The number of US consumers researching and booking travel online is still growing. More than 114 million people will research travel online this year, and 93.9 million will book it.

But the percentage of US internet users doing so has stabilized. The online travel market is now mature, and only modest growth in the percentage of all trips booked online is expected.

Growth in spending is coming largely from a rise in airfares, hotel rates and ancillary fees, which increase the aggregate dollar amount of online bookings.

This year, eMarketer estimates, the average amount each online travel booker will spend is $1,145. That will go up to $1,213 next year.

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