Best Time to Fly MDW to PDX: On-Time Stats by Hour & Airline
Chicago Midway International → Portland International
Data through July 2026 · Last updated October 18, 2026
683 flights were scheduled from Chicago (MDW) to Portland (PDX) in the last 12 months, and 61.6% of those that flew arrived on time, 16.0 points below the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (74% on time) and March the worst month (52%).
The cancellation rate was 1.0% (US average 1.8%).
MDW to PDX on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 61.6% | 52 min | 1.0% | 683 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to PDX
On-time arrival % by scheduled departure hour (local time), 1,283 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 68.6% | 0.0% | 70 |
| 8am–9am | 79.1% | 0.0% | 116 |
| 9am–10am | 75.0% | 0.0% | 76 |
| 10am–11am | 77.2% | 0.6% | 168 |
| 11am–12pm | Limited data | 9 | |
| 12pm–1pm | Limited data | 9 | |
| 1pm–2pm | Limited data | 1 | |
| 2pm–3pm | 68.6% | 1.4% | 71 |
| 3pm–4pm | 69.3% | 0.0% | 88 |
| 4pm–5pm | 62.2% | 0.0% | 157 |
| 5pm–6pm | Limited data | 29 | |
| 6pm–7pm | 66.7% | 0.0% | 48 |
| 7pm–8pm | 63.6% | 0.0% | 55 |
| 8pm–9pm | 63.0% | 0.0% | 154 |
| 9pm–10pm | 49.3% | 3.3% | 151 |
| 10pm–11pm | 54.3% | 0.0% | 81 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDW to PDX
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 50.0% | -19.6 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 57.6% | -12.0 pts | 0.6% | 346 |
| All other days | 69.6% | — | 0.5% | 893 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).