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.
ALLEGIANT · FLIGHT G4 1637
SCHEDULED · TYPICAL SCHEDULE
Monday, October 5 Tomorrow
G4 1637 · SNA → MFR
departs 6:27 PM PT · arrives 8:21 PM PT
Forecast issued Sun 12:00 PM ET · 34h before departure
Watch this flight
Other days
Mon 10/5
Fri 10/9 48%
Odds over time
Arrive at MFR more than 15 minutes late?
37%
chance · ±2 pts
−1 pt · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
Arrive 15+ late
37%
Leave 15+ late
31%
Arrive 1h+ late
9%
Cancelled
1%
MOSTLY HISTORY
WEATHER FORECASTS
LIVE
IN THE AIR
0%
15%
30%
45%
60%
6.9d
2d
Now
1d
12h
6h
Departs
Lands
Arrive at MFR more than 15 minutes late?
Calm-weather odds: 33% · changed −1 pt in 24h
−1 pt
37%
Yes 37%
No 63%
Leave SNA more than 15 minutes late?
Calm-weather odds: 25% · changed +2 pts in 24h
+2 pts
31%
Yes 31%
No 69%
Arrive at MFR more than an hour late?
Calm-weather odds: 7% · changed +0 pts in 24h
+0 pts
9%
Yes 9%
No 91%
Cancelled?
Calm-weather odds: <1% · changed +0 pts in 24h
+0 pts
1%
Yes 1%
No 99%
How late will it get to MFR?
On time or early
63%
15–30 min late
14%
30 min–1 hour late
13%
1–2 hours late
5%
Over 2 hours late
4%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.
What’s moving the odds
↑
G4's recent on-time record
↑
This flight has been late 24% of the time recently
↑
6pm departures from SNA are often late
↓
Mondays in October are usually quieter than average
↓
Mostly benign weather forecast at MFR
Weather at each end
SNA (origin)
Gusts 17 kt Ceiling none (clear) Visibility 10+ mi Precip none
MFR (destination)
Gusts 5 kt Ceiling none (clear) Visibility 8 mi Precip none
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.