Showing United only (incl. its regional partners)All airlines ×

717 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: United’s STL → IAD flights land within a few points of 77% on time whatever the hour.

Best time to leave 8–9 am 82% arrive on time from STL

Best single flight UA 4506 STL 08:43 → IAD 11:55 · 82% on time Avoid UA 4454 STL 12:55 → IAD 16:07 · 72% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

STL

% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.


UA 4506flown by GoJet	STL 08:43	IAD 11:55	82%
UA 4454flown by GoJet	STL 12:55	IAD 16:07	72%

All 2 United flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.


UA 4506flown by GoJet	STL 08:43	IAD 11:55	2h 12m	352	82%	0.3%	83 min
UA 4454flown by GoJet	STL 12:55	IAD 16:07	2h 12m	364	72%	1.1%	171 min

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.


United	STL	IAD	2h 12m	77%	0.7%	717	Flying now

Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON