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Flight Reliability

DL 541 · Delta Air Lines

Seattle → Washington (SEA–IAD)96% of its flights flew this route. The rest (LGA–ATL) are included in these numbers.

79
Usually Fine
WanderNerd Reliability Score
78%
Arrive within 15 minutes
9 min
Average arrival delay
1.4%
Cancelled
6 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 79% of the time, against 75% between 9 PM–12 AM.

Skip Saturday if you can.

DL 541 arrived on time 87% of the time on Wednesdays. On Saturdays: 73%.

A bit behind the SEA–IAD route.

DL 541 arrived on time 78% of the time, versus 82% across the SEA–IAD route.

A bit behind the Delta Air Lines network.

DL 541 arrived on time 78% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon76%(50 flights)
  • Tue77%(52 flights)
  • Wed87%(52 flights)
  • Thu79%(52 flights)
  • Fri76%(50 flights)
  • Sat73%(52 flights)
  • Sun77%(51 flights)
On-time by departure window
  • 3–6 PM79%(233 flights)
  • 9 PM–12 AM75%(126 flights)
On-time trend by month
87%
May

Jun 76% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%29
July 202577%31
August 202574%31
September 202577%30
October 202581%31
November 202583%29
December 202568%31
January 202673%30
February 202678%27
March 202667%30
April 202693%29
May 202687%31
Departures on time
77%
Diverted
0.3%
Flights flown
359
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.