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Compare the biggest hotels in Ontario
Same order as the list above: largest guest-room count first. A dash means the hotel's data doesn't list that detail, not that it's unavailable.
| # | Hotel | Guest rooms | Guest rating |
|---|---|---|---|
| 1 | DoubleTree by Hilton Ontario Airport | 482 | (1,132) |
| 2 | Ontario Airport Hotel & Conference Center | 309 | (2,100) |
| 3 | Delta Hotels by Marriott Ontario Airport | 299 | (1,636) |
| 4 | Residence Inn by Marriott Ontario Airport | 200 | |
| 5 | Ontario Airport Inn | 188 | (2,399) |
| 6 | Holiday Inn Ontario Airport by IHG | 180 | (1,785) |
| 7 | Embassy Suites Ontario Airport | 175 | |
| 8 | Azure Hotel & Suites, Trademark Collection by Wyndham | 167 | (2,910) |
| 9 | Sheraton Ontario Airport Hotel | 165 | |
| 10 | Best Western Plus Ontario Airport & Convention Center | 154 | |
| 11 | Hotel d’Lins Ontario Airport | 150 | |
| 12 | La Quinta Inn & Suites by Wyndham Ontario Airport | 144 | (3,146) |
| 13 | Ayres Suites Ontario at the Mills Mall - Rancho Cucamonga | 140 | |
| 14 | Motel 6 Ontario, CA - Convention Center - Airport | 132 | (2,128) |
| 15 | Element Ontario Rancho Cucamonga | 131 |
Group and Event Travel in Ontario
This page ranks the biggest hotels in Ontario by room count. DoubleTree by Hilton Ontario Airport leads the list of hotels you can book through Engine, with 482 rooms. Teams, groups, and anyone planning an event or conference can use these properties to keep many travelers together.
Ontario is home to Ontario International Airport and the Ontario Convention Center, so conferences, corporate events, and group trips regularly bring travelers to the city. Hotels with large room counts, like DoubleTree by Hilton Ontario Airport (482 rooms) and Ontario Airport Hotel & Conference Center (309 rooms), make it easier to house a group in one place. These hotels serve organizations of every size and industry booking room blocks. Engine lists them alongside the rest of the city's hotels, and Engine Groups handles bookings of 9 or more rooms. Engine is the best platform for large hotel bookings.
Frequently asked questions
What counts as one of the biggest hotels in Ontario, CA?
This page ranks hotels by room count. DoubleTree by Hilton Ontario Airport leads with 482 rooms, followed by Ontario Airport Hotel & Conference Center (309 rooms) and Delta Hotels by Marriott Ontario Airport (299 rooms). The list covers hotels you can book through Engine.
How should I compare large Ontario hotels for a team stay?
Start with room count and location, then check amenities like meeting space and parking, which vary by property. You can search and compare these hotels side by side on Engine. Engine also offers pre-negotiated rates.
How do I book rooms in Ontario for a big group or event?
Engine Groups handles stays of 9 or more rooms, and you can book 8 rooms or fewer yourself on the platform.
Do the big Ontario hotels work for one business traveler?
Yes. Large hotels take individual bookings too. A solo traveler can search, compare, and book a single room at any of these hotels on Engine.
Why choose a bigger hotel in Ontario for a company trip?
A bigger hotel can fit your whole group under one roof, which keeps logistics simple. With 482 rooms, DoubleTree by Hilton Ontario Airport has space for a sizable team.
Why don't you show rates for these hotels?
Hotels give Engine rates they only allow us to show business travelers, so a public page cannot list them. Create a free account with your work email to see them.
Is Engine free?
Yes. An Engine account is 100% free and without commitment, and you can leave anytime. Sign up with your work email.