Throngs of passengers anxious to get on their way surged into Heathrow Airport in London on Saturday, a day after a power blackout closed the airport and forced thousands to delay their trips.

As information boards flickered back to life, an army of extra airport staff members, dressed in purple, sprang into action to help people as they walked through the terminal doors.

Ganesh Suresh, a 25-year-old student who was trying to get home to Bangalore, India, was among those who secured a coveted seat on a Saturday flight. After his Air India flight was canceled, his parents booked new tickets on Virgin Atlantic, while he spent the night at a friend’s place in Birmingham, England.

“I was so eager to get back,” Mr. Suresh said. He sheepishly admitted to yelling at his parents in frustration during the height of the shutdown chaos. “I might apologize to them when I get back.”

Travelers, diverted or rebooked, arrived early, with trains and other transport routes to the airport reopened. A day earlier, the airport’s roads were empty except for police cars.

A Heathrow representative said on Saturday that the airport was “open and fully operational,” adding that the extra flights on the day’s schedule could accommodate 10,000 extra passengers. At the airport, information boards showed that most flights would leave on time, but the snaking lines at ticketing counters signaled that many travelers were in for more frustrating delays.

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