Indianapolis (IND) to Seattle (SEA): On-Time Performance
Data through July 2026
When you fly IND to SEA matters as much as anything else about the booking: the route swung from 93% on-time in October 2024 to just 55% in December 2025. Across the full period the route averages 75% on-time against a national 78%. Morning departures also hold up better than evening ones (81% vs 71%), which matters most in the rough months.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 1.5
- last 12 months
- Duration
- 4h 50m
- scheduled
- Distance
- 1,866 mi
Monthly on-time trend
Best time to fly from IND to SEA
Aim for departures around 7 a.m. (82% on-time); avoid 7 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 17 min |
| Tuesdaybest | 80% | 9 min |
| Wednesday | 75% | 12 min |
| Thursday | 77% | 11 min |
| Friday | 75% | 15 min |
| Saturday | 74% | 17 min |
| Sunday | 72% | 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 aircraft59%
- Airline operations20%
- National airspace system17%
- Weather5%
Frequently asked questions
- How often are flights from IND to SEA delayed?
- 25% of IND–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- What is the best time of day to fly from IND to SEA?
- Departures around 7 a.m. have the best record (82% on-time), while departures around 7 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IND to SEA?
- The scheduled IND–SEA flight time averages 4h 50m over 1,866 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are IND to SEA flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IND to SEA?
- December 2025 was the roughest month in this dataset, with only 55% of arrivals on time. The best was October 2024 at 93%. If your dates are flexible, that 38-point gap is worth planning around.
Explore related pages
More routes from IND
Other ways to fly to Seattle (SEA)
Related guides
Based on 1,176 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.