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Flight Reliability

AS 2255 · Alaska Airlines

Missoula → Portland (MSO–PDX)88% of its flights flew this route. The rest (PDX–PHX, PDX–SMF) are included in these numbers.

100
Nerd Approved
WanderNerd Reliability Score
97%
Arrive within 15 minutes
11 min early
Average arrival delay
0.9%
Cancelled
15 min early
Median arrival delay

Based on 232 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 100% of the time, against 96% between 3–6 PM.

Friday is doing you no favors.

AS 2255 arrived on time 100% of the time on Thursdays. On Fridays: 91%.

A bit ahead of the MSO–PDX route.

AS 2255 arrived on time 97% of the time, versus 91% across the MSO–PDX route.

Well ahead of the Alaska Airlines network.

AS 2255 arrived on time 97% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon97%(35 flights)
  • Tue94%(34 flights)
  • Wed93%(30 flights)
  • Thu100%(32 flights)
  • Fri91%(32 flights)
  • Sat100%(37 flights)
  • Sun100%(30 flights)
On-time by departure window
  • 3–6 AM96%(185 flights)
  • 6–9 AM100%(18 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM96%(24 flights)
On-time trend by month
100%
May

Jun 100% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 2025100%31
August 202597%31
September 2025100%24
October 202596%27
November 202596%28
December 202589%26
May 2026100%15
Departures on time
97%
Diverted
0%
Flights flown
230
Months covered
11

Same route, other flights

Keep nerding

Based on 232 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.