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Route · SEA → IND · 2020–2025 BTS data

Seattle to Indianapolis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to IND (Seattle to Indianapolis) ranks #3620 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

76.8%
On-time
-2.2 pts
vs US avg
48 min
Delay when late
2,324
Flights
#3620 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Aug 2024 80%

Worst Month

Jul 2025 52%

Distance

1,866 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 41 13 0 0 AS
Nov 2025 39 5 0 0 AS
Oct 2025 48 5 3 1 AS
Sep 2025 51 15 0 0 AS
Aug 2025 59 27 0 0 AS
Jul 2025 61 29 0 1 AS
Jun 2025 60 21 1 0 AS
May 2025 62 25 0 0 AS
Apr 2025 39 10 0 1 AS
Mar 2025 31 7 0 0 AS
Dec 2024 45 11 0 0 AS
Nov 2024 39 1 0 0 AS
Oct 2024 45 5 0 0 AS
Sep 2024 56 20 0 0 AS
Aug 2024 60 12 1 0 AS
Jul 2024 62 17 0 0 AS
Jun 2024 60 19 0 0 AS
May 2024 55 18 0 0 AS
Apr 2024 38 10 0 0 AS
Mar 2024 31 9 0 1 AS
Dec 2023 31 6 0 0 AS
Nov 2023 30 1 0 0 AS
Oct 2023 31 5 0 0 AS
Sep 2023 60 18 0 0 AS

SEA–IND seasonal on-time pattern

Best: November (93.5%) · weakest: December (68.9%)

60%70%80%90%100% JanFebMarAprMayJunJulAugSepOctNovDec 68.9%

Strongest calendar month

November

93.5% on-time · ~36 flights/mo

Busiest calendar month

July

~55 flights/mo avg

Weakest calendar month

December

68.9% on-time · ~37 flights/mo

Cancellation Rate

0.4%

5 of 1,134 flights

Diversion Rate

0.4%

4 of 1,134 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

IND - Indianapolis

Full on-time, delay-cause, and seasonal performance for Indianapolis, IN.

IND on-time profile

Compare the two airports

See SEA and IND side by side on delays, cancellations, and reliability.

Compare SEA vs IND

Origin-hub reliability standing

Mid-pack among SEA departures

From SEA, this corridor sits with 63 other 75–85% on-time routes out of 89 tracked departures, not the hub's reliability leaders (25 at ≥85%) and not the softest ( 1 below 75%). Destination: Indianapolis · fleet on-time rank #4149 of 4927.

What the Data Says About SEA to IND

The Seattle to Indianapolis corridor (SEA to IND) posts a 76.8% on-time rate on the lower edge of the average band, based on 2,324 tracked flights. Late flights run 47.7 minutes behind on average. 2 carriers cover the 1,866-mile route; over the last 24 months, 5 of 1,134 flights were cancelled (0.4%) and 0.4% diverted.

The monthly split is wide on this route: Aug 2024 posted the strongest performance at 80% on-time, while Jul 2025 came in at just 52% - a 28-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–IND peaks in November at 93.5% on-time while July carries the heaviest traffic (~55 flights per month) ; the softest month is December at 68.9%, a 24.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to IND rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to IND ranks #3620 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SEA to IND? ▼
Flights from Seattle to Indianapolis have a 76.8% on-time rate based on 2,324 flights. The average delay is 47.7 minutes. The best recent month was Aug 2024 with 80% on-time.
What is the cancellation rate for SEA to IND? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (5 of 1,134 flights) and 0.4% were diverted.
How far is the flight from SEA to IND? ▼
The flight distance from Seattle (SEA) to Indianapolis (IND) is approximately 1,866 miles. This route is served by 2 carriers.
When is the best time to fly from SEA to IND? ▼
The best recent month for on-time performance was Aug 2024 (80% on-time). The worst was Jul 2025 (52% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
IND Airport

Indianapolis
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SEA–IND data

SEA–IND is mid-pack at 76.8% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and IND airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, November (93.5% on-time) beats December (68.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 76.8% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.