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

Connect in the morning. The same one-hour layover misses 4% of the time at 8 am and almost half the time at 9 pm.

Nonstops


United	BOS	IAD	1h 43m	84%	2.7%	1,516	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 →	BOS 06:00 → ORD 07:58UA 1414	3h 09m Chicago	ORD 11:07 → IAD 14:12UA 1869	8h 12m	100%	87%
Delta Details →	BOS 05:30 → ATL 08:15DL 2242	1h 35m Atlanta	ATL 09:50 → IAD 11:39DL 1444	6h 08m	100%	84%
Delta Details →	BOS 05:30 → DTW 07:39DL 1019	1h 11m Detroit	DTW 08:50 → IAD 10:23DL 2884	4h 55m	96%	84%
Delta Details →	BOS 06:06 → JFK 07:25DL 2611	2h 51m New York	JFK 10:16 → IAD 11:48DL 5835 · flown by Republic	5h 42m	99%	82%
Delta Details →	BOS 06:50 → ATL 09:33DL 695	2h 44m Atlanta	ATL 12:17 → IAD 14:02DL 2135	7h 12m	98%	81%
American Details →	BOS 06:05 → CLT 08:30AA 418	2h 35m Charlotte	CLT 11:05 → IAD 12:38AA 5220 · flown by PSA	6h 33m	99%	81%
Delta Details →	BOS 09:15 → DTW 11:25DL 1748	3h 45m Detroit	DTW 15:10 → IAD 16:42DL 1787	7h 27m	98%	80%
United Details →	BOS 08:15 → ORD 10:12UA 1834	3h 18m Chicago	ORD 13:30 → IAD 16:30UA 2794	8h 15m	100%	76%
Tight connection: often missed
United Details →	BOS 15:13 → ORD 17:05UA 1475	1h 07m Chicago	ORD 18:12 → IAD 21:22UA 2202	6h 09m	65%	36%
United Details →	BOS 18:43 → ORD 20:40UA 1015	1h 00m Chicago	ORD 21:40 → IAD 00:45 +1UA 2766	6h 02m	51%	34%
American Details →	BOS 14:27 → DFW 17:50AA 820	54m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	8h 25m	71%	31%

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 05:30 4%

ORD · 55m · leaves 08:15 8%

Afternoon and evening

DFW · 54m · leaves 14:27 29%

CLT · 1h 02m · leaves 16:47 32%

ORD · 1h 00m · leaves 18:43 49%

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.


Delta DL 1019 BOS 05:30 → DTW United UA 3500 DTW 10:13 → IAD Connection details →	2h 34m	6h 20m	98%	89%
Delta DL 5596 BOS 07:10 → SAV United UA 2057 SAV 12:05 → IAD Connection details →	2h 10m	6h 35m	97%	89%
American AA 4171 BOS 09:55 → ROC United UA 4521 ROC 15:00 → IAD Connection details →	3h 30m	6h 26m	99%	88%

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