Between the 1999-00 and 2019-20 seasons, the San Antonio Spurs had the highest winning percentage by a team, winning 68.8 percent of the time.

highest winning percentage nba 1999-00 to 2019-20 by a team

TEAM	W%	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
San Antonio Spurs	.688	1,695	241.6	100.7	42.9	22.5	7.3	5.5	13.7	37.9	80.9	46.8	7.3	19.3	37.7	17.6	23.3	75.5	409,500	170,651	72,786	38,219	12,378	9,385	23,224	32,340
Dallas Mavericks	.595	1,699	241.8	102.7	42.4	22.0	7.4	4.9	13.1	38.2	83.4	45.8	8.2	22.5	36.3	18.2	23.0	79.2	410,785	174,501	72,088	37,456	12,560	8,330	22,232	34,936
Houston Rockets	.573	1,696	242.0	101.8	43.1	21.2	7.7	4.8	14.9	36.9	82.0	45.0	9.2	25.9	35.5	18.9	24.9	75.8	410,415	172,711	73,148	35,972	13,025	8,172	25,330	34,933
Los Angeles Lakers	.558	1,695	241.8	102.7	44.1	22.6	7.5	5.1	14.3	38.3	83.9	45.6	7.3	21.0	34.8	18.8	25.5	73.6	409,825	174,115	74,811	38,312	12,730	8,691	24,288	35,467
Miami Heat	.555	1,697	242.1	97.7	41.6	21.1	7.4	5.1	14.2	36.6	79.6	45.9	7.1	20.0	35.8	17.4	23.6	73.8	410,805	165,779	70,597	35,832	12,553	8,716	24,139	35,461
Boston Celtics	.551	1,695	241.7	100.0	41.6	22.4	8.3	4.5	14.8	37.0	81.5	45.3	7.7	21.7	35.6	18.3	23.9	76.7	409,675	169,517	70,578	37,968	14,072	7,553	25,047	37,641
Oklahoma City Thunder	.549	1,696	241.8	102.5	43.3	21.2	7.9	5.1	14.8	38.1	83.3	45.7	7.3	20.5	35.5	19.1	24.7	77.2	410,140	173,819	73,458	36,038	13,368	8,687	25,019	36,310
Utah Jazz	.547	1,696	241.6	99.3	42.2	23.1	7.7	5.3	15.2	36.8	79.8	46.2	6.0	17.0	35.6	19.6	26.0	75.2	409,715	168,388	71,580	39,229	13,130	8,996	25,776	38,313
Indiana Pacers	.544	1,696	241.7	99.4	43.0	21.6	7.6	5.2	14.6	36.8	82.0	44.9	7.2	20.0	35.9	18.6	24.0	77.4	409,840	168,559	72,929	36,670	12,925	8,764	24,787	36,468
Portland Trail Blazers	.536	1,698	241.9	99.6	42.5	21.4	7.0	4.9	14.1	37.3	82.1	45.5	7.4	20.4	36.1	17.6	22.9	77.1	410,745	169,156	72,174	36,305	11,965	8,280	23,971	34,717
Denver Nuggets	.523	1,697	241.6	103.0	43.6	23.5	8.0	5.5	15.0	38.3	84.1	45.6	7.0	20.1	34.9	19.4	25.9	74.8	409,955	174,851	73,980	39,804	13,634	9,270	25,459	36,883
Toronto Raptors	.510	1,696	242.0	100.3	41.8	21.8	7.4	4.9	13.6	37.3	82.5	45.2	7.4	20.5	36.3	18.3	23.5	77.7	410,365	170,175	70,819	36,893	12,511	8,238	23,128	36,688
Detroit Pistons	.503	1,690	241.8	97.6	42.4	21.2	7.3	4.9	13.7	36.6	82.0	44.6	6.8	19.2	35.3	17.6	24.0	73.6	408,700	164,953	71,664	35,877	12,325	8,289	23,185	34,530
Phoenix Suns	.501	1,697	241.5	103.6	42.5	22.9	7.7	4.9	15.1	39.0	84.5	46.2	7.8	21.5	36.1	17.8	23.2	76.5	409,880	175,863	72,118	38,879	13,051	8,371	25,555	36,592
Golden State Warriors	.497	1,689	241.5	104.7	43.6	23.8	8.3	5.4	14.9	39.2	85.9	45.7	8.3	22.4	36.9	18.0	23.9	75.6	407,835	176,896	73,713	40,240	13,957	9,177	25,191	36,776
L.A. Clippers	.483	1,696	241.5	100.3	42.5	21.9	7.3	5.3	14.7	37.2	81.5	45.7	6.7	19.0	35.5	19.2	25.7	74.5	409,590	170,092	72,141	37,106	12,425	9,013	25,007	36,226
Milwaukee Bucks	.481	1,697	241.9	100.6	42.2	22.6	7.6	4.8	14.3	37.9	83.1	45.5	7.1	19.9	35.9	17.7	23.3	76.0	410,480	170,753	71,648	38,272	12,942	8,078	24,246	36,483
Cleveland Cavaliers	.475	1,689	241.7	99.1	43.0	21.6	7.2	4.6	14.6	36.9	82.3	44.9	7.1	19.8	35.9	18.2	24.3	74.7	408,310	167,386	72,582	36,424	12,224	7,763	24,678	35,170
Orlando Magic	.468	1,697	241.5	99.5	42.6	21.1	7.4	4.8	14.6	37.2	82.3	45.2	7.5	21.1	35.8	17.6	23.9	73.6	409,880	168,817	72,245	35,855	12,478	8,122	24,829	35,617
New Orleans Pelicans	.464	1,450	241.9	99.3	42.4	22.0	7.5	4.8	14.0	37.5	82.9	45.2	7.1	19.9	35.7	17.2	22.5	76.3	350,750	143,956	61,544	31,886	10,811	6,894	20,322	29,707
Philadelphia 76ers	.462	1,697	241.7	98.2	42.8	22.0	8.4	4.8	15.1	37.0	82.4	44.8	6.1	17.8	34.3	18.2	24.4	74.6	410,155	166,692	72,593	37,314	14,274	8,220	25,593	35,504
Sacramento Kings	.456	1,696	241.9	102.6	42.6	22.2	8.1	4.3	14.8	38.4	84.3	45.5	7.1	19.7	36.0	18.8	24.7	76.1	410,265	174,076	72,275	37,594	13,719	7,285	25,125	35,544
Chicago Bulls	.454	1,689	242.1	96.9	43.4	22.1	7.4	5.0	15.1	36.5	82.7	44.1	6.4	18.1	35.6	17.5	23.2	75.3	408,910	163,618	73,333	37,304	12,485	8,440	25,466	35,804
Memphis Grizzlies	.454	1,697	241.9	97.7	41.5	21.3	8.0	5.1	14.7	36.7	81.4	45.1	6.1	17.5	34.8	18.1	24.0	75.4	410,505	165,721	70,373	36,114	13,598	8,633	25,027	35,970
Atlanta Hawks	.441	1,691	241.9	98.7	41.9	22.1	7.7	4.9	15.2	37.0	82.0	45.1	7.1	20.1	35.3	17.7	23.3	75.9	409,040	166,962	70,916	37,301	13,035	8,210	25,740	35,226