Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 478 · Delta Air Lines

Atlanta → Portland (ATL–PDX)87% of its flights flew this route. The rest (EYW–LGA, LGA–EYW) are included in these numbers.

69
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
14 min
Average arrival delay
1.9%
Cancelled
1 min
Median arrival delay

Based on 376 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 478 departing between 9 PM–12 AM arrived on time 79% of the time, versus 43% between 9 AM–12 PM.

Friday is doing you no favors.

DL 478 arrived on time 79% of the time on Sundays. On Fridays: 64%.

Lagging the ATL–PDX route.

DL 478 arrived on time 72% of the time, versus 80% across the ATL–PDX route.

Lagging the Delta Air Lines network.

DL 478 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon67%(54 flights)
  • Tue78%(49 flights)
  • Wed77%(51 flights)
  • Thu77%(51 flights)
  • Fri64%(53 flights)
  • Sat66%(53 flights)
  • Sun79%(56 flights)
On-time by departure window
  • 9 AM–12 PM43%(14 flights)
  • 12–3 PM71%(24 flights)
  • 3–6 PM—(7 flights)
  • 6–9 PM74%(275 flights)
  • 9 PM–12 AM79%(47 flights)
On-time trend by month
58%
May

Jun 79% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%28
July 202577%26
August 202581%31
September 202590%30
October 202581%31
November 202570%30
December 202556%39
January 202674%34
February 202673%26
March 202648%31
April 202687%30
May 202658%31
Departures on time
78%
Diverted
0.5%
Flights flown
367
Months covered
12

Same route, other flights

Keep nerding

Based on 376 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.