Route · PDX → ONT · 2020–2025 BTS data
Portland to Ontario
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PDX to ONT (Portland to Ontario) ranks #3522 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 87.3%
- On-time
- +8.3 pts
- vs US avg
- 64 min
- Delay when late
- 2,522
- Flights
- #3522 of 4927
- Corpus placement
Cancelled
1.9%
Best Month
Mar 2025 98%
Worst Month
Aug 2024 79%
Distance
838 mi
Carriers
25
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 45 | 14 | 0 | 0 | F9,AS |
| Nov 2025 | 67 | 9 | 1 | 0 | F9,AS |
| Oct 2025 | 44 | 4 | 1 | 0 | AS,OO,F9 |
| Sep 2025 | 60 | 9 | 0 | 0 | OO,F9,AS |
| Aug 2025 | 40 | 10 | 0 | 0 | OO,F9,AS |
| Apr 2025 | 41 | 5 | 0 | 0 | OO,AS |
| Mar 2025 | 55 | 1 | 0 | 0 | AS,OO |
| Feb 2025 | 58 | 7 | 4 | 0 | AS,OO,F9 |
| Jan 2025 | 86 | 12 | 2 | 1 | AS,OO,WN,F9 |
| Dec 2024 | 52 | 6 | 0 | 0 | AS,F9,WN |
| Nov 2024 | 58 | 10 | 0 | 0 | WN,AS,F9 |
| Oct 2024 | 69 | 7 | 0 | 0 | AS,F9 |
| Sep 2024 | 58 | 11 | 0 | 0 | WN,AS,F9 |
| Aug 2024 | 84 | 18 | 1 | 0 | AS,F9,WN,OO |
| Jul 2024 | 67 | 10 | 2 | 0 | F9,OO,WN |
| Jun 2024 | 70 | 12 | 2 | 1 | F9,OO,WN |
| May 2024 | 84 | 7 | 1 | 0 | F9,OO,WN |
| Apr 2024 | 89 | 11 | 0 | 0 | F9,OO,WN |
| Mar 2024 | 54 | 4 | 0 | 0 | OO,WN |
| Jan 2024 | 32 | 5 | 11 | 0 | AS,WN,OO |
| Dec 2023 | 33 | 7 | 0 | 0 | OO,WN,AS |
| Nov 2023 | 34 | 5 | 0 | 0 | AS,OO,WN |
| Oct 2023 | 35 | 3 | 0 | 0 | AS,WN |
| May 2023 | 31 | 6 | 0 | 0 | AS |
PDX–ONT seasonal on-time pattern
Best: March (94.5%) · weakest: August (76.3%)
Strongest calendar month
March
94.5% on-time · ~54 flights/mo
Busiest calendar month
February
~68 flights/mo avg
Weakest calendar month
August
76.3% on-time · ~47 flights/mo
Cancellation Rate
1.9%
25 of 1,346 flights
Diversion Rate
0.1%
2 of 1,346 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
PDX - Portland
Full on-time, delay-cause, and seasonal performance for Portland, OR.
PDX on-time profileONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
ONT on-time profileCompare the two airports
See PDX and ONT side by side on delays, cancellations, and reliability.
Compare PDX vs ONTOrigin-hub reliability standing
Among PDX's stronger departures
PDX → ONT posts a 87.3% on-time rate, landing in the ≥85% band with 26 of 44 BTS-tracked routes leaving Portland. The same hub also shows 17 mid-band and 1 challenged departures · fleet-wide on-time rank #573 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to PDX–ONT.
Routes with a similar on-time rate
What the Data Says About PDX to ONT
Portland to Ontario (PDX to ONT) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.3% on-time rate across 2,522 flights, with delays that do happen averaging 63.9 minutes. The corridor runs roughly 838 miles and is served by 25 carriers. Over the most recent 24 months, 25 of 1,346 flights were cancelled (1.9%) and 2 diverted (0.1%).
The monthly split is wide on this route: Mar 2025 posted the strongest performance at 98% on-time, while Aug 2024 came in at just 79% - a 20-point swing worth factoring into travel timing.
On the multi-year calendar, PDX–ONT peaks in March at 94.5% on-time while February carries the heaviest traffic (~68 flights per month) ; the softest month is August at 76.3%, a 18.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does PDX to ONT rank among US routes by traffic? ▼
How often are flights delayed from PDX to ONT? ▼
What is the cancellation rate for PDX to ONT? ▼
How far is the flight from PDX to ONT? ▼
When is the best time to fly from PDX to ONT? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using PDX–ONT data
PDX–ONT runs 8.3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare PDX and ONT airport profiles: delay causes and top routes differ even on the same corridor. PDX airport
- If your dates flex, March (94.5% on-time) beats August (76.3%) on this corridor. Seasonal chart
- 4 other routes post a similar 87.3% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.