Latest arrival OTP
93.5%
+3.2 points year over year
Latest departure OTP
98.4%
+9.7 points year over year
National arrival rank
#10
of 347 airports · +15.9 pts vs. national avg
12-month average
91.9%
Arrival OTP · departures 92.7%

Historical On-Time Performance

Monthly arrival and departure performance, with trailing 12-month averages.

Seasonal Arrival Pattern

Average arrival OTP by calendar month across the loaded history.

Historical Records

MeasureResult
Best monthSep 2025 · 98.3%
Weakest monthJan 2023 · 71.0%
Longest improvement streak3 month-to-month gains
Longest decline streak4 month-to-month declines
Latest reported operations124

Latest 12 Months

Newest month appears first.

MonthArr.Dep.ArrivalsDepartures
May 202693.5%98.4%6262
Apr 202686.7%95.0%6060
Mar 202687.1%91.9%6262
Feb 202691.1%91.1%5656
Jan 202690.3%87.1%6262
Dec 202590.3%85.5%6262
Nov 202596.7%91.7%6060
Oct 202596.8%95.2%6262
Sep 202598.3%98.3%6060
Aug 202588.5%91.8%6161
Jul 202591.9%93.5%6262
Jun 202591.7%93.3%6060
Flightline Intel readout: Lewiston recorded 93.5 percent on-time arrivals and 98.4 percent on-time departures in May 2026. Its trailing 12-month arrival average stands at 91.9 percent. The strongest month in the current record was Sep 2025 at 98.3 percent, while the weakest was Jan 2023 at 71.0 percent.