Where to hold a conference in Ontario
Everything an organizer needs before committing a date in Ontario, California — 6 mapped venues, capacity where it is published, airport distance and local time.
What Ontario has to put people in
Ontario has a recorded population of 185,285 (2024), inside the Riverside-San Bernardino-Ontario, CA area of about 4.7 million people.
Counted by what they are for, that is 1 exhibition or convention hall, 3 dedicated conference and function spaces and 2 independent event spaces.
That works out at about 3 venues per hundred thousand residents, so the field is thin relative to the population and the larger rooms book out a long way ahead.
By type that is 2 hotels with function space, 2 event spaces, 1 banquet hall and 1 convention centre.
Exhibition and convention halls (1)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| Ontario Convention Center | convention centre | not published | 4.1 km (2.5 mi) |
Conference and function space (3)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| Comfort Suites Ontario Airport Convention Center | hotel with function space | not published | 3.5 km (2.2 mi) |
| Treasure Banquet Hall | banquet hall | not published | 0.4 km (0.2 mi) |
| Quality Inn Ontario Airport Convention Center | hotel with function space | not published | 3.8 km (2.4 mi) |
Independent event spaces (2)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| Beverly Banquets | event space | not published | 0.1 km (0.1 mi) |
| Ontario Wedding Chapel | event space | not published | 0.7 km (0.4 mi) |
Every venue mapped in Ontario appears above. The ones with enough published detail to be worth reading have their own guide and are linked; the rest are named here, which is honest about what the record holds without giving each of them a page made of three facts.
Convention and exhibition space
One venue in Ontario is classified as exhibition or convention space.
- Ontario Convention Centersize not published
Capacities are the figure the venue or an encyclopaedia entry published. They are usually the seated maximum, and the same room in banquet or reception layout can differ by half. Confirm the layout you want before you plan around a number.
Travel, time zone and arrival
Los Angeles International Airport (LAX) is 71 km (44 mi) away, far enough that arrival day is genuinely a travel day and a first session before noon will lose people.
Local time is Los Angeles time (America/Los_Angeles) — set every session time in the app to that zone and let attendees' phones do the conversion.
Upland, Chino and Rancho Cucamonga are close enough to draw from for a day rate, and to fall back on if Ontario has nothing free on your dates.
- Nearest major airport
- LAX
- Los Angeles International Airport, 71 km (44 mi)
- Local time
- UTC−7
- America/Los_Angeles, in September
- City population, 2024
- 185,285
- 4.7 million across the Riverside-San Bernardino-Ontario, CA area
What to check before you commit
No published capacities
Not one Ontario venue publishes a capacity in the open sources behind this page. Every room on the list will quote you a number directly, but you cannot compare them before you call, so build a fortnight of venue calls into the plan.
Arrival is a half-day
71 km (44 mi) from LAX means most attendees lose a morning to travel. Open registration the evening before and put nothing you care about in the first slot.
The city is smaller than the market
185,285 people live in Ontario itself, but about 4.7 million live in the wider Riverside-San Bernardino-Ontario, CA. Your local audience is far bigger than the city line suggests, and so is the commute your day-rate attendees will make.
What event67 costs for a Ontario event
A Ontario programme at 240 activated attendees — a mid-sized Ontario programme, since no Ontario venue publishes a capacity in open data — prices like this. Nothing is charged for the first 50, and nothing at all is charged past 1,000.
- activated attendees
- 240activated attendees
- billable, after the first 50 are free
- 190billable, after the first 50 are free
- for the whole event, at $5 each
- $950for the whole event, at $5 each
You are billed for people, not for the venue, so the room you choose in Ontario does not change this figure. Nothing is charged for an attendee who registers and never opens the app.
By event type
No capacity is published for any Ontario venue, so match the format to the room on your site visit rather than to a number on a listing.
- trade shows and exhibitions
1 exhibition or convention hall means a booth plan is possible in Ontario without renting a marquee.
- multi-track conferences
The exhibition space here doubles as plenary space when the floor is cleared.
- association annual meetings
An association meeting needs one big room, several small ones and a hotel block, which is the combination Ontario is set up for.
- training days and workshops
3 purpose-built function spaces are the easiest kind of room to run a workshop in — the power and the load-in already assume it.
- leadership retreats
Smaller rooms suit a retreat better than a hall does, and Ontario has them.
Where this data comes from
- GeoNames, CC BY 4.0
- US Census Bureau, Vintage 2024 estimates
- Wikidata, CC0
- Geographic data © GeoNames, licensed under CC BY 4.0.
- Venue data © OpenStreetMap contributors, available under the Open Database License.
- US population figures are US Census Bureau Vintage 2024 estimates.
- Retrieved 3 September 2026. event67 has no commercial relationship with any venue listed.
Last updated
What it costs
- Free up to 50
- activated attendees, on one live event
- $5
- per activated attendee beyond 50
- $4,750
- the most one event can ever cost, whatever happens past 1,000
Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
Questions people actually ask
Price a Ontario event at 240 attendees — what is the total?
240 activated attendees means 190 billable after the free 50, so $950 for the event. The price is $5 per activated attendee beyond the first 50, and the total for one event stops at $4,750 however many more attend. Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
How big an event can Ontario hold?
No Ontario venue publishes a capacity in the open sources behind this page, so there is no honest number to quote. 6 venues are mapped here and each will quote a capacity directly. Ask for the seated, theatre and reception figures separately — they differ by a factor of two or more in the same room.
Does Ontario have a convention centre?
Yes — 1 venue is classified as exhibition or convention space in Ontario, including Ontario Convention Center. Exhibition halls are booked by floor area rather than by seat, so ask for the hall sheet with column spacing and load-in access rather than a capacity number.
Which airport do attendees fly into for Ontario?
Los Angeles International Airport (LAX), about 71 km (44 mi) from the city. It is the highest-traffic airport within reach in this dataset. Local time is America/Los_Angeles; publish every session in that zone and let attendees' phones convert it.
Is there a free tier for a small Ontario event?
One live event with up to 50 activated attendees costs nothing. Beyond that it is $5 per activated attendee beyond the first 50, and the total for one event stops at $4,750 however many more attend. Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
Keep reading
Nearby cities
- Holding an event in Upland
3 venues mapped
- Holding an event in Chino
1 venues mapped
- Holding an event in Rancho Cucamonga
8 venues mapped
- Holding an event in Pomona
8 venues mapped
- Holding an event in Eastvale
1 venues mapped
Up a level
Running something in Ontario?
Set the schedule, invite the room and watch who actually turns up. Free for your first 50 activated attendees, on one live event.