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Flight Reliability

DL 4036 · Delta Air Lines

RDM → Seattle (RDM–SEA)

91
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
0 min
Average arrival delay
1.4%
Cancelled
14 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

DL 4036 departing between 6–9 AM arrived on time 89% of the time, versus 69% between 3–6 AM.

Sunday comes out ahead.

A small edge: 92% on time on Sundays against 86% on Mondays.

A bit ahead of the RDM–SEA route.

DL 4036 arrived on time 88% of the time, versus 85% across the RDM–SEA route.

Better than the Delta Air Lines network average.

DL 4036 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue89%(52 flights)
  • Wed87%(52 flights)
  • Thu89%(52 flights)
  • Fri90%(51 flights)
  • Sat86%(51 flights)
  • Sun92%(52 flights)
On-time by departure window
  • 3–6 AM69%(16 flights)
  • 6–9 AM89%(344 flights)
On-time trend by month
94%
May

Jun 97% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202594%31
August 202590%31
September 202593%30
October 202587%31
November 202590%30
December 202581%31
January 202677%30
February 202683%24
March 202690%31
April 202683%30
May 202694%31
Departures on time
91%
Diverted
0%
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.