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Flight Reliability

AS 378 · Alaska Airlines

Seattle → Baltimore (SEA–BWI)95% of its flights flew this route. The rest (SEA–ANC) are included in these numbers.

87
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
3 min early
Average arrival delay
0.5%
Cancelled
8 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

AS 378 departing between 12–3 PM arrived on time 95% of the time, versus 84% between 9 AM–12 PM.

Skip Monday if you can.

AS 378 arrived on time 90% of the time on Saturdays. On Mondays: 78%.

A bit ahead of the Alaska Airlines network.

AS 378 arrived on time 84% of the time, versus 80% across the Alaska Airlines network.

Ticking up lately.

AS 378 arrived on time 92% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon78%(50 flights)
  • Tue86%(51 flights)
  • Wed81%(52 flights)
  • Thu81%(52 flights)
  • Fri85%(52 flights)
  • Sat90%(52 flights)
  • Sun88%(51 flights)
On-time by departure window
  • 9 AM–12 PM84%(341 flights)
  • 12–3 PM95%(19 flights)
On-time trend by month
97%
May

Jun 87% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202566%29
August 202568%31
September 202577%30
October 202590%31
November 202587%30
December 202584%31
January 202683%29
February 202693%27
March 202687%31
April 202693%30
May 202697%31
Departures on time
83%
Diverted
0.8%
Flights flown
360
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.