what are the best cushioned running shoes for long distance

If your priority is maximum comfort over long runs (10+ miles, half marathon, marathon training), these are among the strongest choices available today. They balance cushioning, durability, and ride quality better than simply choosing the softest shoe.
Runner's World
+1

Best overall for most runners
Nike Vomero 18
$155.00
•
Nike

The Vomero 18 is one of the best all-around long-run shoes. It combines a very soft ride with enough responsiveness that it doesn't feel sluggish after several miles. If you're looking for one shoe to handle daily training and long runs, it's an excellent choice.
Runner's World
+1

Other top picks
Brooks Glycerin Max 2
$200.00 · Brooks Running

Ideal if you want an exceptionally plush, smooth ride. Great for recovery runs and marathon training when comfort matters more than speed.

ASICS GEL-Nimbus 28
$169.99 · DICK’S Sporting Goods

One of the softest neutral trainers available. Excellent shock absorption and a favorite for runners logging high weekly mileage.

HOKA Bondi 9
$165.00 · REI Co-op

Maximum cushioning with a stable platform. A great option for heavier runners or anyone wanting to reduce impact.

On Cloudsurfer Max
$179.99 · DICK’S Sporting Goods

Smooth, highly cushioned ride that feels lighter than many other max-cushion shoes.

If you want more bounce than softness

ASICS Superblast 3 – One of the best long-run shoes if you like a lively, energetic ride rather than a marshmallow-soft feel. Many reviewers consider it among the top marathon training shoes available.
RTINGS.com
+1

Quick recommendations by runner type
If you... Best choice
Want the softest ride Brooks Glycerin Max 2
Want the best all-around long-run shoe Nike Vomero 18
Want maximum impact protection HOKA Bondi 9
Want plush cushioning with a traditional feel ASICS GEL-Nimbus 28
Want a lighter, faster long-run shoe ASICS Superblast 3
My picks

Best overall: Nike Vomero 18

Best luxury cushion: Brooks Glycerin Max 2

Best value: HOKA Clifton (if you don't need maximum cushioning)

Best for marathon training: ASICS Superblast 3

Best for recovery runs: HOKA Bondi 9

If you tell me:

your weight,

whether you have neutral feet or overpronate,

and your typical long run distance (10K, half marathon, marathon, or ultramarathon),

I can narrow it down to the two or three shoes that will likely work best for you.