SEA to FLL flight delays
Seattle, WA (SEA) Fort Lauderdale, FL (FLL) · 2,717 miles
826 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
78.08%
Arrived on time
Within 15 minutes of schedule
0.97%
Cancelled
Share of scheduled flights
50 min
When late, late by
Average across delayed arrivals
12 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. Alaska Airlines arrived on time 7.6 points more often than Delta Air Lines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In September it ran 27.4 points more punctual than in December — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. FLL to SEA arrives on time 8.3 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
The Seattle to Fort Lauderdale route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, Alaska Airlines arrived on time most often on SEA to FLL. Delta Air Lines was late most often. Flights ran closest to schedule in September and worst in December.
Every airline on SEA to FLL
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 462 | 81.4% | 0.43% | 46 min | B |
| Delta Air Lines | 364 | 73.8% | 1.65% | 53 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
FLL to SEA Fort Lauderdale back to Seattle 69.74% on time DOther routes from Seattle
Common questions
Are flights from Seattle to Fort Lauderdale usually delayed?
78.08% of flights on the SEA to FLL route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Seattle to Fort Lauderdale?
Alaska Airlines, at 81.4% on time across 462 flights. The least punctual on the route was Delta Air Lines at 73.8%.
How often are SEA to FLL flights cancelled?
0.97% of scheduled flights did not operate — about 10 in every thousand. That is in the normal range.
What is the best month to fly Seattle to Fort Lauderdale?
September, when 91.5% of flights arrived on time. The worst was December at 64.1%.
When SEA to FLL flights are late, how late are they?
About 50 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SEA to FLL during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →