Best Time to Fly PDX to STL
Portland to St. Louis — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
May
1% on time
Worst month
May
1% on time
PDX → STL on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| May | 1% | 0% | 19 |
| June | 1% | 0% | 38 |
| July | 1% | 0% | 39 |
| August | 1% | 0% | 31 |
| September | 1% | 0% | 22 |
Frequently asked
What is the best month to fly from PDX to STL?
May has the highest on-time rate at 1% for flights from Portland to St. Louis.
What is the worst month to fly PDX to STL?
May has the lowest on-time rate at 1%, often due to seasonal weather patterns.
How often are PDX to STL flights delayed?
On average, 1% of flights from PDX to STL arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.