Route
STL → BOS
St. Louis Lambert International Airport Boston Logan International Airport
How punctual is this route?
- On-time arrivals
- 66.9%
- Less than 15 minutes late
- Cancelled
- 1.8%
- Of scheduled flights
- Average delay when late
- 72 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,616
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 51%
- Air traffic control & airport 27%
- Airline (crew, maintenance, cleaning) 17%
- Extreme weather 3%
- Security 2%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 70.2% | 142 |
| October 2025 | 53.7% | 150 |
| November 2025 | 76.1% | 140 |
| December 2025 | 80.0% | 146 |
| January 2026 | 81.2% | 102 |
| February 2026 | 83.5% | 98 |
| March 2026 | 62.1% | 118 |
| April 2026 | 67.9% | 134 |
| May 2026 | 64.1% | 142 |
| June 2026 | 62.9% | 144 |
| July 2026 | 57.7% | 150 |
| August 2026 | 54.1% | 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 | 938 | 62.8% | 0.7% | 62 min |
| Envoy Air | 349 | 73.6% | 2.3% | 84 min |
| Republic Airways | 329 | 71.7% | 4.3% | 95 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
YX4493
18% late · 102 flights
-
YX4678
43% late · 102 flights
-
MQ3416
23% late · 96 flights
-
WN3001
10% late · 64 flights
-
MQ3563
18% late · 62 flights
-
WN2114
35% late · 60 flights
-
WN3341
25% late · 60 flights
-
WN3892
68% late · 60 flights
-
WN4439
52% late · 58 flights
-
MQ3814
13% late · 54 flights
-
WN4998
26% late · 53 flights
-
WN3891
24% late · 52 flights
-
WN3948
20% late · 49 flights
-
MQ4224
33% late · 43 flights
-
YX4624
26% late · 43 flights
-
WN4438
41% late · 39 flights
-
WN4724
46% late · 35 flights
-
WN3731
64% late · 33 flights
-
WN2507
61% late · 31 flights
-
WN3168
26% late · 31 flights
-
WN3812
35% late · 31 flights
-
WN4420
29% late · 31 flights
-
WN4409
55% late · 30 flights
-
WN458
0% late · 30 flights
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