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Route on-time record

IND to SEA: most on-time flights and the best time to fly

Indianapolis (Indianapolis International Airport) to Seattle (Seattle–Tacoma International Airport). 564 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was Alaska 546 at 7:05 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

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IND → SEA

Indianapolis to Seattle: 564 nonstop flights a year

On time (12 months)

72%

Cancelled

1.4%

avg delay 15 min

Best time to leave

Before 9 AM

80% on time vs 66% 6 to 9 PM

Most reliable airline

Alaska

71% chance on time

Check IND to SEA fares

Lowest nonstop fare seen in the next two months: $222 (Alaska 485 on 2026-11-25). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Alaska 546

    7:05 AM → 8:57 AM4h 52m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 625; its record covers all of them.

    79%

    chance on time

    On time (history)
    81%
    Cancelled
    1.3%
    Avg arrival delay
    10 min
    • Arrived on time 81% of the time (228 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 80% on time; 6 to 9 PM: 66%).

    Strong track record · 228 flights

    Find Alaska 546 fares Opens this date on Aviasales

  2. #2 · Alaska 500

    6:57 PM → 8:44 PM4h 51m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    66%

    chance on time

    On time (history)
    67%
    Cancelled
    1.6%
    Avg arrival delay
    18 min
    • Arrived on time 67% of the time (301 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 66% on time; Before 9 AM: 80%).
    • Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
    • 52% of its delay minutes came from the plane arriving late from an earlier flight.

    Strong track record · 301 flights

    Find Alaska 500 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Alaska Airlines71%

    564 flights · 72% on time as flown · 1.4% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM80%

    270 flights · avg delay 11 min

  • 6 to 9 PM66%

    293 flights · avg delay 19 min

Best day: Wednesday (79%). Worst: Sunday (72%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
69
F
79
M
72
A
78
M
76
J
65
J
75
A
71
S
75
O
91
N
85
D
75

What delays this route

  • Late-arriving aircraft56%
  • Air traffic control and airport volume20%
  • Airline (crew, maintenance, boarding)20%
  • Severe weather5%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

Finding the most reliable connections from IND to SEA…

IND to SEA questions

What time of day is best to fly IND to SEA?
Before 9 AM: 80% of flights arrived on time, against 66% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from IND to SEA?
Alaska, with a season-adjusted 71% chance of operating and arriving on time over 564 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on IND to SEA?
June (65% on time); the best was October (91%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

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Live status: FAA delays and ground stops