Washington to Los Angeles

What the Data Says About IAD to LAX

The Washington to Los Angeles corridor (IAD → LAX) covers roughly 2,288 miles and is served by 6 carriers, based on Bureau of Transportation Statistics reporting. Across 12,535 flights in the dataset, this route posts a 82.9% on-time rate with an average delay of 70.2 minutes when flights run late. Over the most recent 24 months of BTS data, 5,053 flights were recorded on this pairing — 50 cancelled (1.0%) and 8 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 6 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 12,535 total flights analyzed, the 82.9% on-time figure is statistically meaningful rather than a small-sample fluke. The 70.2-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Sep 2024 posted the best performance on this corridor at 93% on-time, while Jul 2025 came in at 61% on-time — a 33-point gap between best and worst recent month. For travelers evaluating the IAD to LAX route, the combination of a 82.9% on-time rate, 70.2-minute average delay, 1.0% recent cancellation rate, and 6 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.