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Flight Reliability

DL 459 · Delta Air Lines

Seattle → Boston (SEA–BOS)

86
Pretty Reliable
WanderNerd Reliability Score
89%
Arrive within 15 minutes
4 min early
Average arrival delay
2.2%
Cancelled
14 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Skip Wednesday if you can.

DL 459 arrived on time 94% of the time on Sundays. On Wednesdays: 84%.

Better than the SEA–BOS route average.

DL 459 arrived on time 89% of the time, versus 75% across the SEA–BOS route.

Better than the Delta Air Lines network average.

DL 459 arrived on time 89% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon88%(48 flights)
  • Tue87%(52 flights)
  • Wed84%(51 flights)
  • Thu89%(52 flights)
  • Fri90%(51 flights)
  • Sat88%(51 flights)
  • Sun94%(50 flights)
On-time trend by month
97%
May

Jun 93% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%29
July 202597%30
August 202594%31
September 202580%30
October 202568%31
November 202586%29
December 202590%30
January 202689%28
February 202689%27
March 202694%31
April 202686%29
May 202697%30
Departures on time
90%
Diverted
0.5%
Flights flown
355
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.