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.

UNITED · FLIGHT UA 2121 SCHEDULED · TYPICAL SCHEDULE

Friday, October 2 Today

UA 2121 · DEN → GRR

departs 5:55 PM MT · arrives 10:35 PM ET

Forecast issued Fri 4:00 PM ET · 4h before departure

Arrive at GRR more than 15 minutes late?

37% chance · ±0 pts +12 pts · 24h

HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.

How late will it get to GRR?

On time or early
60%
15–30 min late
23%
30 min–1 hour late
4%
1–2 hours late
6%
Over 2 hours late
3%
Cancelled
4%

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

What’s moving the odds

↑ 5pm departures from DEN are often late

↑ Later flights pick up delays from earlier in the day

↑ This flight has been late 28% of the time recently

↓ UA's recent on-time record

↓ Gusts to 31 kt forecast at DEN that day

Weather at each end

DEN (origin) Gusts31 kt Ceilingnone (clear) Visibility10+ mi Precipnone

GRR (destination) Gusts18 kt Ceiling1,000 ft Visibility7 mi Precip0.23 in

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 2121 · DEN → GRR

Odds over time

How late will it get to GRR?