If you're looking for a meeting place or a good stop around ½ or halfway between Massena and Bellingham, you can try Fargo, ND, which is a little over 20 hours west of Massena, or a little over 23 hours east of Bellingham.
Other possible places to stop near the midpoint include Downer, West Fargo, Valley City, Jamestown, Medina, Dawson, Bismarck, and Mandan.
About ¼ or a fourth of the way, you can stop at Milwaukee, WI. This is about 11½ hours west of Massena.
About ⅓ or a third of the way, you can stop at Eau Claire, WI. This is about 15 hours west of Massena.
About ⅔ or two thirds of the way, you can stop at Billings, MT. This is about 29½ hours west of Massena, or almost 14 hours east of Bellingham.
About ¾ or three fourths of the way, you can stop at Bozeman, MT. This is almost 32 hours west of Massena, or about 11½ hours east of Bellingham.
If you drive straight through without stopping at all, the total distance is 2,814 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 43 hours, 24 minutes.