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Flight Reliability

AS 188 · Alaska Airlines

Anchorage → Seattle (ANC–SEA)100% of its flights flew this route. The rest (LAS–SEA) are included in these numbers.

99
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
7 min early
Average arrival delay
0.4%
Cancelled
11 min early
Median arrival delay

Based on 237 historical flights. Data through May 2026.

What the data says

The 12–3 AM departure wins.

AS 188 departing between 12–3 AM arrived on time 97% of the time, versus 88% between 9 AM–12 PM.

Thursday is the weak spot.

AS 188 arrived on time 100% of the time on Wednesdays. On Thursdays: 89%.

Better than the ANC–SEA route average.

AS 188 arrived on time 92% of the time, versus 85% across the ANC–SEA route.

Better than the Alaska Airlines network average.

AS 188 arrived on time 92% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon91%(34 flights)
  • Tue94%(36 flights)
  • Wed100%(27 flights)
  • Thu89%(35 flights)
  • Fri91%(34 flights)
  • Sat91%(34 flights)
  • Sun92%(36 flights)
On-time by departure window
  • 12–3 AM97%(35 flights)
  • 3–6 AM90%(69 flights)
  • 6–9 AM96%(71 flights)
  • 9 AM–12 PM88%(60 flights)
  • 3–6 PM—(1 flights)
On-time trend by month
100%
Apr

Jun 90% → Apr 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202590%31
August 202586%29
September 2025100%26
October 2025100%30
November 202590%20
December 202586%29
March 202693%15
April 2026100%21
Departures on time
92%
Diverted
0%
Flights flown
236
Months covered
10

Same route, other flights

Keep nerding

Based on 237 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.