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Flight Reliability

AS 517 · Alaska Airlines

Fort Lauderdale → Seattle (FLL–SEA)94% of its flights flew this route. The rest (SEA–FLL) are included in these numbers.

59
A Little Dicey
WanderNerd Reliability Score
64%
Arrive within 15 minutes
14 min
Average arrival delay
1.5%
Cancelled
5 min
Median arrival delay

Based on 336 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

AS 517 departing between 6–9 AM arrived on time 90% of the time, versus 62% between 6–9 PM.

Sunday scaries are real for this one.

AS 517 arrived on time 75% of the time on Tuesdays and just 51% on Sundays. That gap is worth planning around.

A bit behind the FLL–SEA route.

AS 517 arrived on time 64% of the time, versus 69% across the FLL–SEA route.

Well behind the Alaska Airlines network.

AS 517 arrived on time 64% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon72%(46 flights)
  • Tue75%(40 flights)
  • Wed55%(44 flights)
  • Thu71%(49 flights)
  • Fri62%(50 flights)
  • Sat61%(49 flights)
  • Sun51%(49 flights)
On-time by departure window
  • 6–9 AM90%(19 flights)
  • 3–6 PM63%(103 flights)
  • 6–9 PM62%(205 flights)
On-time trend by month
90%
May

Jun 48% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202548%29
July 202567%30
August 202548%31
September 202570%30
October 202574%31
November 202565%26
December 202541%29
February 202646%13
March 202654%24
April 202672%29
May 202690%49
Departures on time
73%
Diverted
1.2%
Flights flown
327
Months covered
12

Same route, other flights

Keep nerding

Based on 336 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.