Route on-time record
SEA to TPA: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Tampa (Tampa International Airport). 976 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was Alaska 639 at 11:10 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → TPA
Seattle to Tampa: 976 nonstop flights a year
On time (12 months)
76%
Cancelled
0.6%
avg delay 13 min
Best time to leave
Before 9 AM
94% on time vs 71% after 9 PM
Most reliable airline
Alaska
76% chance on time
Lowest nonstop fare seen in the next two months: $423 (Alaska 326 on 2026-11-03). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Alaska 639
11:10 PM → 7:34 AM5h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 84% of the time (143 flights, Jun 2025 to May 2026).
- Never cancelled in 143 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 71% on time; Before 9 AM: 94%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 143 flights
Find Alaska 639 fares Opens this date on Aviasales#2 · Alaska 326
8:10 AM → 4:41 PM5h 31m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.8%
- Avg arrival delay
- 11 min
- Arrived on time 80% of the time (355 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; After 9 PM: 71%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside TPA's trouble window: 76% of its 25 ground stops and delay programs started between noon and 6 PM.
Strong track record · 355 flights
Find Alaska 326 fares Opens this date on Aviasales#3 · Delta 358
11:55 AM → 8:13 PM5h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 74%
- Cancelled
- 0.6%
- Avg arrival delay
- 16 min
- Arrived on time 74% of the time (356 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 356 flights
Find Delta 358 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines76%
613 flights · 77% on time as flown · 0.6% cancel
- Delta Air Lines74%
363 flights · 74% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
54 flights · avg delay 4 min
- 9 AM to noon75%
624 flights · avg delay 15 min
- Noon to 3 PM86%
49 flights · avg delay 7 min
- After 9 PM71%
249 flights · avg delay 13 min
Best day: Tuesday (79%). Worst: Sunday (73%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)46%
- Late-arriving aircraft26%
- Air traffic control and airport volume22%
- Severe weather6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SEA to TPA questions
- What time of day is best to fly SEA to TPA?
- Before 9 AM: 94% of flights arrived on time, against 71% for departures after 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SEA to TPA?
- Alaska, with a season-adjusted 76% chance of operating and arriving on time over 613 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SEA to TPA?
- July (64% on time); the best was November (86%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SEA
- TPA to SEA (return)
- SEA to LAX 83%
- SEA to PHX 79%
- SEA to SFO 69%
- SEA to ANC 74%
- SEA to DEN 77%
- SEA to LAS 77%
- SEA to ORD 75%
- SEA to GEG 81%
- SEA to DFW 77%
- SEA to PDX 82%
- SEA to SAN 78%
- SEA to SMF 81%
Most on-time flights from SEA on every route →
Live status: FAA delays and ground stops