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Route · IDA → SEA · 2020–2025 BTS data

Idaho Falls to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IDA to SEA (Idaho Falls to Seattle) ranks #4810 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.4%
On-time
+0.4 pts
vs US avg
70 min
Delay when late
602
Flights
#4810 of 4927
Corpus placement

Cancelled

1.5%

Best Month

Nov 2025 83%

Worst Month

Dec 2025 75%

Distance

566 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 55 14 0 0 OO
Nov 2025 58 10 0 0 OO
Dec 2022 31 10 4 1 QX
Oct 2022 31 2 0 0 QX
Sep 2022 30 3 0 0 QX
Aug 2022 31 5 0 0 QX
Jul 2022 31 0 0 0 QX
Jun 2022 45 12 0 0 QX
May 2022 44 8 0 0 QX
Apr 2022 30 8 1 0 QX
Mar 2022 31 4 1 0 QX
Jan 2022 31 22 0 0 QX
Dec 2021 31 11 2 0 QX
Oct 2021 31 4 0 0 QX
Sep 2021 30 6 0 0 QX
Aug 2021 31 2 0 0 QX
Jul 2021 31 3 1 0 QX

IDA–SEA seasonal on-time pattern

Best: July (95.2%) · weakest: January (29.0%)

20%40%60%80%100% JanMarAprMayJunJulAugSepOctNovDec 70.1%

Strongest calendar month

July

95.2% on-time · ~31 flights/mo

Busiest calendar month

November

~58 flights/mo avg

Weakest calendar month

January

29.0% on-time · ~31 flights/mo

Cancellation Rate

1.5%

9 of 602 flights

Diversion Rate

0.2%

1 of 602 flights

Explore origin & destination

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

IDA - Idaho Falls

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

IDA on-time profile

SEA - Seattle

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

SEA on-time profile

Compare the two airports

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

Compare IDA vs SEA

Origin-hub reliability standing

Mid-pack among IDA departures

From IDA, this corridor sits with 4 other 75–85% on-time routes out of 5 tracked departures, not the hub's reliability leaders (1 at ≥85%) and not the softest ( 0 below 75%). Destination: Seattle · fleet on-time rank #3372 of 4927.

What the Data Says About IDA to SEA

602 tracked flights put the IDA to SEA pairing (Idaho Falls to Seattle) at a 79.4% on-time rate, squarely in line with the wider network. Delays that do occur run 69.8 minutes on average. Across the 566-mile route and its 2 carriers, the trailing 24 months show 1.5% cancelled and 0.2% diverted (602 flights sampled).

Monthly performance varies moderately here: Nov 2025 was the strongest month at 83% on-time versus Dec 2025 at 75%, a 8-point difference.

On the multi-year calendar, IDA–SEA peaks in July at 95.2% on-time while November carries the heaviest traffic (~58 flights per month) ; the softest month is January at 29.0%, a 66.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does IDA to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, IDA to SEA ranks #4810 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 IDA to SEA? ▼
Flights from Idaho Falls to Seattle have a 79.4% on-time rate based on 602 flights. The average delay is 69.8 minutes. The best recent month was Nov 2025 with 83% on-time.
What is the cancellation rate for IDA to SEA? ▼
Over the last 24 months, 1.5% of flights on this route were cancelled (9 of 602 flights) and 0.2% were diverted.
How far is the flight from IDA to SEA? ▼
The flight distance from Idaho Falls (IDA) to Seattle (SEA) is approximately 566 miles. This route is served by 2 carriers.
When is the best time to fly from IDA to SEA? ▼
The best recent month for on-time performance was Nov 2025 (83% on-time). The worst was Dec 2025 (75% on-time). Consider booking during months with historically better performance.

Airports on this route

IDA Airport

Idaho Falls
SEA Airport

Seattle
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 IDA–SEA data

IDA–SEA is mid-pack at 79.4% on-time; month and carrier mix move more than the corridor headline.

  • Compare IDA and SEA airport profiles: delay causes and top routes differ even on the same corridor. IDA airport
  • If your dates flex, July (95.2% on-time) beats January (29.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.4% 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.