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Flight Reliability

DL 3639 · Delta Air Lines

EUG → Salt Lake City (EUG–SLC)87% of its flights flew this route. The rest (TUS–LAX, OAJ–ATL) are included in these numbers.

100
Nerd Approved
WanderNerd Reliability Score
97%
Arrive within 15 minutes
8 min early
Average arrival delay
0.4%
Cancelled
13 min early
Median arrival delay

Based on 224 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

DL 3639 departing between 12–3 PM arrived on time 100% of the time, versus 83% between 6–9 PM.

Wednesday comes out ahead.

A small edge: 100% on time on Wednesdays against 93% on Saturdays.

A bit ahead of the EUG–SLC route.

DL 3639 arrived on time 97% of the time, versus 94% across the EUG–SLC route.

Well ahead of the Delta Air Lines network.

DL 3639 arrived on time 97% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon94%(33 flights)
  • Tue97%(30 flights)
  • Wed100%(30 flights)
  • Thu100%(34 flights)
  • Fri100%(33 flights)
  • Sat93%(30 flights)
  • Sun94%(33 flights)
On-time by departure window
  • 3–6 AM97%(195 flights)
  • 12–3 PM100%(16 flights)
  • 6–9 PM83%(12 flights)
On-time trend by month
100%
Dec

Jun 96% → Dec 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%23
July 2025100%31
August 202594%31
September 2025100%30
October 2025100%31
November 202593%30
December 2025100%31
Departures on time
96%
Diverted
0%
Flights flown
223
Months covered
10

Same route, other flights

Keep nerding

Based on 224 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.