The Franco-Swiss airport of Basel-Mulhouse was evacuated and closed due to a bomb alert on Friday.
An Air France flight to Paris was on standby at the airport due to the bomb alert, the airline told Reuters.
However, around two hours later it stood down the alert.
The Basel-Mulhouse EuroAirport said on X: “The airport has reopened, and flight operations are gradually restarting. Passengers are requested to contact their airline for information about their flight. We wish you a safe and happy journey.”
It earlier said the terminal was evacuated and closed, with flight operations temporarily suspended.
EuroAirport, which is located on the French side of the border near Basel, welcomed eight million passengers last year.
It serves airlines such as Lufthansa, KLM and Ryanair.
A passenger, replying to a post from their airline, said on X: "We were supposed to board one of your flights at 12 o'clock at Basel EuroAirport but the airport has just been evacuated due to a possible bomb threat.”
It comes just hours after France’s high-speed rail services were thrown into turmoil after a series of fires were “deliberately set” ahead of the Paris Olympics ceremony on Friday.
French authorities said the railways had been targeted in "co-ordinated" vandalism ahead of the Olympic Games.
Eurostar was forced to cancel several trains to Paris with others delayed or diverted because of the disruption,
French rail company SNCF said a series of incidents overnight had affected travel to and from London beneath the Channel, to Belgium and across the west, north and east of France.
French transport minister Patrice Vergriete told broadcasters incendiary devices had been discovered and people had fled from fires.
It was not immediately clear if the bomb alert at EuroAirport was connected to heightened security amid the track fires targeting French railway lines.
France is deploying 45,000 police, 10,000 soldiers and 2,000 private security agents to secure the Olympics opening ceremony later on Friday.
Snipers will be on rooftops and drones keeping watch from the air.
Britons going to the ceremony fear they will have to "rush" to make it on time because of Eurostar delays.
Adam Wigley is planning to attend the ceremony and was meant to get into Paris at 3.48pm but will now arrive at least an hour later.
The 28-year-old from Norfolk said: "I'm unclear on the system. It's a little difficult to see what's going on.”
