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Flight Reliability

AA 1257 · American Airlines

Philadelphia → Boston (PHL–BOS)88% of its flights flew this route. The rest (DCA–BNA, ORD–PDX) are included in these numbers.

37
Bring Snacks
WanderNerd Reliability Score
56%
Arrive within 15 minutes
36 min
Average arrival delay
3.5%
Cancelled
10 min
Median arrival delay

Based on 170 historical flights. Data through May 2026.

What the data says

12–3 PM has a slight edge.

Departures between 12–3 PM arrived on time 56% of the time, against 50% between 6–9 PM.

Sunday scaries are real for this one.

AA 1257 arrived on time 77% of the time on Saturdays and just 39% on Sundays. That gap is worth planning around.

Well behind the PHL–BOS route.

AA 1257 arrived on time 56% of the time, versus 75% across the PHL–BOS route.

Well behind the American Airlines network.

AA 1257 arrived on time 56% of the time, versus 77% across the American Airlines network.

The breakdown

On-time by weekday
  • Mon54%(24 flights)
  • Tue46%(24 flights)
  • Wed68%(22 flights)
  • Thu59%(22 flights)
  • Fri50%(22 flights)
  • Sat77%(22 flights)
  • Sun39%(28 flights)
On-time by departure window
  • 6–9 AM—(3 flights)
  • 12–3 PM56%(147 flights)
  • 3–6 PM—(4 flights)
  • 6–9 PM50%(10 flights)
On-time trend by month
50%
May

Jun 68% → May 50% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%31
July 202546%28
August 202568%31
September 202548%29
October 202548%31
May 202650%10
Departures on time
68%
Diverted
0%
Flights flown
164
Months covered
9

Same route, other flights

Keep nerding

Based on 170 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.