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Flight Reliability

AS 439 · Alaska Airlines

Houston → Seattle (IAH–SEA)

64
A Little Dicey
WanderNerd Reliability Score
65%
Arrive within 15 minutes
13 min
Average arrival delay
1.4%
Cancelled
3 min
Median arrival delay

Based on 361 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

AS 439 departing between 12–3 PM arrived on time 95% of the time, versus 57% between 6–9 PM.

Saturdays have been rough.

AS 439 arrived on time 74% of the time on Thursdays and just 54% on Saturdays. That gap is worth planning around.

Lagging the IAH–SEA route.

AS 439 arrived on time 65% of the time, versus 77% across the IAH–SEA route.

Well behind the Alaska Airlines network.

AS 439 arrived on time 65% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon65%(52 flights)
  • Tue67%(51 flights)
  • Wed69%(52 flights)
  • Thu74%(49 flights)
  • Fri62%(50 flights)
  • Sat54%(52 flights)
  • Sun61%(49 flights)
On-time by departure window
  • 12–3 PM95%(19 flights)
  • 3–6 PM93%(56 flights)
  • 6–9 PM57%(280 flights)
On-time trend by month
97%
May

Jun 39% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202539%26
July 202531%29
August 202526%31
September 202583%30
October 202574%31
November 202559%29
December 202552%31
January 202677%31
February 202671%28
March 202668%28
April 202693%30
May 202697%31
Departures on time
58%
Diverted
0.3%
Flights flown
355
Months covered
12

Same route, other flights

Keep nerding

Based on 361 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.