Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

UNITED · FLIGHT UA 1218 SCHEDULED · TYPICAL SCHEDULE

Monday, October 5 Tomorrow

UA 1218 · SEA → DEN

departs 7:54 PM PT · arrives 11:38 PM MT

Forecast issued Sun 3:00 PM ET · 32h before departure

Arrive at DEN more than 15 minutes late?

21% chance · ±1 pts +9 pts · 24h

HOW SURE WE ARE Moderate. The odds now blend history with early weather forecasts.

How late will it get to DEN?

On time or early
79%
15–30 min late
10%
30 min–1 hour late
4%
1–2 hours late
5%
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

↑ 7pm departures from SEA are often late

↑ Arrivals into DEN at that hour are often late

↑ Later flights pick up delays from earlier in the day

↓ Mostly benign weather forecast at DEN

↓ Mondays in October are usually quieter than average

Weather at each end

SEA (origin) Gusts6 kt Ceiling300 ft Visibility0.2 mi Precipnone

DEN (destination) Gusts19 kt Ceilingnone (clear) 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.

UA 1218 · SEA → DEN

Odds over time

How late will it get to DEN?