Skip to content
WanderNerd
Check a flight

Flight Reliability

AS 329 · Alaska Airlines

Chicago → Seattle (ORD–SEA)98% of its flights flew this route. The rest (SEA–MCI) are included in these numbers.

75
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
14 min
Average arrival delay
0.7%
Cancelled
1 min
Median arrival delay

Based on 275 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 75% of the time, against 70% between 9 AM–12 PM.

Saturdays have been rough.

AS 329 arrived on time 80% of the time on Fridays and just 65% on Saturdays. That gap is worth planning around.

Lagging the Alaska Airlines network.

AS 329 arrived on time 72% of the time, versus 80% across the Alaska Airlines network.

Trending in the right direction.

AS 329 arrived on time 78% of the time over the last three months in the data, compared with 68% in the three months before that.

The breakdown

On-time by weekday
  • Mon71%(41 flights)
  • Tue70%(37 flights)
  • Wed69%(36 flights)
  • Thu71%(42 flights)
  • Fri80%(46 flights)
  • Sat65%(37 flights)
  • Sun74%(34 flights)
On-time by departure window
  • 9 AM–12 PM70%(204 flights)
  • 12–3 PM75%(44 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM75%(20 flights)
On-time trend by month
77%
May

Jun 67% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202574%31
August 202584%31
September 202587%30
October 202563%30
November 202554%28
December 202559%29
January 2026100%10
May 202677%30
Departures on time
77%
Diverted
0%
Flights flown
273
Months covered
12

Same route, other flights

Keep nerding

Based on 275 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.