Whisk together soy sauce, rice vinegar, honey, sesame oil, ginger, and garlic. Toss salmon cubes in this sauce and let sit for 5 minutes.
Remove salmon from sauce, but save the sauce. Place salmon cubes in an even layer of an air fryer tray and air fryer at 375F for 6-8 minutes depending on salmon cube size.
Pour leftover marinade into a small sauce pan. Mix 3 tbsp of water with ½ tbsp cornstarch and pour that into the sauce pan. Heat over medium-low heat until the sauce bubbles and thickens. You know the sauce is thickened when the sauce easily coats the back of a spoon and stays on it. Remove from the heat and set aside.
Toss the cooked salmon cubes in the sauce and serve or serve with the sauce on the side for dipping.
Notes
Store leftovers in an airtight container in the fridge for up to 2 days.