airports in Paris.
Another option: move your hotel reservation one day.
Take the sleeper, nightly train, in Austerlitz station. You will have time enough for enjoying the afternoon in Paris, visit the Jardin des Plantes (immediate to the station), see the glorious sunset over the Seine, dine in the Quartier Latin, sleep comfortably, and arrive early in the morning at Lourdes. For practical effects, it would be almost the same that if you were arrived the previous midnight. All pieces fit together nicely, with a plus and almost zero stress.
Just an idea.