LAX to IAD flight delays & on-time performance
Nonstop flights from Los Angeles International Airport to Washington Dulles International Airport · 2,288 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at LAX or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Los Angeles (LAX) to Washington (IAD) arrived on time 87% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.6% were cancelled, and 3% arrived an hour or more late.
- Departures scheduled around 6am did best (96% on time); around 8am did worst (81%).
- Tuesday was the most reliable day to fly (89% on time) and Saturday the least (83%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (42%).
Which airline is most on time from LAX to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Alaska Airlines | 89% | 0.0% | 6 min | 5.3% | 19 |
| United Airlines | 88% | 0.6% | 7 min | 3.2% | 2,339 |
| American Airlines | 77% | 0.0% | 18 min | 7.0% | 116 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am96%79 flights
- 8am81%385 flights
- 10am90%321 flights
- 11am89%63 flights
- 12pm88%225 flights
- 1pm88%211 flights
- 4pm91%253 flights
- 9pm88%324 flights
- 10pm90%213 flights
- 11pm86%373 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday87%0.3% cancelled
- Tuesday89%0.0% cancelled
- Wednesday87%0.3% cancelled
- Thursday89%0.0% cancelled
- Friday88%1.4% cancelled
- Saturday83%0.3% cancelled
- Sunday88%1.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)42%
- Late-arriving aircraft38%
- Air traffic control & airport congestion19%
- Security0%
- Extreme weather0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)50%
- Extreme weather50%
- Air traffic control & airport congestion0%
- Security0%
LAX to IAD: common questions
- How often are LAX to IAD flights on time?
- 87% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Los Angeles to Washington cancelled?
- 0.6% of scheduled flights were cancelled (14 of 2,474).
- How long are typical delays?
- Across all flights the average arrival delay was 8 min (early arrivals count as zero). Flights that were late arrived 54 min behind schedule on average, and 3.4% of flights were an hour or more late.
- How long is taxi time at LAX?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to LAX — 84% on time
More flights from Los Angeles
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: LAX → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.