Route
BOS → STL
Boston Logan International Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 74.7%
- Less than 15 minutes late
- Cancelled
- 1.7%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,617
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 60%
- Airline (crew, maintenance, cleaning) 24%
- Air traffic control & airport 13%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 71.4% | 142 |
| October 2025 | 64.9% | 150 |
| November 2025 | 85.1% | 142 |
| December 2025 | 71.7% | 146 |
| January 2026 | 87.5% | 102 |
| February 2026 | 86.8% | 98 |
| March 2026 | 69.8% | 118 |
| April 2026 | 84.8% | 133 |
| May 2026 | 77.3% | 142 |
| June 2026 | 71.1% | 144 |
| July 2026 | 69.7% | 150 |
| August 2026 | 64.9% | 150 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 939 | 71.7% | 1.0% | 63 min |
| Envoy Air | 349 | 81.1% | 1.1% | 78 min |
| Republic Airways | 329 | 76.3% | 4.3% | 67 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
MQ3520
19% late · 116 flights
-
YX4678
47% late · 103 flights
-
YX4500
10% late · 102 flights
-
WN1438
14% late · 64 flights
-
WN752
0% late · 61 flights
-
WN4917
40% late · 60 flights
-
WN1441
22% late · 59 flights
-
WN702
9% late · 58 flights
-
WN908
43% late · 58 flights
-
WN900
5% late · 57 flights
-
MQ3814
11% late · 54 flights
-
WN754
62% late · 52 flights
-
MQ4224
19% late · 43 flights
-
YX4518
10% late · 43 flights
-
WN1399
38% late · 42 flights
-
WN901
11% late · 39 flights
-
MQ3381
6% late · 35 flights
-
WN1031
61% late · 33 flights
-
WN1268
6% late · 33 flights
-
WN1489
7% late · 31 flights
-
WN3775
40% late · 31 flights
-
WN882
77% late · 31 flights
-
YX4727
19% late · 28 flights
-
MQ3563
4% late · 27 flights
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