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 70-minute layover misses 7% of the time at 8 am and 31% of the time at 7 pm.

Nonstops


United	IAD	SEA	5h 51m	81%	0.6%	655	Flying now
Delta	IAD	SEA	5h 57m	78%	1.4%	361	Flying now
Alaska	IAD	SEA	5h 46m	76%	1.2%	835	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Seattle on time. Total trip = scheduled departure to arrival, layover included (Seattle is 3 h behind Dulles). Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAD 07:00 → LAX 09:26UA 325	2h 17m Los Angeles	LAX 11:43 → SEA 14:36UA 325	10h 36m	99%	88%
United Details →	IAD 06:30 → DEN 08:22UA 2031	3h 00m Denver	DEN 11:22 → SEA 13:22UA 1424	9h 52m	100%	86%
United Details →	IAD 08:15 → ORD 09:36UA 1775	3h 54m Chicago	ORD 13:30 → SEA 16:09UA 1660	10h 54m	100%	85%
United Details →	IAD 13:10 → LAX 15:42UA 1689	3h 25m Los Angeles	LAX 19:07 → SEA 22:00UA 684	11h 50m	99%	83%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	3h 24m Atlanta	ATL 11:10 → SEA 13:38DL 648	10h 38m	98%	83%
Delta Details →	IAD 07:15 → SLC 09:52DL 432	1h 43m Salt Lake City	SLC 11:35 → SEA 12:52DL 2995	8h 37m	94%	82%
Delta Details →	IAD 06:00 → MSP 07:55DL 3996 · flown by SkyWest	3h 15m Minneapolis	MSP 11:10 → SEA 12:58DL 889	9h 58m	97%	82%
United Details →	IAD 08:15 → DEN 10:10UA 792	3h 50m Denver	DEN 14:00 → SEA 16:00UA 2164	10h 45m	97%	81%
Tight connection: often missed
United Details →	IAD 14:51 → SFO 17:38UA 2862	50m San Francisco	SFO 18:28 → SEA 20:53UA 1577	9h 02m	74%	51%
United Details →	IAD 17:42 → EWR 19:10UA 1831	1h 20m Newark	EWR 20:30 → SEA 23:44UA 1796	9h 02m	71%	38%
American Details →	IAD 19:31 → DFW 21:50AA 1904	51m Dallas-Fort Worth	DFW 22:41 → SEA 00:57 +1AA 1487	8h 26m	46%	20%

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

MSP · 1h 10m · leaves 06:00 7%

EWR · 1h 10m · leaves 08:29 8%

SFO · 1h 03m · leaves 06:30 11%

Afternoon and evening

EWR · 1h 20m · leaves 17:42 29%

ORD · 1h 15m · leaves 17:42 31%

DFW · 51m · leaves 19:31 54%

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.


United UA 2073 IAD 17:43 → ANC Alaska AS 221 ANC 00:29 → SEA Connection details →	3h 08m	14h 17m	97%	94%
United UA 684 IAD 15:15 → LAX Alaska AS 495 LAX 21:12 → SEA Connection details →	3h 25m	11h 44m	99%	91%
United UA 325 IAD 07:00 → LAX Delta DL 1045 LAX 11:59 → SEA Connection details →	2h 33m	10h 54m	99%	87%

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