tailodds FORECAST
Tickets
Any day
Monday, October 5 · our forecast odds · issued Sun 8:00 PM ET · connections flying that day

Tomorrow: Delta via Atlanta, leaving 12:07, is the safest bet: 75% chance of reaching San Juan on time; the tightest one-ticket connections make it only 60% of the time.

Nonstops that day

All 1 nonstop →
UA 1339 United Flight history → DEN 09:43 SJU 17:38 13% 4% 0.7% 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 07:48 → ORD 11:29UA 1928 3h 09m Chicago ORD 14:38 → SJU 20:34UA 695 10h 46m 100% 84%
UnitedDetails → DEN 16:20 → IAH 19:57UA 588 3h 59m Houston IAH 23:56 → SJU 05:29 +1UA 1497 11h 09m 99% 83%
UnitedDetails → DEN 07:42 → IAH 11:15UA 1720 3h 48m Houston IAH 15:03 → SJU 20:38UA 701 10h 56m 100% 81%
DeltaDetails → DEN 00:59 → DTW 05:48DL 1096 2h 47m Detroit DTW 08:35 → SJU 13:11DL 1913 10h 12m 97% 80%
DeltaDetails → DEN 00:40 → ATL 05:42DL 302 2h 31m Atlanta ATL 08:13 → SJU 11:55DL 1930 9h 15m 99% 80%
UnitedDetails → DEN 08:00 → IAD 13:26UA 1101 3h 58m Dulles IAD 17:24 → SJU 21:24UA 2025 11h 24m 100% 78%
DeltaDetails → DEN 05:45 → ATL 10:44DL 341 2h 16m Atlanta ATL 13:00 → SJU 16:39DL 1946 8h 54m 97% 77%
DeltaDetails → DEN 10:52 → ATL 15:52DL 346 2h 53m Atlanta ATL 18:45 → SJU 22:29DL 1861 9h 37m 100% 76%
Tight connection: often missed
UnitedDetails → DEN 19:35 → IAH 23:06UA 475 50m Houston IAH 23:56 → SJU 05:29 +1UA 1497 7h 54m 61% 51%
AmericanDetails → DEN 12:11 → MIA 18:19AA 3118 57m Miami MIA 19:16 → SJU 21:59AA 1364 7h 48m 60% 45%
UnitedDetails → DEN 12:40 → EWR 18:35UA 1283 1h 10m Newark EWR 19:45 → SJU 23:50UA 1543 9h 10m 68% 41%
How these are worked out. Each flight’s odds are our forecast for that day; 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 Mon, Oct 5 (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