When and where from?

With Deutschlandticket you can use all local trains (S-Bahn, RB, RE, MEX and other local trains), you need to get to France by local train and pay from the border to Paris or you pay a Ticket like from the last station in Germany to Paris for a TGV or ICE.

Which is the last station in Germany to Paris ?

and how much is the ticket to Paris 

When and from where in Germany?

I would be in Colon but I gonna have the Deutschlandticket so I want the cheapest way and It will be from July 25 to July 30

Is that Cologne (Köln)?

Are you already 26 or older? (That can make a difference).

Here is what I've found for now :

- Köln/Cologne - Koblenz - Saarbrücken 07:32 - 11:41

- RE/TER Saarbrücken - Forbach 12:21 - 12:31 4.80€

- (same train) RE/TER Forbach - Metz 12:33 - 13:20

- Ouigo Metz - Paris-Est 13:52 - 15:17 24€

You need to make 2 bookings on sncf-connect.com. 28.80€ total is very cheap frankly.

Return :

- Ouigo Paris-Est - Strasbourg 10:08 - 11:54 35€

- TER Strasbourg - Kehl 12:50 - 13:01 4€

- (same train) Kehl - Appenweier - Karlsruhe - Mannheim - Mainz - Köln 13:03 - 20:02 or 20:28

Option 2 :

- departure 07:58, 49€ 2nd class or 54€ 1st class, arrival about an hour earlier in Cologne

Total : 28.80€ + 39€ = 67.80€. Would that be ok ?

Other option: via Luxembourg. (Prices corrected for age.)

There are currently cheap tickets Luxembourg - Paris available on 25 July:

Köln Hbf 7:32 - Luxembourg 11:22 or Köln Hbf 8:32 - Luxembourg 12:23 (free of charge)

Luxembourg 12:39 - Paris Est 15:17 €26.20 (book on www.sncf-connect.com)

Luxembourg 19:39 - Paris Est 22:31 is also €26.20

Return on 30 July is not very cheap via Luxembourg (currently from €51.80).

I am 19 years old 

Okay then Luxembourg - Paris would cost 2€ less than above but no other differences as far as I could see.

There would be Flixbuses for about the same price but they're not faster so I don't see an advantage.