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Route Reliability

Ontario → Portland

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

94
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
4 min early
Average arrival delay
1.2%
Cancelled
1,128
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Alaska Airlines92%1,019 flights
  2. 2.Frontier Airlines77%109 flights

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 93% of the time, against 88% between 3–6 PM.

Thursday is the weak spot.

ONT–PDX flights arrived on time 96% of the time on Saturdays. On Thursdays: 83%.

Alaska Airlines runs this route best.

Alaska Airlines arrived on time 92% of the time on this route; Frontier Airlines managed 77%.

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
  • Mon93%(179 flights)
  • Tue90%(155 flights)
  • Wed90%(135 flights)
  • Thu83%(154 flights)
  • Fri88%(170 flights)
  • Sat96%(152 flights)
  • Sun92%(169 flights)
On-time by departure window
  • 6–9 AM91%(356 flights)
  • 9 AM–12 PM93%(256 flights)
  • 12–3 PM88%(162 flights)
  • 3–6 PM88%(209 flights)
  • 6–9 PM90%(131 flights)
On-time trend by month
88%
May

Jun 91% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%112
July 202589%116
August 202588%106
September 202591%91
October 202585%94
November 202594%94
December 202588%75
January 202693%91
February 202696%74
March 202690%83
April 202693%87
May 202688%91

Same trip, other airports

Keep nerding

Based on 1,128 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.