Best transport from Paris to Colmar
Charter aircraft.
It would help to know what your priorities are. Are you looking for the cheapest transport, or the fastest, or the most convenient?
Generally, I would vote for the train, as it's relatively fast and comfortable in that you can enjoy several hours relaxing and watching the scenery. For timetables and prices, go to https://www.sncf-connect.com/en-en, which is the official French national railway company.
Generally train would be the 'best' for me but it depends on what constitutes 'best' to you. Train takes about 2-1/2 hrs with one change in Strasbourg.