| Airline |
IATA code |
ICAO code |
Logo & link |
uep!fly (start 2021)  |
- |
- |
 |
Uganda Air Cargo (start 1994)  |
- |
UCC |
 |
| Uganda Airlines (start 2019) |
UR |
UGD |
 |
Ukraine Air Enterprise (start 1996)  |
- |
UKN |
 |
| Ukraine International Airlines (start 1992) |
PS |
AUI |
 |
| Ukrainian Mediterranean Airlines (stop 2018) |
UF |
UKM |
 |
Ulendo Airlink (start 2011)  |
W4 |
NYS |
 |
ULS Airlines Cargo (start 2004)  |
GO |
KZU |
 |
Ultimate Air Shuttle (start 2009)  |
UE |
UJC |
 |
Ultra Air (stop 2023)  |
OL |
ULS |
 |
Uni Air (start 1996)  |
B7 |
UIA |
 |
| United Airlines Limited (stop 2018) |
- |
- |
 |
| United Airlines (start 1931) |
UA |
UAL |
 |
United Airways (stop 2016)  |
4H |
UBD |
 |
United Nigeria Airlines (start 2020)  |
U5 |
UNA |
 |
| UPS Airlines (start 1988) |
5X |
UPS |
 |
UR Airlines (start 2019)  |
UD |
UBD |
 |
Ural Airlines (start 1993)  |
U6 |
SVR |
 |
Urumqi Air (start 2014)  |
UQ |
CUH |
 |
| US Airways (stop 2013)>>American Airlines |
US |
USA |
 |
| US-Bangla Airlines (start 2014) |
BS |
UBG |
 |
| USA Jet Airlines (start 1994) |
UJ |
JUS |
 |
| Utah Airways (start 2015) |
- |
- |
 |
| UTair (start 1991) |
UT |
UTA |
 |
| UVT Aero (start 2015) |
RT |
BUG |
 |
Uzbekistan Airways (start 1992)  |
HY |
UZB |
 |
| Uzbekistan Express (start 2021) |
HY |
UZB |
 |
