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Route · FCA → SEA · 2020–2025 BTS data

Kalispell to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), FCA to SEA (Kalispell to Seattle) ranks #3598 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

83.3%
On-time
+4.3 pts
vs US avg
63 min
Delay when late
2,374
Flights
#3598 of 4927
Corpus placement

Cancelled

1.2%

Best Month

May 2021 97%

Worst Month

Dec 2022 57%

Distance

379 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2022 77 33 8 0 QX
Nov 2022 87 29 1 0 OO,QX
Oct 2022 93 12 0 0 QX
Sep 2022 114 24 0 0 QX
Aug 2022 93 17 0 1 QX
Jul 2022 93 16 0 1 QX
Jun 2022 90 15 0 0 QX
May 2022 93 17 0 0 QX
Apr 2022 90 24 0 0 QX
Mar 2022 69 5 0 0 QX
Feb 2022 56 11 0 0 QX
Jan 2022 62 20 4 0 QX
Dec 2021 62 17 3 0 QX
Nov 2021 87 15 0 0 QX,OO
Oct 2021 93 11 1 0 OO,QX
Sep 2021 100 16 0 0 OO,QX
Aug 2021 133 28 1 0 OO,QX
Jul 2021 133 14 0 0 OO,QX
Jun 2021 128 7 0 0 OO,QX
May 2021 106 3 0 0 OO,QX
Apr 2021 93 9 0 0 QX
Mar 2021 124 11 3 0 QX
Feb 2021 112 24 6 0 QX
Jan 2021 124 13 0 0 QX

FCA–SEA seasonal on-time pattern

Best: March (91.7%) · weakest: December (64.0%)

60%70%80%90%100% JanFebMarAprMayJunJulAugSepOctNovDec 64%

Strongest calendar month

March

91.7% on-time · ~97 flights/mo

Busiest calendar month

June

~109 flights/mo avg

Weakest calendar month

December

64.0% on-time · ~70 flights/mo

Cancellation Rate

1.2%

27 of 2,312 flights

Diversion Rate

0.1%

2 of 2,312 flights

Explore origin & destination

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

FCA - Kalispell

Full on-time, delay-cause, and seasonal performance for Kalispell, MT.

FCA 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 FCA and SEA side by side on delays, cancellations, and reliability.

Compare FCA vs SEA

Origin-hub reliability standing

Mid-pack among FCA departures

From FCA, this corridor sits with 4 other 75–85% on-time routes out of 7 tracked departures, not the hub's reliability leaders (2 at ≥85%) and not the softest ( 1 below 75%). Destination: Seattle · fleet on-time rank #1832 of 4927.

What the Data Says About FCA to SEA

Bureau of Transportation Statistics records show Kalispell to Seattle (FCA to SEA) running a 83.3% on-time rate over 2,374 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 63.0 minutes. The 379-mile corridor is served by 4 carriers, and over the last 24 months 1.2% of 2,312 flights were cancelled, 0.1% diverted.

The monthly split is wide on this route: May 2021 posted the strongest performance at 97% on-time, while Dec 2022 came in at just 57% - a 40-point swing worth factoring into travel timing.

On the multi-year calendar, FCA–SEA peaks in March at 91.7% on-time while June carries the heaviest traffic (~109 flights per month) ; the softest month is December at 64.0%, a 27.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does FCA to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, FCA to SEA ranks #3598 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 FCA to SEA? ▼
Flights from Kalispell to Seattle have a 83.3% on-time rate based on 2,374 flights. The average delay is 63.0 minutes. The best recent month was May 2021 with 97% on-time.
What is the cancellation rate for FCA to SEA? ▼
Over the last 24 months, 1.2% of flights on this route were cancelled (27 of 2,312 flights) and 0.1% were diverted.
How far is the flight from FCA to SEA? ▼
The flight distance from Kalispell (FCA) to Seattle (SEA) is approximately 379 miles. This route is served by 4 carriers.
When is the best time to fly from FCA to SEA? ▼
The best recent month for on-time performance was May 2021 (97% on-time). The worst was Dec 2022 (57% on-time). Consider booking during months with historically better performance.

Airports on this route

FCA Airport

Kalispell
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 FCA–SEA data

FCA–SEA runs 4.3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare FCA and SEA airport profiles: delay causes and top routes differ even on the same corridor. FCA airport
  • If your dates flex, March (91.7% on-time) beats December (64.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 83.3% 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.