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Thanksgiving & Christmas Flight Delays at STL: St. Louis Lambert International Airport

Over the last four Thanksgiving travel weeks (2022–2025, Tuesday before through Sunday after), 22.2% of flights that left St. Louis Lambert International Airport (St. Louis, MO) arrived at least 15 minutes late and 0.7% were cancelled. In the rest of November the same airport had 14.3% late and 0.6% cancelled, so Thanksgiving week had 7.9 points more late arrivals. The best day was Thanksgiving Day (8.5% late); the worst was Sat after (48.1% late).

22.2%late arrivals, Thanksgiving week

0.7%cancelled, Thanksgiving week

28.6%late arrivals, Dec 20–31

6.5%cancelled, Dec 20–31

Which day of Thanksgiving week is best at STL?

Day	Flights (4 yrs)	Late (15+ min)	Cancelled	Avg dep. delay (min)
Tue before	741	16.0%	0.1%	11.2
Wed before	748	13.9%	0.0%	7.4
Thanksgiving Day	433	8.5%	0.0%	9.2
Fri after	662	9.1%	0.2%	8.3
Sat after	691	48.1%	3.0%	34.9
Sun after	782	32.3%	0.6%	22.0

Pooled over 2022–2025. Thanksgiving 2026 is Thursday, Nov 26, so the window is Tue Nov 24 – Sun Nov 29. Individual days have fewer flights, so small differences are noise.

Year by year at STL

Year	Thanksgiving week late	Thanksgiving week cancelled	Rest of Nov. late	Dec 20–31 late	Dec 20–31 cancelled
2022	16.5%	0.3%	18.1%	42.9%	26.3%
2023	18.6%	0.2%	11.3%	27.1%	0.6%
2024	19.7%	0.0%	11.9%	24.9%	0.7%
2025	33.2%	2.2%	16.5%	24.4%	0.8%

Single years can be dominated by one storm or airline meltdown; look at the range, not just the average. Dec 20–31, 2022 includes the late-December 2022 winter storm and airline disruptions nationwide.

Christmas week (Dec 20–31) at STL

Across 2022–2025, 28.6% of flights from STL arrived 15+ minutes late and 6.5% were cancelled during Dec 20–31, compared with 18.0% late and 0.5% cancelled from Dec 1–19 (+10.6 pts late arrivals).

Airlines at STL, Thanksgiving week

Airline (flights it operated)	Flights (4 yrs)	Late	Cancelled	Dec 20–31 late
Southwest	2,601	22.2%	0.5%	31.1%
American Airlines	385	20.9%	0.8%	23.5%
Delta Air Lines	348	14.7%	0.0%	16.6%

* Regional airline that mostly flies under another airline’s brand (for example American Eagle, Delta Connection, United Express), so the ticket you bought may not match the operator. Airlines with fewer than 200 flights in the window are omitted.

Why flights from STL were late (Thanksgiving week)

Cause category (BTS)	Share of delay minutes
Airline (crew, maintenance, cleaning…)	32.8%
Extreme weather	8.3%
National Aviation System (air traffic, volume)	19.8%
Security	0.1%
Late-arriving aircraft	38.9%

Share of reported delay minutes on flights that arrived 15+ minutes late. “Extreme weather” is only a narrow category; many weather-related delays are counted under National Aviation System or late-arriving aircraft. Categories are assigned by airlines to BTS rules.

Other airports nearby

MCI – Kansas City International Airport

Source: BTS Airline On-Time Performance data, flights departing STL operated by airlines that report to BTS. “Late” = arrived 15 or more minutes after schedule (the DOT definition), counted among flights that were not cancelled or diverted. Computed by Holiday Delay Odds; see methodology.