73% of flights arrived on time in May 2024, and 1.4% were cancelled. Delta Air Lines was the most punctual airline (80%); Frontier Airlines was the least (64%). The most delayed busy route was CLT → SFO (25% on time).

Airlines

#	Airline	Flights	On time	Year earlier	Cancelled
1	Delta Air Lines	132,595	80%	—	0.4%
2	Allegiant Air	9,567	79%	—	0.4%
3	Alaska Airlines	35,071	78%	—	0.4%
4	Hawaiian Airlines	6,652	77%	—	2.5%
5	JetBlue	21,246	74%	—	0.5%
6	United Airlines	113,997	73%	—	2.0%
7	Spirit Airlines	23,298	72%	—	1.1%
8	Southwest Airlines	122,496	71%	—	0.7%
9	American Airlines	165,859	66%	—	2.7%
10	Frontier Airlines	18,647	64%	—	2.6%

Most delayed routes

Route	Flights	On time
CLT → SFO	150	25%
DFW → FAT	140	27%
SJU → PHL	129	36%
DFW → SFO	340	38%
DFW → MFE	216	40%
CLT → SAT	124	40%
CLT → DFW	359	42%
PNS → DFW	178	43%
IAH → DFW	618	43%
DFW → ABQ	212	44%
CLT → LAX	247	44%
EYW → CLT	129	44%
BNA → DFW	350	45%
DFW → SAT	345	45%
CLT → SAN	151	45%
DFW → CVG	186	45%
CLT → SGF	121	45%
DFW → TUS	187	45%
DFW → PHX	473	46%
MEM → DFW	221	46%

Most reliable routes

Route	Flights	On time
FLG → PHX	124	96%
RNO → LAX	217	94%
FAI → ANC	234	93%
SLC → MSP	141	93%
MSP → SLC	141	92%
PSP → PHX	153	92%
SJC → HNL	124	92%
EUG → SEA	233	91%
LAX → ELP	128	91%
OAK → LGB	150	91%
CHS → EWR	124	91%
MYR → ATL	123	91%
BOI → PDX	162	91%
PDX → SLC	215	91%
PDX → MSP	147	90%
SAN → IAD	146	90%
SNA → SMF	187	90%
CMH → IAD	124	90%
GEG → PDX	155	90%
HNL → LAS	155	90%

Airports

Airports with at least 3,000 departures in the month, most punctual first.

#	Airport	Departures	On time	Cancelled
1	SJC San Jose	4,257	84%	0.4%
2	OAK Oakland	3,690	82%	0.4%
3	PDX Portland	6,066	82%	0.7%
4	SMF Sacramento	4,769	82%	0.5%
5	SLC Salt Lake City	9,651	81%	0.5%
6	HNL Honolulu	5,232	81%	1.7%
7	MSP Minneapolis-St. Paul	10,955	80%	0.4%
8	SNA Orange County John Wayne	3,761	79%	1.3%
9	IAD Washington Dulles	6,826	79%	0.5%
10	CMH John Glenn Columbus	3,728	78%	1.1%
11	DTW Detroit Metro	11,420	78%	0.5%
12	CLE Cleveland Hopkins	3,859	78%	1.4%
13	SEA Seattle-Tacoma	16,244	78%	0.4%
14	IND Indianapolis	4,165	77%	1.2%
15	BOS Boston Logan	12,798	77%	0.7%
16	LGA LaGuardia	14,099	77%	1.6%
17	PIT Pittsburgh	3,936	77%	1.2%
18	SAN San Diego	8,110	77%	0.9%
19	JFK New York JFK	10,627	76%	0.8%
20	LAX Los Angeles LAX	16,773	76%	0.6%
21	CVG Cincinnati Northern Kentucky	3,911	76%	1.3%
22	PHX Phoenix Sky Harbor	16,841	76%	0.7%
23	PHL Philadelphia	10,533	76%	0.7%
24	LAS Las Vegas Harry Reid	16,444	75%	0.7%
25	MCI Kansas City	4,478	75%	1.4%
26	EWR Newark	12,578	75%	1.3%
27	SFO San Francisco	11,130	75%	0.9%
28	SAT San Antonio	3,640	73%	2.5%
29	DCA Washington Reagan National	12,266	72%	0.9%
30	RDU Raleigh-Durham	5,574	72%	1.1%
31	SJU San Juan	3,104	72%	0.9%
32	ATL Atlanta Hartsfield-Jackson	29,975	72%	0.6%
33	DEN Denver	26,962	72%	0.8%
34	STL St. Louis Lambert	5,905	70%	0.9%
35	TPA Tampa	6,846	70%	1.1%
36	BNA Nashville	8,834	70%	0.9%
37	FLL Fort Lauderdale	7,892	70%	0.9%
38	MCO Orlando	13,837	69%	0.9%
39	MSY New Orleans	4,547	68%	1.6%
40	BWI Baltimore/Washington	8,683	68%	0.6%
41	MDW Chicago Midway	6,973	66%	0.7%
42	ORD Chicago O'Hare	27,923	65%	1.7%
43	MIA Miami	9,503	65%	1.0%
44	HOU Houston Hobby	5,010	65%	2.5%
45	AUS Austin-Bergstrom	7,939	64%	1.7%
46	CLT Charlotte Douglas	22,330	62%	1.3%
47	DAL Dallas Love Field	6,207	61%	3.2%
48	IAH Houston Bush Intercontinental	14,507	60%	5.1%
49	DFW Dallas/Fort Worth	27,306	54%	6.4%

Routes need 120+ flights in the month to be ranked (1,820 were). Figures as published by BTS; frozen 2026-08. Method.

May 2024 report

Airlines

Most delayed routes

Most reliable routes

Airports