Myth, checked
Does clearing cookies lower hotel prices?
Short answer: usually not.
Usually not. When a 2014 Northeastern University study (Hannak et al., IMC 2014) tested the tip on six booking sites, a browser that cleared its cookies after every search was never shown a lower price; the lower prices it found went to signed-in members and mobile users. The price you see moves with real demand, your dates, availability, and currency, not with whether a site remembers you. Worse, a private window logs you out of the member rates that were genuinely saving you money. Here is what is really going on, and the handful of things that do lower the price.
Free. If you book through Underbook we may earn a commission, which never changes which rate we show. We show the cheaper rate, whoever has it, and whether it names your room.
The verdict, in plain terms
Clearing cookies is harmless to try, but it is not a reliable way to save. The price differences people notice are real, they just do not come from your browser history.
What the cookie trick can't do
- There's no consistent evidence it lowers prices
- Incognito logs you out of member and app-only rates
- Sites don't reliably punish you for looking twice
- Any drop is usually demand moving, not your cookies
What genuinely lowers the price
- Comparing the all-in total across booking sites
- Being flexible on your dates when you can
- Signing in for member rates, not clearing cookies
- Watching the price and booking when it dips
Why the myth feels true
The reason this tip spreads is that people really do see prices change. You check a room on Monday, look again Wednesday, and the number is different, so it feels like the site is watching you and nudging the price up. The mistake is in the cause, not the observation. Hotel rooms use dynamic pricing: the rate moves with live demand, how many rooms are left, the day of week, the season, and sometimes short-lived price tests. All of that shifts on its own, whether or not you ever visited before.
The one controlled test we can point to is a 2014 Northeastern University study (Hannak et al., IMC 2014). It ran matched browsers side by side on six booking sites, including one that cleared its cookies after every search. That browser was never shown a lower price. On Expedia and Hotels.com, clearing cookies dropped it into a different A/B test group, which changed which hotels were listed and in what order, not what they cost. The lower prices it did find went the other way: signed-in members on Orbitz and Cheaptickets saw about $12 off on about 5% of hotels, and iOS users on Travelocity about $15 off on about 5%. The study is from 2014, so treat it as evidence, not a guarantee about today; we have not run a cookie test ourselves.
The part that actually costs you money
A private window signs you out. Many booking sites and hotel loyalty programs show lower member or app-only rates only when you are logged in. So the cookie-clearing ritual can quietly do the opposite of what you wanted, hiding a discount you had already earned. If anything, staying signed in is the move, not scrubbing your session.
What actually lowers the price
The savings that hold up are boring and repeatable. The biggest one is simply comparing the all-in total for the same room and dates across sites. The same hotel often shows different totals on the hotel's own site, on Booking, on Expedia and on the resellers on the same day, because each negotiates and marks up differently. The catch is that the cheapest listing often does not say which room it is; when the room checks out, that gap is real money, and it has nothing to do with your cookies.
After that: be flexible on dates when you can, since a shift of one night can cross a demand threshold; sign in so you see member and mobile rates; and watch the price over time so you book on a dip instead of the first number you saw. Those four levers beat every incognito trick, because they act on the thing that really sets the price rather than on a myth about being tracked.
Skip the ritual, check the real number
Instead of clearing cookies and hoping, the reliable move is to compare the all-in total for the same room and dates across the hotel and other booking sites. Doing that by hand across five tabs is tedious, which is exactly why most people reach for a shortcut like incognito that does not really work.
Underbook is a free Chrome extension that runs that comparison for you while you shop. When you are looking at a hotel, it checks other sites for the same hotel and dates and shows the prices side by side (all-in when the sites report taxes and fees) and says whether the cheaper listing names the same room. When the room names don't match, it says to check before booking rather than pretending. No cookie tricks, just the cheapest rate we can find, and a plain note when it may not be your room.
Cookies and hotel prices: common questions
Does clearing cookies actually lower hotel prices?
Usually not in any reliable way. In the one controlled test we know of (Northeastern University, 2014), clearing cookies never produced a lower hotel price on six booking sites. When the number does change, it is almost always live demand, availability, currency, or logging out of a member rate, rather than a site personally marking you up. Try it if you like, but do not count on it to save money.
Does incognito mode make hotels cheaper?
Not reliably, and it can backfire. A private window logs you out, so you can lose signed-in member and app-only prices that were genuinely lower. The occasional cheaper number in incognito is usually normal price movement that would have appeared anyway. Use it as a quick sanity check, not a savings plan.
Do sites raise the price if I keep checking the same room?
There is no solid evidence they quietly punish you for revisiting. Prices move while you shop because of dynamic pricing tied to real demand and shrinking availability, plus occasional A/B tests. The price can drop between visits just as easily as it rises. What feels like being tracked is almost always the room simply getting more or less available.
So what actually makes a hotel room cheaper?
Compare the all-in total, after taxes and fees, for the same room and dates across the hotel's own site and a couple of booking sites; be flexible on dates when you can; sign in for member and app-only rates; and watch the price so you book on a dip. The comparison step is the biggest lever, because the same hotel is often listed for less somewhere else on the same day.
Does Underbook clear cookies or do anything sneaky?
No. Underbook does not touch your cookies or play pricing tricks. It simply compares the price for your hotel and dates, all-in where the sites report taxes and fees, across booking sites while you shop and shows you the cheaper rate, and it tells you when the room names don't match. The saving comes from the comparison, not from hiding your history.
Real prices, hotel by hotel
Every site's price at 5,644 hotels in 348 cities
From our price snapshots of September 25, 2026, September 28, 2026, September 29, 2026, September 30, 2026 and October 1, 2026: each hotel's page lists every booking site Google Hotels showed, the going rate, and whether the cheapest listing named a room, with a button to check today's price for your own dates.
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Stop clearing cookies. Start comparing.
Underbook compares the price for your hotel and dates, all-in where the sites report taxes and fees, across booking sites, so you can see the real cheapest rate instead of hoping a browser trick worked. Free, and you always book where you choose.
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