United Airlines 737-800
UANarrow-body jet
Fleet as reported in the 2025 annual filing · Registry & ages refreshed Sep 1, 2026
- Passengers flown a year
- 21M
- 1st-largest United Airlines sub-fleet
- Airframes in the filing
- 141
- Airports served
- 130
- Countries
- 21
- Departures a day
- 434
- Average age
- 22.5 yr
How United Airlines flies its 737-800
Filed traffic dataThe count above is the 737-800 airframes United Airlines owns (US DOT Form 41). This is how it actually flew them to 130 airports across 21 countries — the capacity and busiest routes filed with US DOT T-100 over the trailing 12 months.
Departures flown
158,476
May 2026
Seats flown
26,307,016
Passengers
21M
Load factor
81.0%
RPM ÷ ASM
Block hours
420,060
United Airlines's busiest 737-800 routes
Its busiest 737-800 routes over the trailing 12 months, by departures.
7,265 departures · 1,021,162 passengers · 733 mi
84.7%
Load
3,295 departures · 458,145 passengers · 1,416 mi
83.8%
Load
San Diego – San Francisco (SAN–SFO)
2,406 departures · 339,451 passengers · 447 mi
85.0%
Load
Hagåtña – Narita (GUM–NRT)
1,909 departures · 254,657 passengers · 1,559 mi
80.4%
Load
Las Vegas – San Francisco (LAS–SFO)
1,904 departures · 240,767 passengers · 414 mi
76.2%
Load
Los Angeles – San Francisco (LAX–SFO)
1,729 departures · 247,784 passengers · 337 mi
86.3%
Load
Phoenix – San Francisco (PHX–SFO)
1,493 departures · 202,116 passengers · 651 mi
81.5%
Load
1,459 departures · 209,720 passengers · 804 mi
86.6%
Load
Denver – Kansas City (DEN–MCI)
1,399 departures · 194,868 passengers · 533 mi
83.9%
Load
1,367 departures · 201,406 passengers · 867 mi
88.8%
Load
Washington – Chicago (DCA–ORD)
1,293 departures · 147,211 passengers · 612 mi
68.6%
Load
1,277 departures · 172,758 passengers · 602 mi
81.5%
Load
1,271 departures · 187,171 passengers · 1,671 mi
88.7%
Load
1,224 departures · 162,269 passengers · 628 mi
79.9%
Load
Chicago – Philadelphia (ORD–PHL)
1,205 departures · 166,127 passengers · 678 mi
83.0%
Load
The longest and shortest United 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
2,329 mi
Baltimore – Los Angeles (BWI–LAX)
5h 15m block · 227 departures · 81% load
Flown by United 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)
50m block · 256 departures · 77% load
Flown by United Airlines. About 50m of block time, most of it connecting traffic feeding the hub.
Source: US DOT Bureau of Transportation Statistics, T-100 Segment. Data through May 2026.
Where United Airlines flies the 737-800 from
United Airlines flies its 737-800 from 130 US airports in 21 countries. The busiest, by departures:
- DEN
27,969 departures · 87 routes
18.4%
Share
- ORD
17,097 departures · 62 routes
11.2%
Share
- IAH
13,503 departures · 58 routes
8.9%
Share
- SFO
10,159 departures · 33 routes
6.7%
Share
- LGA
5,360 departures · 3 routes
3.5%
Share
- GUM
Hagåtña
3,061 departures · 10 routes
2.0%
Share
- IAD
2,845 departures · 21 routes
1.9%
Share
- LAX
2,558 departures · 14 routes
1.7%
Share
- LAS
2,498 departures · 6 routes
1.6%
Share
- CLE
2,079 departures · 10 routes
1.4%
Share
Where the 737-800 sits in United Airlines's fleet
The 737-800 is 13.1% of United Airlines's 1,076 tracked mainline aircraft.
Share of United Airlines's mainline fleet · each type a slice
Other United Airlines types
How old is the United Airlines 737-800 fleet?
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.
See all 141 737-800 tail numbers in United Airlines's fleet →
Monthly United Airlines 737-800 capacity
Frequently asked
How many 737-800 does United Airlines have?
United Airlines operates about 141 737-800 aircraft — 141 in service and 0 stored in its latest US DOT fleet filing.
Where does United Airlines fly the 737-800?
United Airlines flies its 737-800 to about 130 US airports across 21 countries, its busiest route being LGA–ORD.
How old are United Airlines's 737-800?
United Airlines's 737-800 fleet averages about 22.5 yr, ranging from 9.0 yr to 28.2 yr.
What is the longest 737-800 route United Airlines flies?
The longest 737-800 route United Airlines flew over the trailing 12 months is BWI–LAX, about 2,329 miles.