If you're looking for a meeting place or a good stop around ½ or halfway between Chalmette and Delacroix, you can try Contreras, LA, which is about 16 minutes southeast of Chalmette, or about 16 minutes north of Delacroix.
About ¼ or a fourth of the way, you can stop at Frances Place, LA. This is about 8 minutes southeast of Chalmette.
About ⅓ or a third of the way, you can stop at Saint Bernard, LA. This is about 11 minutes southeast of Chalmette.
About ¾ or three fourths of the way, you can stop at Wood Lake, LA. This is about half an hour southeast of Chalmette, or about 8 minutes northeast of Delacroix.
If you drive straight through without stopping at all, the total distance is 24 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 32 minutes.