62% of BWI → SEA flights arrived on time in June-August 2026 (241 flights). The most reliable was AS 786, on time 79% of the time on this route. Morning flights did best (74%), afternoon flights worst (43%). Baltimore (BWI): no delay reported. Seattle (SEA): no delay reported.
Best time of day to fly BWI → SEA
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights BWI → SEA, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| AS 786 Alaska Airlines | 7:03 AM | 1.1% | |
| AS 379 Alaska Airlines | 6:07 PM | 0% | |
| WN 868 Southwest | 3:45 PM | 0.9% |
BWI conditions · SEA conditions · SEA → BWI · Cancellations
Plans changed?
Find another flightToday's seats BWI → SEA, any airlineRental car at BWIDrive insteadHotel near BWIFree cancellation on most rooms
Affiliate links.
From BTS on-time data, June-August 2026; flights with 20+ trips on this route. On-time rates cover each flight number's whole day, which can include other legs. Departure times are local.