2004 in spaceflight
This article outlines notable events occurring in 2004 in spaceflight, including major launches and EVAs.
First privately funded human spaceflight
First Delta IV Heavy
Launches
January
February
March
April
May
June
July
August
September
October
November
December
Deep Space Rendezvous
EVAs
Orbital launch statistics
By country
For the purposes of this section, the yearly tally of orbital launches by country assigns each flight to the country of origin of the rocket, not to the launch services provider or the spaceport.By rocket
By family
By type
By configuration
By spaceport
By orbit
| Orbital regime | Launches | Failures | Accidentally achieved | Remarks | |
| Transatmospheric | 0 | 0 | 0 | 0 | |
| Low Earth | 23 | 22 | 1 | 0 | 6 to ISS |
| Medium Earth / Molniya | 5 | 5 | 0 | 2 | |
| Geosynchronous / GTO | 23 | 21 | 2 | 0 | |
| High Earth / Lunar transfer | 1 | 1 | 0 | 0 | |
| Heliocentric / Planetary transfer | 2 | 2 | 0 | 0 | |
| Total | 54 | 51 | 3 | 2 |