Fort Lauderdale (FLL) to Seattle (SEA): On-Time Performance
Data through May 2026
When you fly FLL to SEA matters as much as anything else about the booking: the route swung from 90% on-time in October 2024 to just 47% in December 2025. Across the full period the route averages 71% on-time against a national 78%.
- On-time
- 71%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 2.3
- last 12 months
- Duration
- 6h 42m
- scheduled
- Distance
- 2,717 mi
Best airline from FLL to SEA
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 72% | 20 min | 1.4% | 727 |
| Alaska Airlines | 70% | 17 min | 1.3% | 968 |
Monthly on-time trend
Best time to fly from FLL to SEA
Aim for departures around 10 a.m. (87% on-time); avoid 5 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 70% | 19 min |
| Tuesday | 71% | 19 min |
| Wednesday | 69% | 20 min |
| Thursday | 75% | 15 min |
| Friday | 70% | 17 min |
| Saturdaybest | 78% | 13 min |
| Sunday | 63% | 24 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations28%
- National airspace system25%
- Weather6%
- Security1%
Frequently asked questions
- How often are flights from FLL to SEA delayed?
- 29% of FLL–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from FLL to SEA?
- Delta Air Lines has the best on-time record on this route at 72%, based on 727 flights. 2 airlines flew FLL–SEA frequently enough to compare in this period.
- What is the best time of day to fly from FLL to SEA?
- Departures around 10 a.m. have the best record (87% on-time), while departures around 5 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from FLL to SEA?
- The scheduled FLL–SEA flight time averages 6h 42m over 2,717 miles. Actual arrival times vary — flights on this route land 15+ minutes late 29% of the time.
- How often are FLL to SEA flights cancelled?
- 1.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from FLL to SEA?
- December 2025 was the roughest month in this dataset, with only 47% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 43-point gap is worth planning around.
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Based on 1,695 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.