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 CMH → IAD flights land within a few points of 84% on time whatever the hour.

Nonstops


United	CMH	IAD	1h 24m	84%	1.4%	1,474	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	CMH 05:30 → ORD 06:09UA 3524 · flown by Republic	2h 31m Chicago	ORD 08:40 → IAD 11:52UA 2277	6h 22m	98%	89%
United Details →	CMH 07:00 → ORD 07:39UA 3429 · flown by Republic	3h 28m Chicago	ORD 11:07 → IAD 14:12UA 1869	7h 12m	98%	87%
Delta Details →	CMH 06:30 → DTW 07:39DL 5701 · flown by Republic	1h 11m Detroit	DTW 08:50 → IAD 10:23DL 2884	3h 55m	96%	85%
Delta Details →	CMH 07:05 → ATL 08:42DL 2909	3h 35m Atlanta	ATL 12:17 → IAD 14:02DL 2135	6h 57m	99%	83%
Delta Details →	CMH 10:31 → DTW 11:35DL 3739 · flown by SkyWest	3h 35m Detroit	DTW 15:10 → IAD 16:42DL 1787	6h 11m	98%	82%
Delta Details →	CMH 06:00 → ATL 07:36DL 2469	2h 14m Atlanta	ATL 09:50 → IAD 11:39DL 1444	5h 38m	97%	80%
American Details →	CMH 06:09 → CLT 07:39AA 3206	3h 26m Charlotte	CLT 11:05 → IAD 12:38AA 5220 · flown by PSA	6h 29m	99%	80%
Delta Details →	CMH 07:05 → JFK 09:03DL 5656 · flown by Republic	1h 13m New York	JFK 10:16 → IAD 11:48DL 5835 · flown by Republic	4h 43m	93%	77%
Tight connection: often missed
United Details →	CMH 11:43 → IAH 13:40UA 4065 · flown by Mesa	51m Houston	IAH 14:31 → IAD 18:50UA 1478	7h 07m	73%	55%
United Details →	CMH 14:19 → ORD 14:55UA 493	58m Chicago	ORD 15:53 → IAD 19:02UA 2437	4h 43m	70%	49%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

DTW · 1h 11m · leaves 06:30 4%

ATL · 1h 08m · leaves 07:05 5%

JFK · 1h 13m · leaves 07:05 7%

Afternoon and evening

ORD · 1h 11m · leaves 16:20 12%

CLT · 1h 19m · leaves 17:26 22%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

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.


American AA 4487 CMH 05:30 → ORD United UA 2277 ORD 08:40 → IAD Connection details →	2h 40m	6h 22m	100%	92%
Southwest WN 1193 CMH 05:10 → MCO United UA 1893 MCO 09:37 → IAD Connection details →	2h 17m	6h 45m	100%	91%
Delta DL 5701 CMH 06:30 → DTW United UA 3500 DTW 10:13 → IAD Connection details →	2h 34m	5h 20m	98%	90%

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