BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
CHS→SEA

Charleston, SC (CHS) to Seattle, WA (SEA) flight delay odds

70.6% of 347 official scheduled CHS-to-SEA flights arrived on time; 12.4% arrived at least 30 minutes late and 0.9% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
70.6%arrived on time
12.4%30+ min late
0.9%cancelled
347scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.5%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+7.5 mincompleted flights

Which departure time was most reliable for CHS to SEA?

Only Evening met the CHS-to-SEA departure window threshold: 70.6% of 347 scheduled flights arrived on time during July 2025–June 2026.

Departure windowFlightsOn time30+ minCancelled
Evening34770.6%12.4%0.9%

Which weekday was most reliable for CHS to SEA?

Among qualifying CHS-to-SEA weekday results, Saturday had the highest on-time rate: 79.5% of 44 flights. Monday was lowest at 65.4% across 52 flights.

DayFlightsOn time30+ minCancelled
Monday5265.4%13.5%0.0%
Tuesday4470.5%11.4%2.3%
Wednesday5271.2%13.5%0.0%
Thursday5166.7%13.7%2.0%
Friday5275.0%17.3%0.0%
Saturday4479.5%2.3%2.3%
Sunday5267.3%13.5%0.0%

Which airline was most reliable for CHS to SEA?

Only Alaska Airlines met the CHS-to-SEA airline threshold: 70.6% of 347 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines34770.6%12.4%0.9%

Which month was most reliable for CHS to SEA?

Among qualifying CHS-to-SEA month results, February 2026 had the highest on-time rate: 84.0% of 25 flights. July 2025 was lowest at 45.2% across 31 flights.

MonthFlightsOn time30+ minCancelled
July 20253145.2%22.6%3.2%
August 20253171.0%6.5%0.0%
September 20253083.3%10.0%0.0%
October 20253066.7%23.3%3.3%
November 20252369.6%13.0%0.0%
December 20253154.8%22.6%0.0%
January 20262462.5%8.3%0.0%
February 20262584.0%4.0%0.0%
March 20263174.2%9.7%0.0%
April 20263076.7%3.3%0.0%
May 20263177.4%12.9%3.2%
June 20263083.3%10.0%0.0%

What drove CHS to SEA delay minutes?

National airspace was the largest recorded CHS-to-SEA delay category, accounting for 39.3% of 3,884 BTS-attributed delay minutes during July 2025–June 2026.

Airline14.8%
Late aircraft37.7%
National airspace39.3%
Weather5.9%
Security2.2%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.