ON TIMEBOARD
SDF Louisville / PHX Phoenix

SDF → PHX on time

Louisville Muhammad Ali (Louisville, KY) to Phoenix Sky Harbor (Phoenix, AZ). Every scheduled flight, September 2025 to August 2026.

On time
82%
arrived < 15 min late
Cancelled
1.1%
369 flights
Typical arrival
−8 min
median vs schedule
When late
+48 min
average delay
Flights / day
1
2 airlines

82% of flights from Louisville to Phoenix arrived on time over the past 12 months. That is better than the typical U.S. route. 5% of flights arrived more than an hour late or not at all.

How late?

The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SDF → PHX: when a flight was late, it was under 45 minutes late 65% of the time. About 1 in 28 flights landed an hour or more late, and 1 in 185 three hours or more; 1.1% were cancelled outright.

Share of all 369 scheduled flights, past 12 months, by arrival time against schedule.

By airline

AirlineFlightsOn timeCancelledTypical arrival1h+ lateAvg when lateOperated by
Southwest Airlines36683%1.1%−8 min3.6%+48 minSouthwest Airlines
American Airlines3—————American Airlines

Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.

Best time of day to fly

On-time rate by scheduled departure hour (local time at SDF). Delays build through the day as late planes knock on, so early flights usually do best.

40%70%100%6 a.m. departures: too few flights (23 flights)6a7 a.m. departures: too few flights (34 flights)7a8 a.m. departures: too few flights (18 flights)8a9 a.m. departures: too few flights9a10 a.m. departures: too few flights (24 flights)10a11 a.m. departures: too few flights (36 flights)11anoon departures: too few flights (82 flights)12p1 p.m. departures: too few flights (5 flights)1p2 p.m. departures: too few flights (20 flights)2p3 p.m. departures: too few flights (6 flights)3p4 p.m. departures: too few flights (15 flights)4p5 p.m. departures: too few flights (75 flights)5p
SDF → PHX, share of flights arriving on time, by departure hour. Hours with under 100 flights are greyed out.
82%+ on time76–82%68–76%under 68%too few flights

By month

Each calendar month pooled over 2023–2026. Best: March (77%). Worst: May (73%).

40%70%100%Jan: too few flights (93 flights)JanFeb: too few flights (85 flights)FebMar: 77% on time (105 flights)77MarApr: too few flights (94 flights)AprMay: 73% on time (105 flights)73MayJun: too few flights (90 flights)JunJul: too few flights (93 flights)JulAug: too few flights (88 flights)AugSep: too few flights (87 flights)SepOct: too few flights (97 flights)OctNov: too few flights (87 flights)NovDec: too few flights (93 flights)Dec

By day of week

DayFlightsOn timeCancelled
Monday53——
Tuesday52——
Wednesday52——
Thursday52——
Friday53——
Saturday53——
Sunday54——

Why flights were late

Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.

Late inbound plane 44%Airline (crew, maintenance, ops) 30%Air traffic & airport (NAS) 22%Severe weather 4%

Cancellations: weather 2 · airline 1 · air traffic/airport 1

Month by month

Not enough months with data to draw a trend.

Worst days in the past year

DateFlightsOn timeCancelled
May 3, 202630%0

Questions

How often are flights from SDF to PHX on time?

82% of 369 scheduled flights from Louisville, KY to Phoenix, AZ arrived within 15 minutes of schedule between September 2025 and August 2026. 1.1% were cancelled.

What month has the most delays from SDF to PHX?

May (73% on time). The best month is March (77%), over 2023–2026.

Related

Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.