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Route Reliability

Washington → Los Angeles

IAD–LAX · 2,288 miles · Washington Dulles International Airport to Los Angeles International Airport

86
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
2 min
Average arrival delay
0.8%
Cancelled
2,427
Flights in the data

Data through May 2026.

Airlines on this route

  • United Airlines83% on time · 2,293 flights
  • Alaska Airlines43% on time · 80 flights
  • American Airlines70% on time · 54 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

Morning flights do better here.

IAD–LAX flights departing between 9 AM–12 PM arrived on time 97% of the time, versus 74% between 6–9 PM.

Monday comes out ahead.

A small edge: 84% on time on Mondays against 78% on Thursdays.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon84%(356 flights)
  • Tue82%(333 flights)
  • Wed82%(338 flights)
  • Thu78%(356 flights)
  • Fri82%(359 flights)
  • Sat82%(315 flights)
  • Sun79%(347 flights)
On-time by departure window
  • 6–9 AM88%(563 flights)
  • 9 AM–12 PM97%(60 flights)
  • 12–3 PM89%(363 flights)
  • 3–6 PM74%(449 flights)
  • 6–9 PM74%(633 flights)
  • 9 PM–12 AM83%(336 flights)
On-time trend by month
88%
May

Jun 69% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%226
July 202560%220
August 202581%195
September 202591%173
October 202591%201
November 202588%196
December 202587%213
January 202677%165
February 202682%158
March 202685%184
April 202681%222
May 202688%251

Same trip, other airports

Keep nerding

Based on 2,427 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.