It turned out that the girl had missed her bus as she'd been waiting at the wrong stop - so the driver asked passengers for the number of a cab firm.
He arranged for a taxi to meet the girl at a nearby store and gave her enough cash to pay for it.
The driver's good deed was spotted by Lynsey Jayes, who praised him on Facebook.
"This bus driver on the number 16 this morning deserves a huge pat on the back... a young girl waiting for the bus at the wrong side of the road and was upset she would be late for her first day at high school," shew wrote.
"The driver not only phoned her a taxi, he walked her to Tesco and he paid for it... now that is a reason I don't mind my bus running late."
Her post has been shared nearly three thousand times.
As Ms Jayes says, "Not often you see such a kind act on the school run."
The bus driver's good deed held passengers up by a few minutes - but he checked with them first that this was ok, and operator First West Yorkshire doesn't seem to mind.
"We are delighted with the actions of our driver, who has shown exceptional customer awareness and consideration for this young girl, who was clearly very upset," it tells the Yorkshire Evening Post.
"First West Yorkshire is grateful to Lynsey Jayes for highlighting our driver's actions and to the many customers and other members of the public for their kind comments."
The company says the 44-year-old driver, who's been in the job for two-and-a-half years, will now be considered for an award.
World's funniest flight attendants
World's funniest flight attendants
A flight attendant pulled the ultimate prank on her passengers when she hid in an overhead locker to scare them. The stewardess' gag was caught on camera by traveller Holly McNamara on a Southwest Airlines flight from Los Angeles to Las Vegas. When an unsuspecting passenger opened the overheard compartment he appeared so stunned that he tried to close the locker again in confusion. Watch the video on YouTube.
In a hilarious landing announcement, cabin crew member Zach Haumesser impersonated around a dozen Looney Tunes characters to entertain passengers. As the Southwest Airlines plane touched down in Chicago, he launched his uncanny Elmer Fudd, Bugs Bunny and Daffy Duck impressions, asking guests to be "vewy, vewy quiet" and remain clear of the "doorth" for their "thafety" in the fabulous mash-up. Watch the video on YouTube.
In 2013, Sir Richard Branson shaved his legs, put on make-up and dressed in stewardess clothing after losing a bet with AirAsia CEO Tony Fernandes over which of their 2010 Formula One teams would beat the other at the Grand Prix in Abu Dhabi. The billionaire performed all the regular duties of a flight attendant, including cleaning the toilets, on the charity flight from London to Kuala Lumpur. Lucky for Branson, Fernandes allowed him to keep his signature beard.
Flight attendant Assraf Nasir's performance of Britney Spears' 'Toxic' on an empty Airbus A330 was every inch as fabulous as it sounds. A video, which went viral, showed Nasir singing into the intercom before strutting, shimmying and shaking down the aisle. His boss, Tony Fernandes of AirAsia, even reposted the brilliant video. Watch the video on Instagram.
A Southwest Airlines flight attendant had plane passengers in fits of giggles with an inflight safety demonstration that could have been a comedy act. A video, which viral, showed Marty Cobb saying she's had a "long day" before launching into her joke-infused demo. She says: "Position your seatbelts hard and low across your hips like my grandmother wears her support bra." Cobb adds: "No smoking, no whining, no complaining. No smoking in the lavatory - the fine is $2,000 and if you wanted to pay that for your air fare you should have flown with somebody else!" She then finishes: "Sit back and relax, or you can sit up and be tense." Watch the video on YouTube.
Steven Slater became an online celebrity when he quit his job as a flight attendant in the most memorable way imaginable. The JetBlue steward launched an expletive-ridden rant over the plane's public address system after a row with a passenger involving overhead baggage as the aircraft landed at New York's JFK. He then grabbed his bags and two cans of beer before popping the lever for the emergency chute and sliding down to the tarmac. Slate picked up his car and raced home, but police soon arrested him and he was charged with criminal mischief and criminal trespass. That didn't stop him becoming a national hero and a string of Facebook pages being set up by people admiring his grand exit.
We really have no idea why this flight attendant would suddenly break into a dance routine accompanied by the Bruno Mars track 'Uptown Funk,' but we're really glad she did. The terrific video was taken by passenger Simian King on a WestJet flight from Quebec, Canada. In a video of the impromptu performance, the air stewardess is seen swinging her hips and pumping her fists in the air as she dances enthusiastically. Watch the video on YouTube.
Air steward David Holmes became a YouTube hit when he was filmed rapping the safety demonstration to passengers on a Southwest Airlines flight. He was captured asking travellers to "stomp and clap" as he rapped the instructions over the public address system. He rapped: "Shortly after take-off, first things first/there's soft drinks and coffee to quench your first. Carry-on items go under the seat/in front of you so none of you have things by your feet." Watch the lyrical announcement on YouTube.
Passengers on a one-hour easyJet flight from London to Belfast were treated to an unusual fight between two flight attendants over the packing of water bottles. The incident was live-tweeted by TV presenter Dan Lobb, who described the situation as "unbelievable". The cabin crew members were eventually replaced after their "verbal disagreement" and easyJet apologised for the delay. Read the live tweets.
An air steward on a WestJet flight had passengers laughing, cheering and applauding after delivering a theatrical safety demo on the Canadian airline. The flight attendant spiced things up in the aisle in the most dramatic fashion, wildly acting out the safety requirements while delighted passengers watched the flamboyant routine. He stroked the safety card, blew a kiss to the camera and even used the oxygen mask as a beak. Watch the video on Facebook.