Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: United’s IAD → PWM flights land within a few points of 84% on time whatever the hour.

Nonstops


United	IAD	PWM	1h 46m	84%	1.9%	1,151	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Portland on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAD 08:29 → EWR 09:55UA 2396	2h 04m Newark	EWR 11:59 → PWM 13:25UA 3685 · flown by Republic	4h 56m	99%	89%
Delta Details →	IAD 06:00 → DTW 07:40DL 3826 · flown by SkyWest	2h 20m Detroit	DTW 10:00 → PWM 11:55DL 426	5h 55m	96%	87%
United Details →	IAD 06:10 → ORD 07:27UA 2070	3h 33m Chicago	ORD 11:00 → PWM 14:31UA 2804	8h 21m	100%	86%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	2h 34m Atlanta	ATL 10:20 → PWM 13:00DL 2479	7h 00m	97%	82%
Delta Details →	IAD 11:10 → DTW 12:44DL 2884	1h 16m Detroit	DTW 14:00 → PWM 15:55DL 1821	4h 45m	90%	78%
American Details →	IAD 09:20 → CLT 10:57AA 5219 · flown by PSA	3h 56m Charlotte	CLT 14:53 → PWM 17:09AA 2352	7h 49m	97%	75%
United Details →	IAD 06:30 → DEN 08:22UA 2031	1h 32m Denver	DEN 09:54 → PWM 15:49UA 1598	9h 19m	100%	75%
United Details →	IAD 12:35 → EWR 14:01UA 1498	2h 58m Newark	EWR 16:59 → PWM 18:29UA 3599 · flown by Republic	5h 54m	96%	67%
Tight connection: often missed
United Details →	IAD 15:39 → ORD 17:02UA 1393	1h 06m Chicago	ORD 18:08 → PWM 21:41UA 1401	6h 02m	68%	38%

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


United UA 4015 IAD 08:35 → PHL American AA 2354 PHL 12:45 → PWM Connection details →	3h 00m	5h 41m	100%	86%
United UA 6137 IAD 08:35 → DTW Delta DL 1821 DTW 14:00 → PWM Connection details →	3h 46m	7h 20m	96%	83%
United UA 1252 IAD 10:31 → ORD American AA 4774 ORD 15:20 → PWM Connection details →	3h 27m	8h 23m	100%	81%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

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