I don't have anything for this season, but Payton Pritchard had the highest plus/minus by a player off the bench in 2024-25, at +428.

Interpreted as:

best bench +/- by a player this season

	NAME	+/-	SEASON	TM	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF
1	Payton Pritchard P. Pritchard	+428	2024-25	BOS	77	28.1	14.0	3.8	3.3	0.9	0.2	5.0	10.5	47.2	3.2	7.8	41.1	0.9	1.1	84.1	63.8	1.3	2.5	1.0	2,166	1,079	292	257	68	14	76	113
2	Isaiah Joe I. Joe	+367	2024-25	OKC	58	20.3	9.4	2.3	1.3	0.5	0.1	3.2	7.3	44.1	2.4	5.9	41.3	0.5	0.6	80.6	61.8	0.5	1.8	0.5	1,175	544	135	75	28	3	27	79
3	Sam Merrill S. Merrill	+330	2024-25	CLE	67	19.4	6.8	2.2	1.4	0.7	0.2	2.3	5.9	39.2	1.8	5.1	35.3	0.4	0.4	96.3	56.1	0.6	1.7	0.5	1,300	454	150	96	49	12	34	116
4	Nickeil Alexander-Walker N. Alexander-Walker	+303	2024-25	MIN	72	24.1	9.0	3.1	2.6	0.6	0.4	3.2	7.2	44.4	1.6	4.3	37.6	1.1	1.4	75.7	58.0	0.6	2.4	1.1	1,737	651	220	190	41	29	82	116
5	Aaron Wiggins A. Wiggins	+288	2024-25	OKC	50	20.8	10.4	3.5	1.6	0.6	0.3	4.0	8.3	48.6	1.5	3.9	37.8	0.8	1.0	80.4	59.1	0.9	2.6	0.8	1,042	518	176	81	32	14	38	62
6	Alex Caruso A. Caruso	+286	2024-25	OKC	51	18.7	6.6	2.8	2.5	1.5	0.6	2.4	5.6	43.5	1.1	3.0	34.8	0.6	0.8	84.6	55.4	0.7	2.2	0.7	955	335	145	127	79	30	36	93
7	AJ Green	+270	2024-25	MIL	66	22.5	7.6	2.4	1.3	0.5	0.1	2.5	5.7	44.7	2.2	4.8	44.4	0.3	0.4	81.5	64.5	0.2	2.2	0.5	1,486	500	158	88	33	5	33	145
8	Caris LeVert C. LeVert	+267	2024-25	TOT	61	24.8	12.4	3.2	3.4	0.9	0.5	4.5	9.4	47.6	1.7	4.4	37.9	1.8	2.5	70.6	59.0	0.6	2.5	1.2	1,513	756	194	207	56	32	72	94
9	Luke Kornet L. Kornet	+262	2024-25	BOS	57	16.1	4.9	5.1	1.5	0.4	0.7	2.1	3.2	63.6	0.0	0.0	0.0	0.8	1.2	67.6	65.4	2.5	2.6	0.3	918	280	291	84	22	42	18	83
10	Sam Hauser S. Hauser	+261	2024-25	BOS	52	19.0	7.2	2.9	0.9	0.6	0.2	2.6	5.9	43.6	2.0	5.0	39.9	0.1	0.1	100.0	60.7	0.5	2.3	0.4	990	374	150	49	30	11	19	53
11	Ty Jerome T. Jerome	+247	2024-25	CLE	67	19.6	12.0	2.5	3.3	1.2	0.0	4.3	8.5	51.2	1.4	3.4	42.1	1.8	2.1	86.6	63.5	0.7	1.8	1.3	1,312	801	166	222	78	2	86	100
12	Kenrich Williams K. Williams	+218	2024-25	OKC	62	15.1	5.9	3.2	1.2	0.5	0.1	2.3	4.6	49.5	1.0	2.3	42.1	0.4	0.5	79.3	61.5	0.9	2.3	0.5	934	366	198	73	34	9	31	95
13	Miles McBride M. McBride	+209	2024-25	NYK	54	23.1	8.7	2.4	2.5	0.9	0.2	3.1	7.5	41.5	1.6	4.4	36.9	0.9	1.0	83.6	54.6	0.8	1.6	0.6	1,245	471	130	134	48	10	33	83
14	Naz Reid N. Reid	+205	2024-25	MIN	63	25.4	13.1	5.2	2.0	0.7	0.8	4.9	10.3	47.8	2.0	5.1	39.6	1.3	1.6	76.7	59.6	1.0	4.2	1.3	1,598	827	327	126	46	50	82	143
15	Jaylin Williams J. Williams	+194	2024-25	OKC	38	14.9	4.9	5.0	2.0	0.3	0.6	1.7	4.1	41.6	1.2	3.0	38.3	0.4	0.6	69.6	57.3	0.9	4.1	0.6	566	188	190	76	13	22	24	63
16	Georges Niang G. Niang	+170	2024-25	TOT	76	21.4	9.8	3.4	1.4	0.3	0.2	3.6	7.9	45.7	2.1	5.1	40.0	0.6	0.8	79.3	60.1	0.6	2.8	1.0	1,627	748	257	104	24	14	78	196
17	Steven Adams S. Adams	+168	2024-25	HOU	55	13.1	3.5	5.4	1.1	0.3	0.4	1.4	2.7	54.1	0.0	0.0	0.0	0.7	1.5	44.0	53.3	2.7	2.7	1.0	723	195	298	63	18	24	53	54
18	Dorian Finney-Smith D. Finney-Smith	+167	2024-25	LAL	23	26.8	7.8	3.5	1.3	1.1	0.3	2.7	6.1	43.6	2.1	4.9	42.9	0.4	0.5	90.9	62.1	1.2	2.3	0.7	616	180	80	30	25	6	17	49
19	Gui Santos G. Santos	+161	2024-25	GSW	54	13.3	4.0	2.9	1.4	0.5	0.2	1.4	3.1	45.9	0.6	1.8	32.7	0.5	0.8	70.7	57.7	1.3	1.6	0.8	719	217	158	77	25	10	42	86
20	Jabari Smith Jr. J. Smith Jr.	+153	2024-25	HOU	18	28.0	13.2	7.7	1.3	0.7	0.4	4.9	10.1	49.2	1.8	4.8	37.2	1.6	1.9	82.4	60.7	1.8	5.9	1.6	505	238	139	23	12	7	28	34
21	Cameron Payne C. Payne	+147	2024-25	NYK	67	14.1	6.6	1.3	2.6	0.5	0.2	2.4	6.0	40.0	1.2	3.4	36.1	0.6	0.6	90.5	52.7	0.2	1.2	0.6	943	441	90	175	32	15	43	103
22	Kevon Looney K. Looney	+144	2024-25	GSW	70	14.7	4.7	6.1	1.4	0.6	0.5	1.9	3.7	52.7	0.0	0.1	40.0	0.8	1.3	59.1	55.1	2.4	3.6	0.5	1,026	327	426	101	40	35	36	139
23	Cason Wallace C. Wallace	+137	2024-25	OKC	25	25.2	8.3	2.6	2.4	1.8	0.6	3.4	6.8	49.7	1.1	3.0	36.0	0.5	0.5	92.3	59.2	0.8	1.7	0.8	630	207	64	61	44	15	19	41
24	Isaac Okoro I. Okoro	+135	2024-25	CLE	33	17.0	5.6	2.2	1.0	0.5	0.2	2.1	4.7	45.2	0.8	2.6	32.6	0.5	0.7	77.3	56.2	0.8	1.4	0.4	562	185	72	32	18	7	13	60
25	Donte DiVincenzo D. DiVincenzo	+135	2024-25	MIN	52	25.2	11.1	3.6	3.5	1.1	0.3	3.9	9.3	41.7	2.7	6.9	39.1	0.7	0.9	77.8	57.5	0.4	3.1	1.5	1,311	577	186	184	59	16	78	97