IND to SEA flight delays
Indianapolis, IN (IND) Seattle, WA (SEA) · 1,866 miles
564 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
72.43%
Arrived on time
Within 15 minutes of schedule
1.42%
Cancelled
Share of scheduled flights
52 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
The season swings this route hard. In May it ran 36.9 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.
This route does worse than its own airport. IND as a whole runs 8.6 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
Only Alaska Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 564 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over January 2025 – August 2026, Alaska Airlines arrived on time most often on IND to SEA. Flights ran closest to schedule in May and worst in December.
Every airline on IND 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 | 564 | 72.43% | 1.42% | 52 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SEA to IND Seattle back to Indianapolis 74.28% on time DOther routes from Indianapolis
Common questions
Are flights from Indianapolis to Seattle usually delayed?
72.43% of flights on the IND 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 airlines fly from Indianapolis to Seattle?
Only Alaska Airlines appears in the published record on this route, with 564 flights and 72.43% arriving on time.
How often are IND to SEA flights cancelled?
1.42% of scheduled flights did not operate — about 14 in every thousand. That is in the normal range.
What is the best month to fly Indianapolis to Seattle?
May, when 91.9% of flights arrived on time. The worst was December at 55%.
When IND to SEA flights are late, how late are they?
About 52 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 IND 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 →