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Flight Reliability

DL 507 · Delta Air Lines

Los Angeles → Boston (LAX–BOS)95% of its flights flew this route. The rest (LAS–SEA, SAT–ATL) are included in these numbers.

83
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
1 min
Average arrival delay
2.8%
Cancelled
8 min early
Median arrival delay

Based on 284 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 91% of the time, against 86% between 9 PM–12 AM.

Thursdays have been rough.

DL 507 arrived on time 96% of the time on Fridays and just 80% on Thursdays. That gap is worth planning around.

A bit ahead of the LAX–BOS route.

DL 507 arrived on time 86% of the time, versus 79% across the LAX–BOS route.

A bit ahead of the Delta Air Lines network.

DL 507 arrived on time 86% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon80%(44 flights)
  • Tue83%(36 flights)
  • Wed91%(43 flights)
  • Thu80%(44 flights)
  • Fri96%(44 flights)
  • Sat96%(22 flights)
  • Sun84%(43 flights)
On-time by departure window
  • 3–6 PM91%(11 flights)
  • 6–9 PM—(3 flights)
  • 9 PM–12 AM86%(262 flights)
On-time trend by month
96%
May

Jun 82% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%22
July 202592%24
August 202591%22
September 202588%17
October 202591%23
November 202595%19
December 202589%27
January 202691%21
February 202680%20
March 202674%27
April 202670%27
May 202696%27
Departures on time
86%
Diverted
0%
Flights flown
276
Months covered
12

Same route, other flights

Keep nerding

Based on 284 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.