Portland (PDX) to St Louis (STL) flights
Alaska Airlines, Southwest Airlines fly nonstop from Portland International Airport to St. Louis Lambert International Airport, with about 8 flights a week in July 2026. The 1,708-mile flight takes about 3h 49m gate to gate.
- Distance
- 1,708 mi · 2,749 km
- Flight time
- 3h 49m
- Airlines
- 2
- Seats filled
- 86%
Airlines flying PDX to STL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Alaska Airlines | 7 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 11,319 | 3h 54m |
| Southwest Airlines | 2 | Boeing 737-700 / MAX 7, Boeing 737-800, Boeing 737 MAX 8 | 5,286 | 3h 38m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
PDX to STL flight schedule
4 flight numbers flew this route in August 2026. The first usually leaves at 9:45am and the last at 12:25pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| WN 400Southwest Airlines | 9:45am | 3:30pm | 4 | n/a |
| AS 1635Alaska Airlines | 10:49am | 4:37pm | 18 | 74% |
| AS 1318Alaska Airlines | 11:16am | 5:10pm | 13 | 92% |
| WN 3199Southwest Airlines | 12:25pm | 6:10pm | 4 | n/a |
Is PDX to STL on time?
From September 2025 to August 2026, 78% of 145 flights arrived within 15 minutes of schedule and 0.7% were cancelled. Flights leaving around 11am were the most punctual (88%), those around 10am the least (76%). Most delay time was caused by air traffic control and airport congestion (40%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 111 | 79% | 9 min | 0.9% |
| Southwest Airlines | 34 | 74% | 10 min | 0% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 10 | 1,536 | |
| September 2025 | 8 | 1,233 | |
| November 2025 | 1 | 78 | |
| May 2026 | 19 | 2,552 | |
| June 2026 | 38 | 5,883 | |
| July 2026 | 37 | 5,323 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.