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Flight Reliability

AS 20 · Alaska Airlines

San Francisco → New York (SFO–JFK)

66
Usually Fine
WanderNerd Reliability Score
69%
Arrive within 15 minutes
16 min
Average arrival delay
1.9%
Cancelled
1 min
Median arrival delay

Based on 321 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AS 20 departing between 9 PM–12 AM arrived on time 90% of the time, versus 61% between 12–3 PM.

Friday has been the better bet.

A small edge: 73% on time on Fridays against 67% on Mondays.

Lagging the SFO–JFK route.

AS 20 arrived on time 69% of the time, versus 81% across the SFO–JFK route.

Lagging the Alaska Airlines network.

AS 20 arrived on time 69% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon67%(42 flights)
  • Tue69%(39 flights)
  • Wed69%(49 flights)
  • Thu68%(47 flights)
  • Fri73%(45 flights)
  • Sat70%(43 flights)
  • Sun67%(49 flights)
On-time by departure window
  • 6–9 AM89%(28 flights)
  • 9 AM–12 PM88%(25 flights)
  • 12–3 PM61%(221 flights)
  • 9 PM–12 AM90%(40 flights)
On-time trend by month
84%
May

Jun 38% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202538%29
July 202526%31
August 202565%31
September 202576%29
October 202558%31
November 202583%29
December 202583%29
January 202677%17
February 2026100%15
March 202685%26
April 202686%22
May 202684%25
Departures on time
76%
Diverted
0.3%
Flights flown
314
Months covered
12

Same route, other flights

Keep nerding

Based on 321 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.