78% of flights arrived on time in May 2026, and 0.9% were cancelled. Delta Air Lines was the most punctual airline (81%); Spirit Airlines was the least (59%). The most delayed busy route was BUR → SFO (30% on time).

Airlines

#	Airline	Flights	On time	Year earlier	Cancelled
1	Delta Air Lines	146,238	81%	78%	1.1%
2	Alaska Airlines	44,087	81%	78%	0.8%
3	JetBlue	19,806	81%	73%	0.2%
4	United Airlines	136,159	79%	76%	0.7%
5	American Airlines	180,925	78%	72%	1.5%
6	Frontier Airlines	18,423	76%	69%	0.5%
7	Allegiant Air	10,570	73%	76%	0.1%
8	Southwest Airlines	120,646	72%	76%	0.4%
9	Spirit Airlines	354	59%	74%	14.1%

Most delayed routes

Route	Flights	On time
BUR → SFO	289	30%
PSP → SFO	220	31%
SNA → SFO	413	38%
RNO → SFO	170	40%
SAN → SFO	619	40%
LAS → SFO	534	40%
SEA → SFO	591	40%
BOI → SFO	165	42%
MSP → SFO	169	42%
ONT → SFO	127	43%
LAX → SFO	1040	44%
PHX → SFO	418	45%
SBA → SFO	151	45%
SLC → SFO	307	46%
DFW → SFO	401	47%
LAX → DAL	131	47%
PDX → SFO	299	47%
DAL → LGA	145	49%
SFO → SAN	608	53%
AUS → SFO	253	53%

Most reliable routes

Route	Flights	On time
PDX → SNA	124	98%
BOI → SLC	155	96%
GEG → SLC	149	95%
OGG → SFO	145	95%
PDX → MSP	142	95%
BOI → LAX	150	95%
DLH → MSP	124	94%
BOS → MSP	155	94%
LYH → CLT	179	94%
ALB → BWI	154	94%
SAN → EWR	135	93%
ANC → SEA	596	93%
SGU → SLC	163	93%
FAR → MSP	148	93%
CVG → EWR	176	93%
MSP → EWR	207	93%
SNA → PDX	124	93%
ANC → PDX	148	93%
SLC → DTW	148	93%
MKE → MSP	174	93%

Airports

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

#	Airport	Departures	On time	Cancelled
1	EWR Newark	11,117	85%	1.0%
2	SLC Salt Lake City	10,248	85%	0.4%
3	PDX Portland	6,609	84%	0.4%
4	PIT Pittsburgh	4,027	84%	0.8%
5	CLE Cleveland Hopkins	4,086	83%	1.0%
6	IAD Washington Dulles	8,322	82%	0.8%
7	CMH John Glenn Columbus	4,047	82%	1.3%
8	MSP Minneapolis-St. Paul	11,372	82%	0.5%
9	SEA Seattle-Tacoma	16,359	82%	0.4%
10	HNL Honolulu	4,953	82%	1.1%
11	IND Indianapolis	4,681	82%	0.9%
12	SMF Sacramento	5,062	81%	0.4%
13	PHL Philadelphia	11,572	81%	1.0%
14	CVG Cincinnati Northern Kentucky	3,893	81%	1.0%
15	SJC San Jose	3,851	81%	0.4%
16	JFK New York JFK	10,443	81%	1.4%
17	SNA Orange County John Wayne	3,897	80%	0.8%
18	SAT San Antonio	3,552	80%	1.4%
19	LAX Los Angeles LAX	16,450	79%	0.5%
20	RDU Raleigh-Durham	5,607	79%	1.1%
21	DTW Detroit Metro	12,093	79%	1.2%
22	BOS Boston Logan	12,694	79%	0.6%
23	CLT Charlotte Douglas	20,555	78%	0.3%
24	MCI Kansas City	4,558	78%	1.1%
25	IAH Houston Bush Intercontinental	14,646	78%	0.6%
26	MCO Orlando	12,963	78%	0.7%
27	PHX Phoenix Sky Harbor	17,420	77%	0.3%
28	STL St. Louis Lambert	5,863	76%	0.9%
29	BWI Baltimore/Washington	8,167	76%	0.3%
30	TPA Tampa	6,471	76%	0.7%
31	DEN Denver	27,406	76%	0.3%
32	ATL Atlanta Hartsfield-Jackson	30,772	76%	1.1%
33	SAN San Diego	9,587	75%	0.8%
34	MIA Miami	9,296	75%	0.4%
35	ORD Chicago O'Hare	36,646	75%	1.1%
36	AUS Austin-Bergstrom	7,944	74%	0.9%
37	FLL Fort Lauderdale	6,437	74%	0.5%
38	MDW Chicago Midway	6,437	74%	0.3%
39	DCA Washington Reagan National	12,600	74%	1.5%
40	LAS Las Vegas Harry Reid	14,724	73%	0.7%
41	LGA LaGuardia	14,095	73%	2.0%
42	MSY New Orleans	4,212	73%	0.8%
43	HOU Houston Hobby	4,533	71%	0.8%
44	BNA Nashville	10,138	70%	0.7%
45	DFW Dallas/Fort Worth	27,441	70%	3.3%
46	SFO San Francisco	13,318	69%	0.9%
47	DAL Dallas Love Field	6,141	63%	1.7%

Routes need 120+ flights in the month to be ranked (1,897 were). Figures as published by BTS; frozen 2026-08. Method.

May 2026 report

Airlines

Most delayed routes

Most reliable routes

Airports