St. Louis (STL) to Portland (PDX): On-Time Performance
Data through July 2026
St. Louis (STL) to Portland (PDX) is a thinner route than most in this dataset — 114 departures over the past year, roughly 2 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 74% arrived on time.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 10 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 0.31
- last 12 months
- Duration
- 4h 8m
- scheduled
- Distance
- 1,708 mi
Best airline from STL to PDX
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlinesmost reliable | 89% | 4 min | 2.5% | 80 |
| Southwest Airlines | 62% | 15 min | 1.0% | 101 |
Monthly on-time trend
Best time to fly from STL to PDX
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 90% | 6 min |
| Tuesdaybest | 91% | 2 min |
| Wednesday | 82% | 7 min |
| Thursday | 80% | 18 min |
| Friday | 80% | 6 min |
| Saturday | 69% | 10 min |
| Sunday | 60% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft37%
- Airline operations22%
- National airspace system19%
- Weather20%
- Security2%
Frequently asked questions
- How often are flights from STL to PDX delayed?
- 26% of STL–PDX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 10 minutes.
- Which airline is most reliable from STL to PDX?
- Alaska Airlines has the best on-time record on this route at 89%, based on 80 flights. 2 airlines flew STL–PDX frequently enough to compare in this period.
- How long is the flight from STL to PDX?
- The scheduled STL–PDX flight time averages 4h 8m over 1,708 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are STL to PDX flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
Explore related pages
More routes from STL
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Related guides
Based on 181 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.