Flight Check

STL Airport Complaints — Which Airlines Have the Most Issues

Complaint rates for 7 airlines operating at St. Louis Lambert International in St. Louis.

Weighted Avg Rate

3.3/100K

Airlines Tracked

7

Top Issue

Baggage

vs. Industry

60% below

Airline Complaint Rates at STL

Ranked by DOT complaint rate per 100,000 passengers. Rates reflect each airline's nationwide complaint data, contextualized by their presence at St. Louis Lambert International.

1Frontier Airlines(F9)
23.2/100K
5,879 total complaintsTop issue: Refunds
2Spirit Airlines(NK)
12.9/100K
4,480 total complaintsTop issue: Flight Problems
3American Airlines(AA)
7.9/100K
12,808 total complaintsTop issue: Baggage
4United Airlines(UA)
6.9/100K
11,156 total complaintsTop issue: Flight Problems
5Delta Air Lines(DL)
4.1/100K
7,139 total complaintsTop issue: Flight Problems
6Alaska Airlines(AS)
2.5/100K
1,828 total complaintsTop issue: Customer Service
7Southwest Airlines(WN)
1.5/100K
3,165 total complaintsTop issue: Baggage

Source: DOT Air Travel Consumer Report, 2024. Rates are nationwide per-airline figures.

Monthly Complaint Trend at STL (2024)

3.3
Jan
3.0
Feb
3.0
Mar
3.0
Apr
3.0
May
3.6
Jun
3.7
Jul
3.4
Aug
3.0
Sep
3.0
Oct
3.0
Nov
3.6
Dec

Weighted average complaint rate per 100K passengers by month. Red bars exceed the industry average (8.2).

Top Complaint Categories at STL

Baggage70%
Flight Problems27%
Customer Service2%
Refunds2%

Weighted by airline flight volume at STL. Categories reflect the most frequently reported issue type for each airline.

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Frequently Asked Questions

Which airline gets the most complaints at STL?

Frontier Airlines has the highest complaint rate among airlines operating at St. Louis Lambert International at 23.2 per 100,000 passengers. However, complaint rates reflect the airline's nationwide performance, not issues specific to STL.

What is the overall complaint environment at STL?

The weighted average complaint rate for airlines at St. Louis Lambert International is 3.3 per 100K passengers, which is 60% below the industry average of 8.2 per 100K. The most common complaint category is baggage.

How do I file a complaint about an experience at STL?

If your complaint is about an airline, file with the DOT at airconsumer.dot.gov or use Flight Check's Disruption Desk (flightcheck.live/disruption-desk) to generate a complaint letter and check what you're owed. For airport facility issues (parking, terminals, security lines), contact the airport authority directly.

Does STL cause more airline complaints than other airports?

Airport-level complaint data from the DOT is reported by airline, not by airport. The data shown here reflects the complaint rates of airlines that operate at STL, weighted by their flight volume. Airports with more low-cost carriers tend to have higher aggregate complaint rates.

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Source: DOT Air Travel Consumer Report, January–December 2024. Complaint rates are per-airline nationwide figures weighted by flight volume at STL.