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Route on-time record

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

Seattle (Seattle–Tacoma International Airport) to Indianapolis (Indianapolis International Airport). 565 nonstop flights in Jun 2025 to May 2026, 73% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was Alaska 545 at 10:32 PM.

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

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SEA → IND

Seattle to Indianapolis: 565 nonstop flights a year

On time (12 months)

73%

Cancelled

1.2%

avg delay 13 min

Best time to leave

No clear winner

Most reliable airline

Alaska

73% chance on time

Check SEA to IND fares

Lowest nonstop fare seen in the next two months: $221 (Alaska 344 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 545

    10:32 PM → 5:45 AM4h 13m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 624; its record covers all of them.

    74%

    chance on time

    On time (history)
    74%
    Cancelled
    1.0%
    Avg arrival delay
    11 min
    • Arrived on time 74% of the time (197 flights, Jun 2025 to May 2026).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Moderate track record · 197 flights

    Find Alaska 545 fares Opens this date on Aviasales

  2. #2 · Alaska 500

    10:57 AM → 6:07 PM4h 11m nonstop

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

    71%

    chance on time

    On time (history)
    72%
    Cancelled
    0.9%
    Avg arrival delay
    14 min
    • Arrived on time 72% of the time (322 flights, Jun 2025 to May 2026).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Strong track record · 322 flights

    Find Alaska 500 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Alaska Airlines73%

    565 flights · 73% on time as flown · 1.2% cancel

On time by departure time

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

  • 9 AM to noon73%

    353 flights · avg delay 14 min

  • After 9 PM74%

    212 flights · avg delay 11 min

Best day: Tuesday (79%). Worst: Saturday (67%).

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
67
F
84
M
77
A
79
M
70
J
66
J
68
A
68
S
68
O
88
N
94
D
74

What delays this route

  • Airline (crew, maintenance, boarding)42%
  • Late-arriving aircraft38%
  • Air traffic control and airport volume20%

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 SEA to IND…

SEA to IND questions

Which airline is most on time from SEA to IND?
Alaska, with a season-adjusted 73% chance of operating and arriving on time over 565 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 SEA to IND?
June (66% on time); the best was November (94%), 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