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Route Reliability

San Diego → Seattle

SAN–SEA · 1,050 miles · San Diego International Airport to Seattle–Tacoma International Airport

82
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
3 min
Average arrival delay
1.7%
Cancelled
4,573
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 Lines88%1,698 flights
  2. 2.Alaska Airlines78%2,787 flights

Not enough history to rank: Southwest Airlines (88 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning flights do better here.

SAN–SEA flights departing between 6–9 AM arrived on time 87% of the time, versus 69% between 9 PM–12 AM.

Friday is doing you no favors.

SAN–SEA flights arrived on time 87% of the time on Tuesdays. On Fridays: 75%.

Delta Air Lines runs this route best.

Delta Air Lines arrived on time 88% 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%(687 flights)
  • Tue87%(634 flights)
  • Wed85%(626 flights)
  • Thu79%(672 flights)
  • Fri75%(655 flights)
  • Sat84%(543 flights)
  • Sun80%(675 flights)
On-time by departure window
  • 6–9 AM87%(982 flights)
  • 9 AM–12 PM85%(869 flights)
  • 12–3 PM80%(866 flights)
  • 3–6 PM79%(906 flights)
  • 6–9 PM76%(853 flights)
  • 9 PM–12 AM69%(16 flights)
On-time trend by month
85%
May

Jun 74% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%420
July 202576%435
August 202570%417
September 202585%383
October 202583%340
November 202580%314
December 202579%345
January 202687%331
February 202692%303
March 202680%378
April 202689%407
May 202685%419

Same trip, other airports

Keep nerding

Based on 4,573 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.