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Route · ONT → PDX · 2020–2025 BTS data

Ontario to Portland

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ONT to PDX (Ontario to Portland) ranks #3521 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

89.3%
On-time
+10.3 pts
vs US avg
58 min
Delay when late
2,523
Flights
#3521 of 4927
Corpus placement

Cancelled

1.6%

Best Month

Mar 2025 100%

Worst Month

Oct 2024 72%

Distance

838 mi

Carriers

25

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 44 5 0 0 F9,AS
Nov 2025 67 6 1 0 F9,AS
Oct 2025 43 9 1 0 AS,OO,F9
Sep 2025 61 5 0 0 OO,F9,AS
Aug 2025 39 9 0 0 OO,F9,AS
Apr 2025 42 0 0 0 OO,AS
Mar 2025 54 0 0 1 AS,OO
Feb 2025 59 7 2 0 AS,OO,F9
Jan 2025 86 12 3 0 AS,OO,WN,F9
Dec 2024 52 11 0 0 AS,F9,WN
Nov 2024 58 6 1 0 WN,AS,F9
Oct 2024 69 19 0 0 AS,F9
Sep 2024 58 4 0 0 WN,AS,F9
Aug 2024 85 9 0 0 AS,F9,WN,OO
Jul 2024 66 11 2 0 F9,OO,WN
Jun 2024 71 12 0 0 F9,OO,WN
May 2024 84 11 1 0 F9,OO,WN
Apr 2024 89 11 0 0 F9,OO,WN
Mar 2024 53 8 0 0 OO,WN
Jan 2024 33 5 11 0 AS,WN,OO
Dec 2023 33 5 0 0 OO,WN,AS
Nov 2023 34 3 0 0 AS,OO,WN
Oct 2023 35 2 0 0 AS,WN
May 2023 31 5 0 0 AS

ONT–PDX seasonal on-time pattern

Best: March (93.4%) · weakest: October (83.3%)

80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 85.1%

Strongest calendar month

March

93.4% on-time · ~54 flights/mo

Busiest calendar month

February

~68 flights/mo avg

Weakest calendar month

October

83.3% on-time · ~51 flights/mo

Cancellation Rate

1.6%

22 of 1,346 flights

Diversion Rate

0.1%

1 of 1,346 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

ONT - Ontario

Full on-time, delay-cause, and seasonal performance for Ontario, CA.

ONT on-time profile

PDX - Portland

Full on-time, delay-cause, and seasonal performance for Portland, OR.

PDX on-time profile

Compare the two airports

See ONT and PDX side by side on delays, cancellations, and reliability.

Compare ONT vs PDX

Origin-hub reliability standing

Among ONT's stronger departures

ONT → PDX posts a 89.3% on-time rate, landing in the ≥85% band with 10 of 21 BTS-tracked routes leaving Ontario. The same hub also shows 9 mid-band and 2 challenged departures · fleet-wide on-time rank #212 of 4927 (highest on-time = #1).

What the Data Says About ONT to PDX

Ontario to Portland (ONT to PDX) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 89.3% on-time rate across 2,523 flights, with delays that do happen averaging 57.8 minutes. The corridor runs roughly 838 miles and is served by 25 carriers. Over the most recent 24 months, 22 of 1,346 flights were cancelled (1.6%) and 1 diverted (0.1%).

The monthly split is wide on this route: Mar 2025 posted the strongest performance at 100% on-time, while Oct 2024 came in at just 72% - a 28-point swing worth factoring into travel timing.

On the multi-year calendar, ONT–PDX peaks in March at 93.4% on-time while February carries the heaviest traffic (~68 flights per month) ; the softest month is October at 83.3%, a 10.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ONT to PDX rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ONT to PDX ranks #3521 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from ONT to PDX? ▼
Flights from Ontario to Portland have a 89.3% on-time rate based on 2,523 flights. The average delay is 57.8 minutes. The best recent month was Mar 2025 with 100% on-time.
What is the cancellation rate for ONT to PDX? ▼
Over the last 24 months, 1.6% of flights on this route were cancelled (22 of 1,346 flights) and 0.1% were diverted.
How far is the flight from ONT to PDX? ▼
The flight distance from Ontario (ONT) to Portland (PDX) is approximately 838 miles. This route is served by 25 carriers.
When is the best time to fly from ONT to PDX? ▼
The best recent month for on-time performance was Mar 2025 (100% on-time). The worst was Oct 2024 (72% on-time). Consider booking during months with historically better performance.

Airports on this route

ONT Airport

Ontario
PDX Airport

Portland
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 ONT–PDX data

ONT–PDX runs 10.3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare ONT and PDX airport profiles: delay causes and top routes differ even on the same corridor. ONT airport
  • If your dates flex, March (93.4% on-time) beats October (83.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 89.3% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.