tailodds FORECAST
Tickets
Any day
Wednesday, October 7 · typical odds for a Wednesday (too early for a weather forecast) · issued Sat 12:00 PM ET · connections flying that day

Wed, Oct 7: Delta via Atlanta, leaving 12:07, is the safest bet: 83% chance of reaching San Juan on time.

Nonstops that day

All 1 nonstop →
UA 1339 United Flight history → DEN 09:43 SJU 17:38 15% 3% 0.6% 84%

Best connections that day, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Juan on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival (San Juan is 2 h ahead of Denver). Layovers up to 4 hours. Pick a connection for its 12-month details.
UnitedDetails → DEN 07:42 → IAH 11:15UA 1720 3h 48m Houston IAH 15:03 → SJU 20:38UA 701 10h 56m 100% 85%
DeltaDetails → DEN 10:52 → ATL 15:52DL 346 2h 53m Atlanta ATL 18:45 → SJU 22:30DL 1861 9h 38m 100% 85%
DeltaDetails → DEN 05:45 → ATL 10:44DL 341 2h 16m Atlanta ATL 13:00 → SJU 16:39DL 1946 8h 54m 99% 85%
UnitedDetails → DEN 05:00 → IAH 08:32UA 320 1h 31m Houston IAH 10:03 → SJU 15:42UA 1192 8h 42m 99% 82%
FrontierDetails → DEN 06:36 → MCO 12:22F9 4646 1h 59m Orlando MCO 14:21 → SJU 17:31F9 1824 8h 55m 99% 80%
UnitedDetails → DEN 00:09 → EWR 05:47UA 1745 2h 13m Newark EWR 08:00 → SJU 12:04UA 2143 9h 55m 99% 78%
FrontierDetails → DEN 11:22 → TPA 16:58F9 2748 3h 49m Tampa TPA 20:47 → SJU 00:03 +1F9 3980 10h 41m 98% 74%
DeltaDetails → DEN 12:10 → JFK 18:25DL 532 1h 04m New York JFK 19:29 → SJU 23:53DL 1859 9h 43m 85% 66%
How these are worked out. Each flight’s odds are our forecast for that day (typical odds until the weather forecast covers it); flights of airlines we don’t forecast yet use their 12-month record and are marked. Makes the connection: the first flight’s 12-month lateness curve, scaled so its chance of arriving 15+ min late matches the day’s forecast, at the layover minus the 45-minute minimum (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled × second flight within 15 minutes, each from the day’s forecast.

About this data: forecast odds from our model for Wed, Oct 7 (newest published update); 12-month records from US DOT on-time data, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. JSON