How reliable is Portland International Jetport Airport?
Flights from PWM departed within 15 minutes of schedule in 83% of 71,937 flights in official BTS history — and weather is calmest in Nov. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the departure punctuality at PWM looks like
On-time departures
across 71,937 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
Advertisement
Weather by month
When the weather works for you at Portland
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 91/100 favorability
Roughest month
Most disruptive — low visibility & fog, snow · 80/100 favorability
The read on PWM
What the numbers say about flying through Portland International Jetport Airport
Across official performance history, flights from Portland left within 15 minutes of schedule about 83% of the time over 71,937 flights. That's a solid, better-than-average operational record. Pair it with an elevated cancellation rate of 2.9% — worth weighing alongside the on-time figure. When a departure does run late, the typical delay is around 13 minutes.
On weather, Portland is an unusually calm-weather airport year-round. November is the calmest stretch for flying, scoring 91 out of 100 for favorable conditions, while December is the most disruptive at 80, driven mainly by low visibility & fog and snow. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Portland, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about PWM
- How reliable is Portland International Jetport Airport (PWM)?
- Flights from Portland left within 15 minutes of schedule roughly 83% of the time across 71,937 flights of official history — a solid, better-than-average operational record. The cancellation rate runs about 2.9%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from PWM for good weather?
- November has the calmest flying weather at Portland International Jetport Airport. December is the most disruptive, mainly from low visibility & fog and snow.
Planning a trip through Portland?
Score real flights to and from PWM on reliability, weather, and connection safety — not just price.