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Route Reliability

Raleigh–Durham → Chicago

RDU–ORD · 646 miles · Raleigh–Durham International Airport to Chicago O'Hare International Airport

70
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
16 min
Average arrival delay
2.1%
Cancelled
3,534
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.United Airlines78%1,443 flights
  2. 2.American Airlines74%1,942 flights
  3. 3.Frontier Airlines55%149 flights

What the data says

Morning-you made the right choice.

RDU–ORD flights departing between 3–6 AM arrived on time 92% of the time, versus 44% between 9 PM–12 AM.

Friday is doing you no favors.

RDU–ORD flights arrived on time 79% of the time on Tuesdays. On Fridays: 71%.

United Airlines has a clear lead on this route.

United Airlines arrived on time 78% of the time on this route; Frontier Airlines managed 55%.

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
  • Mon74%(534 flights)
  • Tue79%(447 flights)
  • Wed77%(468 flights)
  • Thu74%(526 flights)
  • Fri71%(520 flights)
  • Sat78%(412 flights)
  • Sun72%(535 flights)
On-time by departure window
  • 3–6 AM92%(102 flights)
  • 6–9 AM89%(767 flights)
  • 9 AM–12 PM88%(596 flights)
  • 12–3 PM77%(698 flights)
  • 3–6 PM59%(895 flights)
  • 6–9 PM57%(352 flights)
  • 9 PM–12 AM44%(32 flights)
On-time trend by month
82%
May

Jun 73% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%270
July 202565%267
August 202576%262
September 202584%266
October 202572%326
November 202576%297
December 202573%287
January 202676%213
February 202680%240
March 202669%301
April 202672%345
May 202682%368

Same trip, other airports

Keep nerding

Based on 3,534 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.