Home / Routes / KSTL → KSEA1,099 scheduled

The route from St Louis Lambert International Airport (KSTL) in St Louis to Seattle Tacoma International Airport (KSEA) in Seattle. SkyMeter tracks roughly 1,099 scheduled flights on this route across 5 carriers. The most active operator is ASA (ASA). Average block time is 3h 59m. Departures average 25 minutes off schedule, with 46% running more than 15 minutes late. The most common aircraft on this route is the BOEING Boeing 737 MAX 9.

Scheduled
1,099
last 487 days
ADS-B observed
173
Airlines
5
Avg dep delay
25m
Late >15 min
46.0%
Cancel rate
0.27%

Recent observed flights

From ADS-B trace data

2026-09-05 20:54  →  2026-09-06 01:19  ·  4h 25m
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2026-09-05 11:41  →  2026-09-05 15:35  ·  3h 53m
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2026-09-04 11:42  →  2026-09-04 15:25  ·  3h 42m
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2026-09-01 11:35  →  2026-09-01 15:23  ·  3h 47m
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2026-09-01 01:08  →  2026-09-01 05:18  ·  4h 9m
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2026-08-31 11:36  →  2026-08-31 15:37  ·  4h 0m
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2026-08-30 20:18  →  2026-08-31 00:22  ·  4h 4m
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2026-08-29 20:43  →  2026-08-30 00:50  ·  4h 6m
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2026-08-29 11:47  →  2026-08-29 15:38  ·  3h 51m
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2026-08-28 20:18  →  2026-08-29 00:18  ·  3h 59m
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Codeshare partnerships

Marketing carriers selling tickets on this route under their own flight numbers

sells ASA 768
sells ASA 762
sells ASA 669
sells ASA 316
sells ASA 299
sells ASA 67

Looking for the return flight?

View KSEA → KSTL