Seattle (SEA) to Indianapolis (IND): On-Time Performance
Data through May 2026
The calendar drives reliability on SEA–IND. November 2024 flights landed on schedule 97% of the time, but July 2025 dropped to 51% — a gap of 47 points. Across the full period the route averages 73% on-time against a national 78%.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 1.5
- last 12 months
- Duration
- 4h 11m
- scheduled
- Distance
- 1,866 mi
Monthly on-time trend
Best time to fly from SEA to IND
Aim for departures around 11 a.m. (80% on-time); avoid 10 a.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 13 min |
| Tuesday | 76% | 10 min |
| Wednesday | 77% | 11 min |
| Thursdaybest | 78% | 11 min |
| Friday | 72% | 11 min |
| Saturday | 68% | 16 min |
| Sunday | 70% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations36%
- National airspace system19%
- Weather1%
Frequently asked questions
- How often are flights from SEA to IND delayed?
- 27% of SEA–IND flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from SEA to IND?
- Departures around 11 a.m. have the best record (80% on-time), while departures around 10 a.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to IND?
- The scheduled SEA–IND flight time averages 4h 11m over 1,866 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are SEA to IND flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to IND?
- July 2025 was the roughest month in this dataset, with only 51% of arrivals on time. The best was November 2024 at 97%. If your dates are flexible, that 47-point gap is worth planning around.
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Based on 1,116 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.