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Route · FLL → SEA · 2020–2025 BTS data

Fort Lauderdale to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), FLL to SEA (Fort Lauderdale to Seattle) ranks #2729 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

75%
On-time
-4 pts
vs US avg
67 min
Delay when late
4,396
Flights
#2729 of 4927
Corpus placement

Cancelled

2.3%

Best Month

Oct 2024 90%

Worst Month

Dec 2025 52%

Distance

2,717 mi

Carriers

5

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 93 45 1 4 DL,AS
Nov 2025 65 18 1 1 AS,DL
Oct 2025 62 13 0 0 AS,DL
Sep 2025 60 15 1 0 DL,AS
Aug 2025 62 28 0 0 AS,DL
Jul 2025 62 22 3 1 AS,DL
Jun 2025 60 24 1 0 AS,DL
May 2025 73 20 0 0 AS,DL
Apr 2025 83 18 0 0 AS,DL
Mar 2025 87 20 1 1 AS,DL
Feb 2025 76 20 1 0 AS,DL
Jan 2025 85 27 0 1 AS,DL
Dec 2024 93 32 0 2 AS,DL
Nov 2024 67 11 1 0 AS,DL
Oct 2024 61 6 1 0 AS,DL
Sep 2024 60 12 0 0 AS,DL
Aug 2024 62 15 2 1 AS,DL
Jul 2024 62 13 2 0 AS,DL
Jun 2024 60 14 2 1 AS,DL
May 2024 77 19 0 3 AS,DL
Apr 2024 90 38 0 2 AS,DL
Mar 2024 93 36 0 3 AS,DL
Feb 2024 87 16 0 1 AS,DL
Jan 2024 93 16 24 2 AS,DL

FLL–SEA seasonal on-time pattern

Best: October (86.1%) · weakest: December (67.4%)

65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 67.4%

Strongest calendar month

October

86.1% on-time · ~54 flights/mo

Busiest calendar month

March

~81 flights/mo avg

Weakest calendar month

December

67.4% on-time · ~80 flights/mo

Cancellation Rate

2.3%

41 of 1,773 flights

Diversion Rate

1.3%

23 of 1,773 flights

Explore origin & destination

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

FLL - Fort Lauderdale

Full on-time, delay-cause, and seasonal performance for Fort Lauderdale, FL.

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

Compare FLL vs SEA

Origin-hub reliability standing

Mid-pack among FLL departures

From FLL, this corridor sits with 32 other 75–85% on-time routes out of 62 tracked departures, not the hub's reliability leaders (1 at ≥85%) and not the softest ( 29 below 75%). Destination: Seattle · fleet on-time rank #4466 of 4927.

What the Data Says About FLL to SEA

The Fort Lauderdale to Seattle corridor (FLL to SEA) posts a 75% on-time rate on the lower edge of the average band, based on 4,396 tracked flights. Late flights run 67.3 minutes behind on average. 5 carriers cover the 2,717-mile route; over the last 24 months, 41 of 1,773 flights were cancelled (2.3%) and 1.3% diverted.

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 90% on-time, while Dec 2025 came in at just 52% - a 39-point swing worth factoring into travel timing.

On the multi-year calendar, FLL–SEA peaks in October at 86.1% on-time while March carries the heaviest traffic (~81 flights per month) ; the softest month is December at 67.4%, a 18.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does FLL to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, FLL to SEA ranks #2729 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 FLL to SEA? ▼
Flights from Fort Lauderdale to Seattle have a 75% on-time rate based on 4,396 flights. The average delay is 67.3 minutes. The best recent month was Oct 2024 with 90% on-time.
What is the cancellation rate for FLL to SEA? ▼
Over the last 24 months, 2.3% of flights on this route were cancelled (41 of 1,773 flights) and 1.3% were diverted.
How far is the flight from FLL to SEA? ▼
The flight distance from Fort Lauderdale (FLL) to Seattle (SEA) is approximately 2,717 miles. This route is served by 5 carriers.
When is the best time to fly from FLL to SEA? ▼
The best recent month for on-time performance was Oct 2024 (90% on-time). The worst was Dec 2025 (52% on-time). Consider booking during months with historically better performance.

Airports on this route

FLL Airport

Fort Lauderdale
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 FLL–SEA data

FLL–SEA is mid-pack at 75% on-time; month and carrier mix move more than the corridor headline.

  • Compare FLL and SEA airport profiles: delay causes and top routes differ even on the same corridor. FLL airport
  • If your dates flex, October (86.1% on-time) beats December (67.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 75% 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.