Best Time to Fly STL to SEA
St. Louis to Seattle — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
January
1% on time
Worst month
January
1% on time
STL → SEA on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| January | 1% | 0% | 141 |
| February | 1% | 0% | 152 |
| March | 1% | 0% | 215 |
| April | 1% | 0% | 237 |
| May | 1% | 0% | 311 |
| June | 1% | 0% | 440 |
| July | 1% | 0% | 459 |
| August | 1% | 0% | 314 |
| September | 1% | 0% | 287 |
| October | 1% | 0% | 184 |
| November | 1% | 0% | 158 |
| December | 1% | 0% | 164 |
Frequently asked
What is the best month to fly from STL to SEA?
January has the highest on-time rate at 1% for flights from St. Louis to Seattle.
What is the worst month to fly STL to SEA?
January has the lowest on-time rate at 1%, often due to winter weather.
How often are STL to SEA flights delayed?
On average, 1% of flights from STL to SEA arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.