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Route · SEA → IDA · 2020–2025 BTS data

Seattle to Idaho Falls

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to IDA (Seattle to Idaho Falls) ranks #4811 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

77.1%
On-time
-1.9 pts
vs US avg
55 min
Delay when late
602
Flights
#4811 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Nov 2025 86%

Worst Month

Dec 2025 71%

Distance

566 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 55 16 0 1 OO
Nov 2025 58 8 0 0 OO
Dec 2022 31 6 4 0 QX
Oct 2022 31 4 0 0 QX
Sep 2022 30 8 0 1 QX
Aug 2022 31 6 0 1 QX
Jul 2022 31 3 0 0 QX
Jun 2022 45 14 0 0 QX
May 2022 44 13 0 0 QX
Apr 2022 30 7 0 0 QX
Mar 2022 31 6 0 0 QX
Jan 2022 31 17 0 0 QX
Dec 2021 31 6 2 0 QX
Oct 2021 31 3 0 0 QX
Sep 2021 30 6 0 0 QX
Aug 2021 31 9 0 1 QX
Jul 2021 31 6 0 0 QX

SEA–IDA seasonal on-time pattern

Best: October (88.7%) · weakest: January (45.2%)

40%50%60%70%80%90%100% JanMarAprMayJunJulAugSepOctNovDec 76.1%

Strongest calendar month

October

88.7% on-time · ~31 flights/mo

Busiest calendar month

November

~58 flights/mo avg

Weakest calendar month

January

45.2% on-time · ~31 flights/mo

Cancellation Rate

1.0%

6 of 602 flights

Diversion Rate

0.7%

4 of 602 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

IDA - Idaho Falls

Full on-time, delay-cause, and seasonal performance for Idaho Falls, ID.

IDA on-time profile

Compare the two airports

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

Compare SEA vs IDA

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: Idaho Falls · fleet on-time rank #4077 of 4927.

What the Data Says About SEA to IDA

The Seattle to Idaho Falls corridor (SEA to IDA) posts a 77.1% on-time rate on the lower edge of the average band, based on 602 tracked flights. Late flights run 54.9 minutes behind on average. 2 carriers cover the 566-mile route; over the last 24 months, 6 of 602 flights were cancelled (1.0%) and 0.7% diverted.

The monthly split is wide on this route: Nov 2025 posted the strongest performance at 86% on-time, while Dec 2025 came in at just 71% - a 15-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–IDA peaks in October at 88.7% on-time while November carries the heaviest traffic (~58 flights per month) ; the softest month is January at 45.2%, a 43.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to IDA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to IDA ranks #4811 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 IDA? ▼
Flights from Seattle to Idaho Falls have a 77.1% on-time rate based on 602 flights. The average delay is 54.9 minutes. The best recent month was Nov 2025 with 86% on-time.
What is the cancellation rate for SEA to IDA? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (6 of 602 flights) and 0.7% were diverted.
How far is the flight from SEA to IDA? ▼
The flight distance from Seattle (SEA) to Idaho Falls (IDA) is approximately 566 miles. This route is served by 2 carriers.
When is the best time to fly from SEA to IDA? ▼
The best recent month for on-time performance was Nov 2025 (86% on-time). The worst was Dec 2025 (71% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
IDA Airport

Idaho Falls
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–IDA data

SEA–IDA is mid-pack at 77.1% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and IDA airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, October (88.7% on-time) beats January (45.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 77.1% 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.