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Route Reliability

Seattle → Atlanta

SEA–ATL · 2,182 miles · Seattle–Tacoma International Airport to Hartsfield–Jackson Atlanta International Airport

85
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
4 min
Average arrival delay
0.7%
Cancelled
3,280
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Delta Air Lines84%2,375 flights
  2. 2.Alaska Airlines78%905 flights

What the data says

Morning-you made the right choice.

SEA–ATL flights departing between 6–9 AM arrived on time 90% of the time, versus 78% between 3–6 PM.

Friday is doing you no favors.

SEA–ATL flights arrived on time 87% of the time on Wednesdays. On Fridays: 79%.

Delta Air Lines has a slight edge here.

Delta Air Lines arrived on time 84% of the time on this route; Alaska Airlines managed 78%.

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
  • Mon81%(467 flights)
  • Tue86%(444 flights)
  • Wed87%(454 flights)
  • Thu84%(475 flights)
  • Fri79%(469 flights)
  • Sat80%(441 flights)
  • Sun79%(492 flights)
On-time by departure window
  • 6–9 AM90%(794 flights)
  • 9 AM–12 PM81%(650 flights)
  • 12–3 PM80%(266 flights)
  • 3–6 PM78%(631 flights)
  • 9 PM–12 AM80%(901 flights)
On-time trend by month
84%
May

Jun 71% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%321
July 202570%345
August 202581%313
September 202591%284
October 202586%290
November 202587%253
December 202580%265
January 202686%211
February 202692%190
March 202681%224
April 202687%249
May 202684%297

Keep nerding

Based on 3,280 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.