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Flight Reliability

AS 1420 · Alaska Airlines

Portland → Houston (PDX–IAH)

83
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
2 min
Average arrival delay
0.9%
Cancelled
5 min early
Median arrival delay

Based on 348 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

AS 1420 departing between 6–9 AM arrived on time 96% of the time, versus 78% between 9 AM–12 PM.

Sunday scaries are real for this one.

AS 1420 arrived on time 89% of the time on Tuesdays and just 74% on Sundays. That gap is worth planning around.

A bit behind the PDX–IAH route.

AS 1420 arrived on time 81% of the time, versus 85% across the PDX–IAH route.

Trending in the right direction.

AS 1420 arrived on time 92% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue89%(52 flights)
  • Wed80%(51 flights)
  • Thu78%(49 flights)
  • Fri76%(50 flights)
  • Sat83%(42 flights)
  • Sun74%(49 flights)
On-time by departure window
  • 6–9 AM96%(54 flights)
  • 9 AM–12 PM78%(289 flights)
On-time trend by month
97%
May

Jun 62% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202562%29
July 202584%31
August 202577%30
September 202590%30
October 202557%30
November 202571%28
December 202587%30
January 202681%26
February 202685%20
March 202689%28
April 202690%30
May 202697%31
Departures on time
88%
Diverted
0.6%
Flights flown
343
Months covered
12

Same route, other flights

Keep nerding

Based on 348 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.