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Route · SEA → FCA · 2020–2025 BTS data

Seattle to Kalispell

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to FCA (Seattle to Kalispell) ranks #3600 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

86.1%
On-time
+7.1 pts
vs US avg
58 min
Delay when late
2,374
Flights
#3600 of 4927
Corpus placement

Cancelled

1.1%

Best Month

Oct 2022 96%

Worst Month

Dec 2022 69%

Distance

379 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2022 77 24 8 0 QX
Nov 2022 87 12 2 0 OO,QX
Oct 2022 93 4 0 0 QX
Sep 2022 114 15 0 0 QX
Aug 2022 93 12 0 0 QX
Jul 2022 93 12 0 0 QX
Jun 2022 90 10 0 0 QX
May 2022 93 14 0 1 QX
Apr 2022 90 21 0 0 QX
Mar 2022 69 7 0 0 QX
Feb 2022 56 7 0 0 QX
Jan 2022 62 16 4 0 QX
Dec 2021 62 15 2 0 QX
Nov 2021 87 9 0 0 QX,OO
Oct 2021 93 6 1 1 OO,QX
Sep 2021 100 15 0 0 OO,QX
Aug 2021 133 29 0 1 OO,QX
Jul 2021 133 16 0 0 OO,QX
Jun 2021 128 16 0 0 OO,QX
May 2021 106 9 0 0 OO,QX
Apr 2021 93 8 0 0 QX
Mar 2021 124 15 2 0 QX
Feb 2021 112 21 6 0 QX
Jan 2021 124 9 1 0 QX

SEA–FCA seasonal on-time pattern

Best: October (94.6%) · weakest: December (71.9%)

70%75%80%85%90%95%100% JanFebMarAprMayJunJulAugSepOctNovDec 71.9%

Strongest calendar month

October

94.6% on-time · ~93 flights/mo

Busiest calendar month

June

~109 flights/mo avg

Weakest calendar month

December

71.9% on-time · ~70 flights/mo

Cancellation Rate

1.1%

26 of 2,312 flights

Diversion Rate

0.1%

3 of 2,312 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

FCA - Kalispell

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

FCA on-time profile

Compare the two airports

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

Compare SEA vs FCA

Origin-hub reliability standing

Among SEA's stronger departures

SEA → FCA posts a 86.1% on-time rate, landing in the ≥85% band with 25 of 89 BTS-tracked routes leaving Seattle. The same hub also shows 63 mid-band and 1 challenged departures · fleet-wide on-time rank #888 of 4927 (highest on-time = #1).

What the Data Says About SEA to FCA

Seattle to Kalispell (SEA to FCA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.1% on-time rate across 2,374 flights, with delays that do happen averaging 57.5 minutes. The corridor runs roughly 379 miles and is served by 4 carriers. Over the most recent 24 months, 26 of 2,312 flights were cancelled (1.1%) and 3 diverted (0.1%).

The monthly split is wide on this route: Oct 2022 posted the strongest performance at 96% on-time, while Dec 2022 came in at just 69% - a 27-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–FCA peaks in October at 94.6% on-time while June carries the heaviest traffic (~109 flights per month) ; the softest month is December at 71.9%, a 22.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to FCA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to FCA ranks #3600 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 FCA? ▼
Flights from Seattle to Kalispell have a 86.1% on-time rate based on 2,374 flights. The average delay is 57.5 minutes. The best recent month was Oct 2022 with 96% on-time.
What is the cancellation rate for SEA to FCA? ▼
Over the last 24 months, 1.1% of flights on this route were cancelled (26 of 2,312 flights) and 0.1% were diverted.
How far is the flight from SEA to FCA? ▼
The flight distance from Seattle (SEA) to Kalispell (FCA) is approximately 379 miles. This route is served by 4 carriers.
When is the best time to fly from SEA to FCA? ▼
The best recent month for on-time performance was Oct 2022 (96% on-time). The worst was Dec 2022 (69% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
FCA Airport

Kalispell
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–FCA data

SEA–FCA runs 7.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SEA and FCA airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, October (94.6% on-time) beats December (71.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 86.1% 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.