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Route · GTF → SEA · 2020–2025 BTS data

Great Falls to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), GTF to SEA (Great Falls to Seattle) ranks #4338 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

85.7%
On-time
+6.7 pts
vs US avg
58 min
Delay when late
1,214
Flights
#4338 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Sep 2021 93%

Worst Month

Sep 2021 93%

Distance

512 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Sep 2025 30 5 0 0 OO
Mar 2025 31 3 0 0 OO
Apr 2024 30 7 0 0 OO
Mar 2024 31 6 0 0 OO
Oct 2023 31 1 0 0 OO
Sep 2023 30 6 0 0 OO
Aug 2023 31 8 0 0 OO
Jul 2023 31 3 0 0 OO
Jun 2023 30 0 0 0 OO
May 2023 31 4 0 0 OO
Apr 2023 30 3 0 0 OO
Dec 2022 31 12 1 0 QX
Oct 2022 31 4 0 0 QX
Sep 2022 30 7 0 0 QX
Aug 2022 31 4 0 0 QX
Jul 2022 31 8 0 0 QX
Jun 2022 30 6 0 0 QX
May 2022 31 8 0 0 QX
Apr 2022 30 7 1 2 QX
Mar 2022 31 5 0 0 QX
Jan 2022 31 9 0 0 QX
Nov 2021 30 7 0 0 QX
Oct 2021 37 6 0 0 QX
Sep 2021 60 4 1 0 QX

GTF–SEA seasonal on-time pattern

Best: June (92.5%) · weakest: December (61.3%)

50%60%70%80%90%100% JanFebMarAprMayJunJulAugSepOctNovDec 61.3%

Strongest calendar month

June

92.5% on-time · ~40 flights/mo

Busiest calendar month

February

~45 flights/mo avg

Weakest calendar month

December

61.3% on-time · ~31 flights/mo

Cancellation Rate

0.4%

3 of 770 flights

Diversion Rate

0.3%

2 of 770 flights

Explore origin & destination

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

GTF - Great Falls

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

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

Compare GTF vs SEA

Origin-hub reliability standing

Among GTF's stronger departures

GTF → SEA posts a 85.7% on-time rate, landing in the ≥85% band with 3 of 4 BTS-tracked routes leaving Great Falls. The same hub also shows 1 mid-band and 0 challenged departures · fleet-wide on-time rank #986 of 4927 (highest on-time = #1).

What the Data Says About GTF to SEA

Great Falls to Seattle (GTF to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.7% on-time rate across 1,214 flights, with delays that do happen averaging 58.2 minutes. The corridor runs roughly 512 miles and is served by 2 carriers. Over the most recent 24 months, 3 of 770 flights were cancelled (0.4%) and 2 diverted (0.3%).

Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.

On the multi-year calendar, GTF–SEA peaks in June at 92.5% on-time while February carries the heaviest traffic (~45 flights per month) ; the softest month is December at 61.3%, a 31.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does GTF to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, GTF to SEA ranks #4338 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 GTF to SEA? ▼
Flights from Great Falls to Seattle have a 85.7% on-time rate based on 1,214 flights. The average delay is 58.2 minutes. The best recent month was Sep 2021 with 93% on-time.
What is the cancellation rate for GTF to SEA? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (3 of 770 flights) and 0.3% were diverted.
How far is the flight from GTF to SEA? ▼
The flight distance from Great Falls (GTF) to Seattle (SEA) is approximately 512 miles. This route is served by 2 carriers.

Airports on this route

GTF Airport

Great 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 GTF–SEA data

GTF–SEA runs 6.7 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare GTF and SEA airport profiles: delay causes and top routes differ even on the same corridor. GTF airport
  • If your dates flex, June (92.5% on-time) beats December (61.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 85.7% 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.