National record holder Khushbir was the first to take the field and she clocked 1 hour 36 minute and 41 seconds, more than two minutes outside her season best of 1 hour 34 minute and one second, to finish 42nd out of 52 competitors who completed the race.
The 24-year-old Punjab athlete, who has a personal best of 1:31:40, had produced her season's best at the IAAF Race Walk Challenge at Taicang in China in April.
At the 15km mark, she was at 39th with a time of 1 hour 10 minute and 55 seconds. Yang Jiayu of China won the race in 1 hour 26 minute and 18 seconds.
Maria Gonzalez of Mexico and Antonella Palmisano of Italy took the silver and bronze with efforts of 1:26:19 and 1:26:36 respectively.
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In the 2016 Rio Olympics, Khushbir had finished 54th with a timing of 1:40:33.
"I was in the top 15 till the 8km mark but after that I started feeling pain on my right leg and I even thought of stopping the race. But I somehow completed the race. So I had to slow down in the second part of the race. The conditions, the temperature was all right though the race started after 12pm. I wanted to do better but I could not fo it," Khushbir told told PTI after the race.
Irfan, on the other hand, clocked 1 hour 21 minute and 40 seconds, less than one minute outside his season's best of 1:20:59 to finish at 23rd out of 58 competitors who completed the race.
The 27-year-old Irfan, who jointly holds the national record of 1:20:21 along with Devender Singh, had a good race till the halfway mark but then he slowed down at the second half. He was at 16th spot at the 5km mark and moved up to 13th at the halfway mark with a very good timing of 39 minute 51 seconds. He was at 14th till the 15km mark but he could not maintain his speed in the last five kilometers and his opponents overtook him one after the other.
"The temperature is high and I could not conserve energy. We have never trained for a 2pm start (the race began at 2:20pm local time), it is strange. I don't know why they started the race when the temeperature was rising.
"Before the start, I said to myself that this is World Championships and the best are taking part here and it is good time that I run below 1 hour 20 minutes and break national record. But it did not happen, so I am disappointed," Irfan said.
India thus ended their World Championships campaign on a dismal note.
Davinder Kang was the best performer as he upstaged world junior record holder Neeraj to become the first Indian to qualify for men's javelin throw final round in any World Championships. Kang though finished 12th out of 13 competitors in the final round.
Govindan Lakshmanan was the other athlete who has done well in the championships by clocking his personal best of 3 minute and 35.69 seconds in men's 50000m race.
In field events, Annu Rani failed to make it to the final round in women's javelin as she finished 20th overall with a best throw of 59.93m. Heptathlete Swapna Barman finished a lowly 26th while T Gopi and Monika Athare ended at 28th and 64th in men's and women's marathon respectively.
The women's 4x400m relay team was disqualified for lane infringement in the first round heats while their male counterparts finished 10th overall to be eliminated.
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