4 min read

A hotel can set a record for revenue and still keep less of each dollar it earns. That’s the core problem behind flow-through. Many owners never track it directly. Lodging Magazine’s José Roa lays out the math, and it’s worth a close look if you own or invest in hotels.

What flow-through is, and why it matters

Flow-through is the change in gross operating profit (GOP) divided by the change in total revenue. GOP is what’s left after a hotel pays its direct operating costs. It comes before fixed charges like debt service and property taxes. Flow-through tells you how much of each new revenue dollar lands in that profit line.

Roa’s hypothetical hotel shows how this plays out. Revenue rises from $14 million to $15.2 million, an 8.6 percent gain. GOP only moves from $5 million to $5.1 million. Flow-through works out to 8.3 percent. The GOP margin drops from 35.7 percent to 33.6 percent.

Occupancy, average daily rate, and revenue per available room can all look healthy during this. None of them tells you what the extra revenue cost to earn.

Where the margin goes

Not all revenue is equal.

A higher rate on rooms that would have sold anyway usually adds little cost. Extra occupied rooms are different: they bring housekeeping labor, laundry, amenities, utilities, and often a commission to whoever sent the guest.

Distribution is the biggest hidden cost for many owners. In Roa’s scenario, online travel agencies grow from 22 percent to 34 percent of rooms revenue, with commissions near 18 percent. A low-season wholesale contract can also fill rooms at rates that look fine on paper. Yet it can leave little profit once variable costs are paid.

The broader numbers point the same direction. HotStats, released with Duetto, found that global RevPAR grew 19 percent since 2019. Over the same period, the cost of acquiring bookings per available room rose 25 percent. CBRE’s survey of 2,216 U.S. hotels, cited in the same piece, showed revenue up 2.6 percent in 2025. Operated expenses rose 3.0 percent.

Two hotels with identical revenue growth can produce very different profit outcomes.

Purchasing is a profit lever too

Revenue management gets most of the attention. The cost side offers another path. A whitepaper sponsored by Walmart Business, titled Profit in the Details: How Smarter Purchasing Is Boosting Hotel Margins, argues that hotels can find savings by connecting procurement data with operational data. Because the piece is sponsored, read its claims as the sponsor’s position and check them against your own invoices.

The practical version is simpler. Pull twelve months of supplier spend and group it by category. Then compare cost per occupied room across properties. A gap that looks small on a single invoice can add up across a year of linens, food, and cleaning supplies.

What owners should watch next

STR president Amanda Hite projected 4 percent GOPPAR growth for 2026 in an August forecast update from CoStar and Tourism Economics. She also warned about expenses.

“Rising expenses continue to be worrisome, increasing by more than the rate of inflation in both 2026 and 2027.”

Amanda Hite, President, STR

If expenses keep outpacing revenue, owners who understand flow-through will spot the squeeze sooner. Newer investors should build the metric into acquisition models and asset reviews from day one. Owners who already run hotels can start by checking their own numbers for the last twelve months.

For more on how investors are weighing these pressures, read our piece on hotel investment trends in acquisitions and technology. You can also find ownership resources and upcoming programs at the Latino Hotel Association website.