Southwest Airlines 737-800

Narrow-body jet

Fleet as reported in the 2025 annual filing · Registry & ages refreshed Nov 1, 2026

Southwest Airlines's busiest 737-800 routes, by departures — line weight is departures flown, dots are the airports it connects. Great-circle paths from US DOT T-100, trailing 12 months through July 2026.

Passengers flown a year: 43M; 3rd-largest Southwest Airlines sub-fleet
Airframes in the filing: 198
Airports served: 101
Countries: 6
Departures a day: 907
Average age: 11.1 yr

How Southwest Airlines flies its 737-800

Filed traffic data

The count above is the 737-800 airframes Southwest Airlines owns (US DOT Form 41). This is how it actually flew them to 101 airports across 6 countries — the capacity and busiest routes filed with US DOT T-100 over the trailing 12 months.

Departures flown

330,929

July 2026

Seats flown

57,912,575

Passengers

43M

Load factor

77.1%

RPM ÷ ASM

Block hours

756,543

Southwest Airlines's busiest 737-800 routes

Its busiest 737-800 routes over the trailing 12 months, by departures.

Denver – Phoenix (DEN–PHX)
2,077 departures · 271,585 passengers · 602 mi
74.7%
Load
Baltimore – Orlando (BWI–MCO)
2,053 departures · 263,878 passengers · 787 mi
73.5%
Load
Dallas – Phoenix (DAL–PHX)
1,919 departures · 240,470 passengers · 879 mi
71.6%
Load
Dallas – Denver (DAL–DEN)
1,884 departures · 239,336 passengers · 651 mi
72.6%
Load
Dallas – Las Vegas (DAL–LAS)
1,830 departures · 252,663 passengers · 1,067 mi
78.9%
Load
Denver – Las Vegas (DEN–LAS)
1,774 departures · 232,809 passengers · 628 mi
75.0%
Load
Chicago – Phoenix (MDW–PHX)
1,731 departures · 256,835 passengers · 1,444 mi
84.8%
Load
Las Vegas – Phoenix (LAS–PHX)
1,633 departures · 185,952 passengers · 255 mi
65.1%
Load
Orlando – Chicago (MCO–MDW)
1,628 departures · 233,037 passengers · 990 mi
81.8%
Load
Orlando – San Juan (MCO–SJU)
1,628 departures · 260,098 passengers · 1,188 mi
91.3%
Load
Nashville – Orlando (BNA–MCO)
1,605 departures · 212,440 passengers · 616 mi
75.6%
Load
Denver – Houston (DEN–HOU)
1,505 departures · 195,793 passengers · 883 mi
74.3%
Load
Las Vegas – San Diego (LAS–SAN)
1,502 departures · 188,704 passengers · 258 mi
71.8%
Load
Las Vegas – Chicago (LAS–MDW)
1,494 departures · 229,947 passengers · 1,521 mi
87.9%
Load
Las Vegas – Sacramento (LAS–SMF)
1,454 departures · 195,157 passengers · 397 mi
76.7%
Load

All Southwest Airlines 737-800 destinations →

The longest and shortest Southwest Airlines 737-800 flights

The two ends of the type's working envelope, from the routes it actually flew — not what the airframe is certified to do.

Longest route flown

2,457 mi

Baltimore – San Francisco (BWI–SFO)

5h 18m block · 352 departures · 83% load

Flown by Southwest Airlines. A long leg for a narrow-body twin — far enough from a diversion airport that the type carries an ETOPS rating.

Shortest route flown

73 mi

Colorado Springs – Denver (COS–DEN)

44m block · 402 departures · 70% load

Flown by Southwest Airlines. About 44m of block time, most of it connecting traffic feeding the hub.

Source: US DOT Bureau of Transportation Statistics, T-100 Segment. Data through July 2026.

Where Southwest Airlines flies the 737-800 from

Southwest Airlines flies its 737-800 from 101 US airports in 6 countries. The busiest, by departures:

DEN
Denver
24,670 departures · 77 routes
7.7%
Share
LAS
Las Vegas
20,295 departures · 59 routes
6.3%
Share
BWI
Baltimore
19,062 departures · 65 routes
6.0%
Share
MDW
Chicago
18,532 departures · 68 routes
5.8%
Share
DAL
Dallas
16,598 departures · 58 routes
5.2%
Share
PHX
Phoenix
16,345 departures · 47 routes
5.1%
Share
BNA
Nashville
15,728 departures · 64 routes
4.9%
Share
MCO
Orlando
15,042 departures · 51 routes
4.7%
Share
HOU
Houston
11,998 departures · 46 routes
3.8%
Share
STL
St Louis
10,335 departures · 44 routes
3.2%
Share

Browse all airports →

Where the 737-800 sits in Southwest Airlines's fleet

The 737-800 is 23.9% of Southwest Airlines's 858 tracked mainline aircraft.

Boeing 737-700 40.9%

Boeing 737-800 23.9%

Share of Southwest Airlines's mainline fleet · each type a slice

Other Southwest Airlines types

How old is the Southwest Airlines 737-800 fleet?

Southwest Airlines 737-800 — airframes by age (years)

0–4

5–9

10–14

15–19

20–24

25–29

30+

Age is measured from each airframe's delivery date — the FAA airworthiness date where available, otherwise the manufacturer's. Bars share a fixed scale across every fleet page, so two carriers can be compared directly.

Oldest airframeN8301JBoeing 737-80014.7 yr · Delivered Mar 7, 2012

Newest airframeN8583ZBoeing 737-8008.1 yr · Delivered Sep 30, 2018

See all 198 737-800 tail numbers in Southwest Airlines's fleet →

Monthly Southwest Airlines 737-800 capacity

28.4K

27.2K

29.6K

27.1K

28K

25.3K

24.2K

28.5K

27.5K

28K

28.1K

29K

AugSepOctNovDecJanFebMarAprMayJunJul

Monthly Southwest Airlines 737-800 departures across US routes, trailing 12 months through July 2026. Peak month in solid ink.

Frequently asked

How many 737-800 does Southwest Airlines have?

Southwest Airlines operates about 198 737-800 aircraft — 198 in service and 0 stored in its latest US DOT fleet filing.

Where does Southwest Airlines fly the 737-800?

Southwest Airlines flies its 737-800 to about 101 US airports across 6 countries, its busiest route being DEN–PHX.

How old are Southwest Airlines's 737-800?

Southwest Airlines's 737-800 fleet averages about 11.1 yr, ranging from 8.1 yr to 14.7 yr.

What is the longest 737-800 route Southwest Airlines flies?

The longest 737-800 route Southwest Airlines flew over the trailing 12 months is BWI–SFO, about 2,457 miles.