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NASA astronauts travel to the International Space Station aboard SpaceX’s Crew Dragon, launched on a Falcon 9 rocket. Dragon then maneuvers to the station and docks with its Harmony module. After the incoming crew completes a handover with the astronauts already aboard, the departing crew returns in its own Dragon, which reenters Earth’s atmosphere, splashes down in the sea and is recovered by a ship and support teams.
What NASA and SpaceX each do
The trip is a partnership, not a single vehicle operated by one organization. NASA sets mission requirements, provides the astronauts, oversees the flight and coordinates station and mission operations. SpaceX supplies and operates the transportation system: the Falcon 9 launch vehicle and the Crew Dragon spacecraft. NASA’s Commercial Crew Program uses commercial transportation systems to support station crew rotations and the station’s obligation to have a way for its crew to return in an emergency.
That division of work matters because the rocket and the spacecraft have different jobs. Falcon 9 provides the thrust to lift Dragon from Florida and put it on a path into orbit. Dragon is the crew vehicle: it carries the astronauts, navigates to the ISS, docks, and later brings its crew back to Earth. The rocket does not travel with the astronauts to the station.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →| Part of the trip | System or organization | Role |
|---|---|---|
| Launch from Florida | Falcon 9, operated by SpaceX | Boosts Crew Dragon toward orbit. |
| Travel to and from the ISS | Crew Dragon, operated by SpaceX | Carries the crew, performs orbital maneuvers, docks, undocks and returns to Earth. |
| Mission and station operations | NASA, working with SpaceX and other partners | Sets requirements, oversees the mission, monitors operations and coordinates crew and station activities. |
NASA’s Commercial Crew Program includes more than one commercial transportation effort, but a SpaceX trip uses Crew Dragon and Falcon 9; another provider’s vehicle is not part of that flight.
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How astronauts get to the ISS
1. Prepare the launch and check safety conditions
NASA lists Kennedy Space Center’s Launch Complex 39A and Cape Canaveral Space Force Station’s Space Launch Complex 40 as Dragon launch locations. Before liftoff, mission teams assess weather and public safety around the launch pad and along the flight path. NASA and the U.S. Space Force monitor and control range-safety elements for Florida’s Eastern Range.
Weather is only one part of the decision. The teams also need the launch range and public-safety arrangements to be ready. If conditions or readiness do not satisfy the applicable criteria, the launch can be delayed rather than proceeding on the original schedule.
2. Launch Dragon on Falcon 9
At launch, the astronauts are inside Crew Dragon, mounted on top of Falcon 9. The rocket carries the spacecraft through ascent and places it on its planned orbital trajectory. Dragon’s integrated launch escape system is designed to move the capsule and crew away from the rocket if an emergency occurs during launch or ascent. NASA identifies eight SuperDraco thrusters in that system.
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The escape system is a contingency, not the normal way the crew separates from the rocket. In the planned mission, Falcon 9 completes its launch role and Dragon continues toward the station on its own.
3. Adjust Dragon’s orbit and approach the station
Once in orbit, Dragon performs phasing maneuvers—carefully timed changes to its orbit that let it catch up with the moving ISS and approach it. A NASA press kit describes arrival no later than the next day for the missions covered by that document. That is a description of those mission profiles, not a guarantee that every Dragon flight takes the same amount of time.
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Approach is planned and monitored rather than treated as a direct, instantaneous flight from launch pad to docking port. Mission control teams follow the maneuvers as Dragon closes the distance. The spacecraft is designed to dock autonomously, while retaining the option for the crew to take control and pilot manually if necessary. Automation performs the routine sequence; it does not mean the crew or ground teams stop monitoring the flight.
4. Dock with Harmony
Dragon docks at the forward-facing port of Harmony, a module on the ISS. After the docking sequence is complete, the spacecraft is attached to the station and the crew can enter the ISS according to mission procedures. The arriving astronauts then join the station’s existing expedition crew.
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What happens when a crew arrives
A crew rotation includes an overlap rather than an instant swap. The arriving astronauts are welcomed by the resident crew and work with them during a handover. That overlap lets the incoming team take on science and maintenance work while the outgoing team is still there to transfer knowledge and ongoing responsibilities.
For a period, both crews are aboard the ISS. The departing astronauts then return in the Dragon assigned to their flight. This is why a crew’s return is not simply the moment a new crew docks: the station must complete the handover and the return flight must be ready to go.
How NASA decides when and where a Dragon returns
A return is planned around a suitable departure window, weather and recovery readiness, not a permanently fixed taxi-home timetable. NASA mission managers review supported splashdown sites and conditions at several decision points before departure and during free flight. One NASA operational reference describes reviews roughly 24 to 48 hours before departure, another review at six hours, and a go/no-go decision approximately 2.5 hours before undocking. Those are timings from that reference and can vary by mission or operating configuration.
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Teams assess whether conditions will allow both a safe landing and a safe recovery. Factors include wind, waves, lightning and rain, as well as whether recovery helicopters can operate safely. A landing site that is acceptable for the spacecraft may still not be suitable if the recovery operation cannot be conducted safely.
- Continue toward the planned return: If weather and recovery conditions meet the applicable criteria, teams can proceed with the planned sequence.
- Delay departure: If conditions are not suitable, teams can wait for a safer opportunity rather than undocking on schedule.
- Use another supported site: Teams may adjust to a different supported landing location. NASA describes selecting a backup site and coordinating with the Federal Aviation Administration and the Coast Guard to protect the landing zone.
The landing coast is not universal. NASA operational materials describe different site configurations for different missions and operating periods, including California coast sites in one launch-and-return operations reference and seven potential Florida coast sites in an older rescue-and-recovery reference. The particular supported landing locations depend on the mission and configuration; no single coast should be presented as the permanent Dragon landing site.
How astronauts return to Earth
1. Undock and depart the ISS
When mission managers give the go-ahead, the departing crew boards its Dragon and the spacecraft undocks from Harmony. Dragon then performs departure maneuvers to move safely away from the station. Undocking is followed by a planned sequence, rather than an immediate fall from orbit.
2. Perform the deorbit burn
Dragon later performs a deorbit burn, a controlled change in its trajectory that targets the spacecraft’s path back into Earth’s atmosphere. Return planning accounts for where the capsule should come down and whether the selected splashdown area and recovery forces are ready. Weather and site conditions remain relevant during the return, not just at the earlier undocking decision.
3. Reenter and splash down
Dragon is designed to land in water. After it reenters the atmosphere and reaches its planned landing area, the capsule splashes down for recovery. NASA’s operations description emphasizes that recovery teams check the capsule and the surrounding area for hazards before hoisting the spacecraft aboard a recovery vessel.
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4. Recover the capsule and crew
Recovery teams approach by boat and carry out the checks needed before bringing the capsule aboard. The astronauts exit for initial medical checks and are transported to shore. NASA describes the post-landing recovery process as taking about an hour, depending on conditions; that is an approximate operational figure, not a fixed duration for every splashdown.
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Safety is built into several stages of the journey. Before launch, weather and range-safety checks help determine whether the vehicle can launch without creating unacceptable risk to the public. During ascent, Dragon’s launch escape system is intended to carry the crew away from the rocket if an emergency occurs. During routine orbital operations, automated systems support approach and docking while astronauts and mission control monitor the spacecraft and retain the ability to intervene where necessary.
The return has its own decision points because a capsule landing is only one part of a successful recovery. Teams also need suitable sea and weather conditions, a usable site, and support personnel able to reach the spacecraft safely. NASA describes launch abort resources along the flight path, rescue teams and contingency landing plans. In an emergency, the landing location may depend on the spacecraft’s orbit, weather and the proximity of rescue teams, rather than the nominal splashdown plan.
These arrangements explain the difference between routine automation and operational judgment. Dragon can execute a planned docking sequence without continuous manual piloting, but people continue to monitor it. Likewise, return plans identify landing options, but teams must still make go/no-go decisions as conditions change.
How many astronauts can Crew Dragon carry?
NASA’s Commercial Crew spacecraft reference lists Dragon as capable of carrying up to seven passengers. NASA missions, however, carry up to four crew. These numbers describe different things: the vehicle’s stated maximum passenger capacity and the crew complement used for NASA missions. They should not be treated as interchangeable, nor does the maximum capacity mean each NASA flight carries seven astronauts.
Quick Recap
The whole trip at a glance
- Launch: NASA and SpaceX teams check launch and range conditions; Falcon 9 lifts Crew Dragon from a Florida launch site.
- Orbit and approach: Dragon separates from its launch vehicle, performs phasing maneuvers and approaches the ISS while teams monitor the flight.
- Docking: Dragon docks autonomously at Harmony’s forward-facing port, with manual crew control available if needed.
- Handover: The incoming crew joins the station crew, transfers work and overlaps with the crew it will replace.
- Return decision: Teams evaluate weather, sea conditions, supported landing sites and recovery readiness before departure and during return.
- Return and recovery: The departing crew undocks, Dragon performs departure maneuvers and a deorbit burn, then splashes down for checks, capsule recovery and crew medical assessment.
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