Measured, not guessed
What is the cheapest site to book hotels?
Honest answer: there isn't one. Here's the data.
Every list that crowns one booking site "the cheapest" is guessing. We measured it: in 17 snapshots from September 22 to October 10, 2026 we recorded 7,044 hotel prices in 368 cities on every booking site Google Hotels lists. The pattern was blunt: at 5,114 of them (73%) some site listed the stay 5% or more below the going rate, typically 17% below, about $23 a night. Super.com was lowest most often, at 1,340 hotels. But at 4,294 of those 5,114 hotels the lowest-priced listing named no room at all. So "which site is cheapest" is the wrong question. The right one is how to use each class of site for what it's good at. Here's the playbook.
Nobody paid to appear here, and our comparison shows the lowest listed price no matter whose it is. If you book through Underbook we may earn a commission, which never changes which rate we show.
What we measured, in plain terms
Across 17 snapshots from September 22 to October 10, 2026 (7,044 hotel prices, 368 cities, US market):
The two findings that matter
- At 72% of hotels some site listed the stay 5% or more below the going rate, typically 17% below (about $23 a night)
- Super.com was the lowest-priced site most often (1,340 hotels, typically 18% below the going rate), but no one site always won
The two catches that matter
- At 4,294 of the 5,114 hotels with a cheaper listing, the lowest-priced one named no room; Super.com named it at none
- A cheaper listing with a matching room name was uncommon: 515 of 5,830 hotels (8.8%) on our original room check (952, or 16.3%, on the stricter October 1 check) in the 14 snapshots of September 25 to October 1, 2026 that compared room names
So how do you actually pay less?
Don't expect the household names to settle it. Booking.com, Expedia, Hotels.com, Priceline and their siblings share supply and sign rate parity agreements, yet at the 245 hotels listing both Expedia and Booking.com in our September 25 snapshot, their lowest prices were within $2 a night at only 54%. Even Booking.com, listed at 90% of hotels, was at or below every other site at only 846 of 4,729 hotels (18%) where its price could be compared like with like (does Booking.com have the cheapest prices?). The going rate is the price most sites agree on, and the lowest-priced listing often comes from another class of site: resellers (Super.com, Vio.com, Algotels and similar) below it, with strings attached: prepaid, strict cancellation, and room details you must verify yourself.
That gives you an honest decision rule. If your dates are locked and you'll verify the room and terms before paying, a wholesale rate is where the real price gaps are; treat it as a lead worth checking, not a sure thing. If you value flexibility or loyalty benefits, book refundable at the going rate, direct with the hotel, and know the trade: the cheaper listing was typically 17% below, but at 4,294 of the 5,114 hotels with one it named no room. The extreme end of the discount-for-certainty trade is opaque booking, where even the hotel's name stays hidden until you pay; we've broken down when Priceline Express Deals are worth it separately.
And use time as well as tabs: hotel prices move constantly (in our early tracking, half the hotels we watched changed price within a single day). A refundable booking you keep watching can still catch a later dip. That's what price drop alerts are for.
The 3-step cheap-booking routine
- 1. Get the going-rate baseline. Check two mainstream sites or the hotel's own site for your room's all-in price. The lower one is the number to beat.
- 2. Check the wholesale layer. If a reseller quotes meaningfully less, verify the room type, all-in total, and cancellation terms before paying.
- 3. Let time work. If your trip is weeks out, watch the price and book on a drop instead of accepting today's number.
Or let the comparison run itself
Everything above is doable by hand; it's just tedious enough that almost nobody does it for every booking. Underbook is a free hotel comparison website and browser extension that runs the routine automatically while you shop: it compares your hotel and dates across booking sites on an all-in basis, surfaces the wholesale layer the big sites won't show you, and tells you plainly whether the lowest-priced listing's room name matches yours or it is an unverified lead to check.
That last part is the honest core of the product: most "cheapest site" claims fall apart on room matching, so Underbook never pretends. When we can confirm the room, we say so. When we can't, we flag it and tell you what to verify before booking. And if you're not ready to book, check and watch the price and we'll email you when it drops.
Where to book: questions, answered honestly
Is there really no single cheapest booking site?
Really. Even the big brands split: at the 245 hotels listing both Expedia and Booking.com in our September 25 snapshot, Expedia was more than 2% cheaper at 49 and Booking.com at 56. The site with the lowest price varies hotel by hotel. In our study of September 22 to October 10, 2026, Super.com was lowest most often, yet only at 1,340 of the 5,114 hotels where some site beat the going rate by 5% or more. Any article naming one permanent winner is selling something.
Do the big sites all show the same price?
Often not. Hotels distribute rates to major channels, and parity agreements plus competitive matching pull the public price together, but not all the way: at the 245 hotels listing both Expedia and Booking.com in our September 25 snapshot, their lowest prices were within $2 a night at 54%. That's why we compare them all, and why we wrote a whole page on whether the same room is cheaper elsewhere.
The wholesale rate is 30% cheaper. What's the catch?
Three usual suspects: it's prepaid and non-refundable, the room may be a different class than the one you compared (resellers rarely publish full room detail), and taxes or fees may only surface at final checkout. In our snapshots of September 22 to October 10, 2026, Super.com named the room at none of the 1,340 hotels where it was lowest and showed no free-cancellation label at any of the 3,740 hotels listing it. Verify those three things before trusting that discount; skip that and you're gambling.
Do hotel comparison sites show every booking site?
No. Metasearch engines show sites they have relationships with, and the ordering reflects commercial factors, not just price. Wholesale rates are frequently buried pages deep or missing entirely. Underbook shows the lowest price among the booking sites Google Hotels lists for your hotel and dates, smaller sites included, and says whether that listing names the same room; a site Google Hotels does not list is missing from its comparison too.
How does Underbook make money?
So far it hasn't; it's a free tool built to prove that honest comparison is useful. If you book through Underbook we may earn a commission, which never changes which rate we show. No booking site pays us for placement, which is exactly why we can show a wholesaler above a household name when the wholesaler is cheaper, and say to check before booking when the room names don't match.
Where these sites show up
The prices in our study are the ones Google Hotels showed. It listed a median of 17 booking sites per hotel, and the lowest price was usually on a smaller one: which booking sites Google Hotels shows.
Smaller sites on Google Hotels, measured
Some sites Google Hotels lists usually showed another site's price. goSeek matched Vio.com's at 1,804 of 2,328 hotels listing both and Etrip.net at 2,823 of 2,833; Long Stay Discounts was never recorded as the lowest. Our reviews: Is goSeek legit?, Is Etrip.net legit? and Is Long Stay Discounts legit?. Hotel Booking Zone usually showed Booking.com's price (1,224 of 1,737), HotelsCombined showed KAYAK's at all 1,045, PriceTravel was recorded as the lowest at 19 of its 313 hotels, and Tripening was more than 2% above the going rate at 900 of 1,030: Is Hotel Booking Zone legit?, Is HotelsCombined legit?, Is PriceTravel legit? and Is Tripening legit? Five more, measured the same way: müvTravel and ZenHotels usually showed an Expedia Group site's price, and ZenHotels was never recorded as the lowest; BusinessHotels.com was more than 2% above the going rate at 327 of 868 hotels; Catchit was lower than Booking.com more often than not where the two differed; Hostelworld was listed at 140 hotels: Is müvTravel legit?, Is ZenHotels legit?, Is BusinessHotels.com legit?, Is Catchit legit? and Is Hostelworld legit? CHECK24, a German comparison portal that also books, was listed at 156 hotels, almost all in Europe, and never recorded as the lowest: Is CHECK24 legit?
Real prices, hotel by hotel
Every site's price at 5,970 hotels in 368 cities
From our price snapshots of September 25, 2026, September 28, 2026, September 29, 2026, September 30, 2026, October 1, 2026, October 3, 2026 and October 10, 2026: each hotel's page lists every booking site Google Hotels showed, the going rate, and whether the lowest-priced listing named a room, with a button to check today's price for your own dates.
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Stop guessing which site has the lowest price.
Underbook compares the price for your hotel and dates, all-in where the sites report taxes and fees, across mainstream sites and the wholesale layer, says whether a cheaper listing names the same room, and watches for drops. Free, and you always book where you choose.
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