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Flight Reliability

DL 3954 · Delta Air Lines

Seattle → MFR (SEA–MFR)

94
Nerd Approved
WanderNerd Reliability Score
89%
Arrive within 15 minutes
2 min early
Average arrival delay
0.5%
Cancelled
9 min early
Median arrival delay

Based on 365 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 84% between 6–9 PM.

Thursday is the weak spot.

DL 3954 arrived on time 96% of the time on Tuesdays. On Thursdays: 86%.

A bit ahead of the SEA–MFR route.

DL 3954 arrived on time 89% of the time, versus 86% across the SEA–MFR route.

Better than the Delta Air Lines network average.

DL 3954 arrived on time 89% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon89%(52 flights)
  • Tue96%(52 flights)
  • Wed88%(51 flights)
  • Thu86%(51 flights)
  • Fri88%(51 flights)
  • Sat87%(52 flights)
  • Sun91%(53 flights)
On-time by departure window
  • 3–6 PM—(3 flights)
  • 6–9 PM84%(32 flights)
  • 9 PM–12 AM90%(327 flights)
On-time trend by month
77%
May

Jun 87% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202581%31
August 202590%31
September 2025100%30
October 202594%31
November 202587%30
December 202590%30
January 202697%29
February 202696%28
March 202684%31
April 202690%30
May 202677%31
Departures on time
89%
Diverted
0.3%
Flights flown
362
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.