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Flight Reliability

DL 4047 · Delta Air Lines

Seattle → RDM (SEA–RDM)

87
Pretty Reliable
WanderNerd Reliability Score
90%
Arrive within 15 minutes
6 min early
Average arrival delay
2.0%
Cancelled
16 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

9 PM–12 AM has a slight edge.

Departures between 9 PM–12 AM arrived on time 90% of the time, against 86% between 6–9 PM.

Friday is doing you no favors.

DL 4047 arrived on time 96% of the time on Sundays. On Fridays: 85%.

A bit ahead of the SEA–RDM route.

DL 4047 arrived on time 90% of the time, versus 83% across the SEA–RDM route.

Better than the Delta Air Lines network average.

DL 4047 arrived on time 90% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon90%(49 flights)
  • Tue92%(48 flights)
  • Wed86%(49 flights)
  • Thu90%(48 flights)
  • Fri85%(46 flights)
  • Sat94%(48 flights)
  • Sun96%(48 flights)
On-time by departure window
  • 6–9 PM86%(14 flights)
  • 9 PM–12 AM90%(322 flights)
On-time trend by month
87%
May

Jun 93% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202580%30
August 202584%31
September 2025100%30
October 202594%31
November 202593%27
December 202579%19
January 2026100%23
February 202688%24
March 202690%30
April 202693%30
May 202687%31
Departures on time
89%
Diverted
0.9%
Flights flown
336
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.