BNA to SEA flight delays
Nashville, TN (BNA) Seattle, WA (SEA) · 1,978 miles
1,479 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
72.72%
Arrived on time
Within 15 minutes of schedule
1.15%
Cancelled
Share of scheduled flights
53 min
When late, late by
Average across delayed arrivals
16 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. Delta Air Lines arrived on time 38.7 points more often than Southwest Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In February it ran 29.1 points more punctual than in December — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. SEA to BNA arrives on time 5.9 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Flights from Nashville to Seattle run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over January 2025 – August 2026, Delta Air Lines arrived on time most often on BNA to SEA. Southwest Airlines was late most often. Flights ran closest to schedule in February and worst in December.
Every airline on BNA to SEA
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 843 | 70.33% | 1.42% | 49 min | D |
| Delta Air Lines | 511 | 83.43% | 0.78% | 66 min | B |
| Southwest Airlines | 125 | 44.72% | 0.8% | 52 min | F |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SEA to BNA Seattle back to Nashville 78.58% on time COther routes from Nashville
Common questions
Are flights from Nashville to Seattle usually delayed?
72.72% of flights on the BNA to SEA route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Nashville to Seattle?
Delta Air Lines, at 83.43% on time across 511 flights. The least punctual on the route was Southwest Airlines at 44.72%.
How often are BNA to SEA flights cancelled?
1.15% of scheduled flights did not operate — about 12 in every thousand. That is in the normal range.
What is the best month to fly Nashville to Seattle?
February, when 84.2% of flights arrived on time. The worst was December at 55.1%.
When BNA to SEA flights are late, how late are they?
About 53 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on BNA to SEA during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →