The Certify report also looked at the most expensed restaurants overall.
As McDonald's struggles to turn around its U.S. business, the business traveler appears to be a bright spot for the chain. Still, the fast-food giant lags in frequency behind Starbucks, which accounted for 4.57 percent of expenses among restaurants. In breakfast, the coffee chain drew 13.59 percent of transactions—earning it the title of the most expensed breakfast spot.
At lunch and dinner, McDonald's is the restaurant of most frequent choice.
Its overall share of total expensed meals grew to 2.99 percent in the third quarter from 2.68 percent in the second quarter.
McDonald's average meal cost is also significantly lower than the majority of the top 15 most expensed spots.
This report comes as McDonald's struggles to turn around its domestic business. During the second quarter, comparable sales shrank 1.5 percent. Negative trends persisted in July and August, and the chain recently ranked last for taste in Consumer Reports' burger rankings.