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Flight Reliability

AS 2161 · Alaska Airlines

Portland → BIL (PDX–BIL)

94
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
3 min early
Average arrival delay
0.3%
Cancelled
8 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 90% of the time, against 85% between 12–3 PM.

Tuesdays have been rough.

AS 2161 arrived on time 98% of the time on Mondays and just 79% on Tuesdays. That gap is worth planning around.

Better than the Alaska Airlines network average.

AS 2161 arrived on time 90% of the time, versus 80% across the Alaska Airlines network.

It basically never cancels.

Out of 353 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon98%(51 flights)
  • Tue79%(47 flights)
  • Wed85%(46 flights)
  • Thu92%(50 flights)
  • Fri83%(52 flights)
  • Sat94%(51 flights)
  • Sun96%(53 flights)
On-time by departure window
  • 9 AM–12 PM90%(311 flights)
  • 12–3 PM85%(39 flights)
On-time trend by month
90%
May

Jun 97% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202594%31
August 202594%31
September 202573%30
October 202594%31
November 202590%29
December 202571%31
January 202696%24
February 2026100%23
March 202686%29
April 202697%30
May 202690%31
Departures on time
93%
Diverted
0.6%
Flights flown
350
Months covered
12

Keep nerding

Based on 353 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.