OnTimeStats

Historical on-time performance

Washington to Los Angeles

2,311 miData through Dec 2025Source: US DOT · BTS

Flights on DCA–LAX arrive on time 73% of the time over the last 12 months.

On-time rate73%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights

based on 1,343 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Alaska Airlines
    On-time68%
    Medianon time
    p9050 min
    Cancel1.3%
    Flights307
  • Delta Air Lines
    On-time66%
    Medianon time
    p9075 min
    Cancel1.6%
    Flights306
  • American Airlinesbest
    On-time78%
    Medianon time
    p9045 min
    Cancel1.0%
    Flights730

Why flights run late

Delay causes

  • Airline36%
  • Weather6%
  • Air traffic (NAS)27%
  • Late aircraft32%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly DCA → LAX

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 74% to 77% on time.

  • Mornings77% on time · p90 30 min · 2,187 flights
  • Evenings77% on time · p90 50 min · 2,005 flights
  • Afternoons74% on time · p90 35 min · 182 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 80% on time.

  • Saturdays80% on time · p90 45 min · 624 flights
  • Thursdays79% on time · p90 35 min · 617 flights
  • Mondays78% on time · p90 35 min · 627 flights
  • Tuesdays77% on time · p90 30 min · 628 flights
  • Fridays76% on time · p90 40 min · 624 flights
  • Sundays75% on time · p90 40 min · 627 flights
  • Wednesdays74% on time · p90 40 min · 627 flights
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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.