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Route Reliability

Portland → Ontario

PDX–ONT · 838 miles · Portland International Airport to Ontario International Airport

90
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
1 min
Average arrival delay
1.0%
Cancelled
1,129
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Alaska Airlines87%1,020 flights
  2. 2.Frontier Airlines83%109 flights

What the data says

Morning flights do better here.

PDX–ONT flights departing between 6–9 AM arrived on time 92% of the time, versus 81% between 9 PM–12 AM.

Thursday is the weak spot.

PDX–ONT flights arrived on time 91% of the time on Mondays. On Thursdays: 82%.

Alaska Airlines has a slight edge here.

Alaska Airlines arrived on time 87% of the time on this route; Frontier Airlines managed 83%.

Trending in the right direction.

PDX–ONT flights arrived on time 91% of the time over the last three months in the data, compared with 83% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon91%(180 flights)
  • Tue85%(142 flights)
  • Wed85%(142 flights)
  • Thu82%(160 flights)
  • Fri84%(173 flights)
  • Sat91%(138 flights)
  • Sun88%(181 flights)
On-time by departure window
  • 6–9 AM92%(256 flights)
  • 9 AM–12 PM87%(148 flights)
  • 12–3 PM85%(343 flights)
  • 3–6 PM89%(102 flights)
  • 6–9 PM83%(30 flights)
  • 9 PM–12 AM81%(237 flights)
On-time trend by month
90%
May

Jun 83% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%112
July 202588%117
August 202581%107
September 202583%90
October 202586%94
November 202593%94
December 202578%76
January 202685%91
February 202688%73
March 202693%84
April 202689%89
May 202690%89

Same trip, other airports

Keep nerding

Based on 1,129 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.