Schedule: a typical summer Friday (the flights of Jul 31, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

DELTA · FLIGHT DL 637 SCHEDULED · TYPICAL SCHEDULE

Friday, October 2

DL 637 · ORD → SEA

departs 5:55 PM CT · arrives 8:34 PM PT

Forecast issued Fri 10:00 PM ET · 3h after departure

Arrive at SEA more than 15 minutes late?

31% chance · ±1 pts +2 pts · 24h

HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.

How late will it get to SEA?

On time or early
68%
15–30 min late
11%
30 min–1 hour late
14%
1–2 hours late
4%
Over 2 hours late
2%
Cancelled
<1%

Gate arrival compared with the scheduled arrival. The ranges add up to 100%.

What’s moving the odds

↑ 5pm departures from ORD are often late

↑ This flight has been late 36% of the time recently

↑ Arrivals into SEA at that hour are often late

↓ Other factors

↓ Mostly benign weather forecast at ORD

Weather at each end

ORD (origin) Gusts16 kt Ceiling2,800 ft Visibility9 mi Precip0.10 in

SEA (destination) Gusts10 kt Ceiling1,500 ft Visibility10+ mi Precipnone

How this resolves

Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.

Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.

DL 637 · ORD → SEA

Odds over time

How late will it get to SEA?