71% of flights from Fort Lauderdale to Seattle arrived on time over the past 12 months. That is worse than the typical U.S. route. The 8 a.m. departures ran on time 76% of the time; the 6 p.m. ones 67%. Most reliable airline: Delta Air Lines (78%). 8% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for FLL → SEA: when a flight was late, it was under 45 minutes late 66% of the time. About 1 in 19 flights landed an hour or more late, and 1 in 118 three hours or more; 1.2% were cancelled outright.
- On time or early71%
- 15–30 min late12%
- 30–60 min late8.6%
- 1–2 hours late3.5%
- 2–3 hours late0.8%
- 3+ hours late0.8%
- Diverted1.3%
- Cancelled1.2%
Share of all 826 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Alaska Airlines | 462 | 66% | 1.1% | +2 min | 5.6% | +50 min | Alaska Airlines |
| Delta Air Lines | 364 | 78% | 1.4% | −7 min | 4.7% | +58 min | Delta Air Lines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at FLL). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Alaska Airlines | Delta Air Lines |
|---|---|---|
| 7 a.m. | 65% | — |
| 8 a.m. | — | 76% |
| 6 p.m. | 67% | — |
By month
Each calendar month pooled over 2023–2026. Best: October (86%). Worst: December (62%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 123 | 71% | 2.4% |
| Tuesday | 115 | 70% | 0.9% |
| Wednesday | 114 | 75% | 0.0% |
| Thursday | 117 | 80% | 0.0% |
| Friday | 120 | 71% | 0.0% |
| Saturday | 121 | 73% | 3.3% |
| Sunday | 116 | 60% | 1.7% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 7 · weather 3
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 356 | 8:35 a.m. | 255 | 80% | 1.6% | −8 min | Delta Air Lines |
| AS 517 | 6:30 p.m. | 317 | 65% | 0.9% | +3 min | Alaska Airlines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Dec 19, 2025 | 3 | 0% | 0 |
| Jan 6, 2026 | 3 | 0% | 0 |
| Feb 27, 2026 | 3 | 0% | 0 |
| Feb 22, 2026 | 3 | 0% | 0 |
| Mar 13, 2026 | 3 | 0% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Fort Lauderdale or Seattle. None has been clearly more reliable than FLL → SEA.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| FLL → SEA (this route) | 826 | 71% | 1.2% |
| MIA → SEA Miami to Seattle-Tacoma | 1,233 | 68% | 1.1% |
Questions
How often are flights from FLL to SEA on time?
71% of 826 scheduled flights from Fort Lauderdale, FL to Seattle, WA arrived within 15 minutes of schedule between September 2025 and August 2026. 1.2% were cancelled.
What is the best time of day to fly FLL to SEA?
Flights scheduled to leave at 8 a.m. were the most reliable (76% on time). The 6 p.m. departures were the least (67%).
Which airline is most on time from FLL to SEA?
Delta Air Lines: 78% of its 364 flights on the route arrived on time. Alaska Airlines: 66%.
What month has the most delays from FLL to SEA?
December (62% on time). The best month is October (86%), over 2023–2026.
Related
- SEA → FLL (return)
- Fort Lauderdale (FLL) delays by hour
- Flights into Seattle-Tacoma (SEA)
- Alaska Airlines on-time record
- Delta Air Lines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.