Shares in the FTSE 250 retailer rose 148p to 2124p as it grew turnover by 4 per cent in the 13 weeks to June, with same-store takings up 1 per cent on the previous year.
Travel business was the star performer as growth in passengers boosted sales by 8 per cent, with a wider choice of healthy food options.
The company attributed the growth to “continued investment in our UK and international businesses and growth in passenger numbers”.
WH Smith is opening between 15-20 travel outlets in the UK and 10 overseas as high street sales fell by 1 per cent.
Chief executive Stephen Clarke remains confident in the outcome for the full year.
Stephen Clarke, group chief executive, said: “We have delivered a good sales performance in the third quarter in both our travel and high street businesses.
“Whilst there is some uncertainty in the broader economic environment, WHSmith serves millions of customers each week and continues to grow both internationally and in the UK.
“We continue to focus on profitable growth, cash generation and investing in the business to position us well for the future.
“We remain confident in the outcome for the full year.”