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Flight Reliability

AS 537 · Alaska Airlines

Boston → Seattle (BOS–SEA)82% of its flights flew this route. The rest (BUR–SEA) are included in these numbers.

81
Pretty Reliable
WanderNerd Reliability Score
77%
Arrive within 15 minutes
7 min
Average arrival delay
0.7%
Cancelled
3 min early
Median arrival delay

Based on 287 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

AS 537 departing between 3–6 PM arrived on time 86% of the time, versus 63% between 12–3 PM.

Friday is doing you no favors.

AS 537 arrived on time 81% of the time on Sundays. On Fridays: 71%.

A bit ahead of the BOS–SEA route.

AS 537 arrived on time 77% of the time, versus 71% across the BOS–SEA route.

A bit behind the Alaska Airlines network.

AS 537 arrived on time 77% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon78%(41 flights)
  • Tue80%(39 flights)
  • Wed73%(37 flights)
  • Thu75%(40 flights)
  • Fri71%(42 flights)
  • Sat79%(42 flights)
  • Sun81%(43 flights)
On-time by departure window
  • 9 AM–12 PM78%(233 flights)
  • 12–3 PM63%(30 flights)
  • 3–6 PM86%(21 flights)
On-time trend by month
87%
May

Jun 60% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202565%31
August 202577%31
September 202597%29
October 202590%31
November 202583%29
December 202548%27
February 202686%14
March 202671%17
May 202687%30
Departures on time
81%
Diverted
0.3%
Flights flown
284
Months covered
12

Same route, other flights

Keep nerding

Based on 287 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.