Illustrative image; it may differ from the actual aircraft.

Boeing 737-800 (737-8H4)

B737-36723Active

RegistrationUSN8685B

Verified aircraft dataagainst the official civil aviation register

OperatorSouthwest Airlines

1operators

0incidents

1accidents

10logbook years

0photos

Boeing 737-800 (737-8H4) built in 2016 in Renton. Operates for Southwest Airlines.

NewNearly newYoungMatureAgingOld

Nearly new · 10 years · ≈ 33,000 flight hours (approx.)

Vuelopedia is a work in progress: it currently holds about 30% of the information we expect to have by the third quarter of 2027. Although we use only official, highly reliable sources, some aircraft data and history may still contain errors or inaccuracies. We work hard to clear every anomaly from the records using specialized verification tools.

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Technical data

ManufacturerBoeing

Engines2× 2 x CFMI CFM56-7B27E

PropulsionTurbofan

Seats175 (Y175)

First flight2016

Built inRenton, Washington (EE. UU.)

Country of registrationEstados Unidos

OwnerSouthwest Airlines

MSN36723

Hex / ICAO 24-bitABEF98

VerificationIdentity verified against the official register of FAA (United States) · Oct 8, 2026

The model · Boeing 737

Figures for the 737-800 variant, the most representative of the family

Length39.5 m129 ft

Wingspan35.8 m117 ft

Height12.6 m41 ft

Range5,436 km2,935 NMWith a typical passenger load

Cruise speed834 km/h450 ktMach 0.79

Service ceiling12,500 m41,011 ftIt flies above Everest (1.4 times its height)

Maximum take-off weight79,016 kg174,200 lb

Maximum payload37,603 kg82,900 lbIts 162 passengers with baggage would weigh about 16.2 t; the rest is fuel and cargo

Typical capacity162 passengersUp to 189 in a high-density layout

Endurance6 h 31 minAt cruise speed, non-stop

With its 5,436 km range, from Chicago it could fly non-stop as far as:

BOGBogota4,339 km PTYTocumen3,729 km LAXLos Angeles2,812 km SEASeattle2,782 km MEXMexico City2,705 km

Beyond its rangeLIMLima6,082 km

The type first flew in 1967 (59 years ago) · About 10,200 units built · Production ended in 2019

Figures for the type, not for this particular aircraft: each variant and each configuration changes something. They are shown in both systems used in aviation.

The full story of the Boeing 737 Compare this aircraft

Seating layout

175Economy

175 seats in total

Airports

Where this aircraft has operated, by period · source BTS (EE. UU.)

Flight logbook

Year-by-year activity · source BTS (EE. UU.)

2025

Southwest Airlines · 1,542 flights during the year · base Chicago (MDW)

Main route of the year: Dallas (DAL) → Nashville (BNA)

41 days inactive

2024

Southwest Airlines · 1,741 flights during the year · base Denver (DEN)

Main route of the year: San Juan (SJU) → Orlando (MCO)

2023

Southwest Airlines · 1,861 flights during the year · base Baltimore (BWI)

Main route of the year: Chicago (MDW) → Atlanta (ATL)

2022

Southwest Airlines · 1,860 flights during the year · base Chicago (MDW)

Main route of the year: Orlando (MCO) → San Juan (SJU)

2021

Southwest Airlines · 1,647 flights during the year · base Denver (DEN)

Main route of the year: Phoenix (PHX) → Denver (DEN)

2020

Southwest Airlines · 1,405 flights during the year · base Denver (DEN)

Main route of the year: Phoenix (PHX) → Chicago (MDW)

2019

Southwest Airlines · 1,609 flights during the year · base Denver (DEN)

Main route of the year: Phoenix (PHX) → Chicago (MDW)

2018

Southwest Airlines · 1,568 flights during the year · base Chicago (MDW)

Main route of the year: Chicago (MDW) → Las Vegas (LAS)

Aircraft chronology

2016

Built

Assembled by Boeing in Renton, Washington (USA).

May 5, 2016

Delivered to Southwest Airlines

Delivered to Southwest Airlines as N8685B.

Jun 18, 2025

Accident at Barlow Bend, Alabama

On June 18, 2025, the Boeing 737-8H4 aircraft (registration N8685B), operated by Southwest Airlines, was involved in an accident at Barlow Bend, Alabama (United States), leaving 11 injured. Source: the NTSB (United States).

What happened

On 18 June 2025, descending into Northwest Florida Beaches airport, Panama City, Florida, Southwest Airlines flight 311 — arriving from Dallas Love Field — met severe, unexpected turbulence while passing through a thin cloud layer. The captain had already asked the flight attendants to secure the cabin and sit down early, having sighted scattered cumulus at around FL200. Descending through FL290, in a hazy layer, the aircraft met 10 to 15 seconds of turbulence: the autopilot disconnected, the airspeed fluctuated and the aircraft shook. The crew levelled at FL270 and then learned that several occupants had been injured. On arrival, the medical services took three flight attendants and four passengers to hospital; one flight attendant suffered a fracture of the right ankle and was operated on, and ten other minor injuries were recorded. The aircraft was undamaged. Source: the NTSB (United States).

Source: NTSB

Operators

2016-05-05

Southwest Airlines

Registration N8685B

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This page was last updated on October 10, 2026

APA

Vuelopedia. (2026, October 10). Boeing 737-800 (737-8H4) · N8685B · Southwest Airlines. Retrieved October 22, 2026, from https://vuelopedia.org/en/aircraft/B737-36723

MLA

“Boeing 737-800 (737-8H4) · N8685B · Southwest Airlines.” Vuelopedia, Fundación Poderia, 10 Oct. 2026, vuelopedia.org/en/aircraft/B737-36723. Accessed 22 Oct. 2026.

Chicago

Vuelopedia. “Boeing 737-800 (737-8H4) · N8685B · Southwest Airlines.” Fundación Poderia. Last modified October 10, 2026. https://vuelopedia.org/en/aircraft/B737-36723.

Harvard

Vuelopedia (2026) Boeing 737-800 (737-8H4) · N8685B · Southwest Airlines. Available at: https://vuelopedia.org/en/aircraft/B737-36723 (Accessed: 22 October 2026).

BibTeX

@misc{vuelopedia_en_aircraft_b737_36723,
  author       = {{Vuelopedia}},
  title        = {{Boeing 737-800 (737-8H4) · N8685B · Southwest Airlines}},
  publisher    = {Fundación Poderia},
  year         = {2026},
  date         = {2026-10-10},
  url          = {https://vuelopedia.org/en/aircraft/B737-36723},
  howpublished = {\url{https://vuelopedia.org/en/aircraft/B737-36723}},
  urldate      = {2026-10-22},
  note         = {Accessed 2026-10-22}
}

Wikipedia

{{cite web |url=https://vuelopedia.org/en/aircraft/B737-36723 |title=Boeing 737-800 (737-8H4) · N8685B · Southwest Airlines |website=Vuelopedia |publisher=Fundación Poderia |date=2026-10-10 |access-date=2026-10-22 |language=en}}