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Ontario Indoor Playground Birthday Parties

5 indoor playgrounds in Ontario, California host birthday parties — 3 with party bookings confirmed on the venue's own site. They're ranked below by local reputation (rating weighted by review count). Weekend slots go first everywhere, so start calling 3–4 weeks out.

1. LOL KIDS CLUB - ONTARIO, CA

4.2 ★★★★☆ 1,688 reviews

735 N Milliken Ave # A, Ontario, CA

Hosts birthday parties Toddler-friendly

Open-play admission runs around $29 — party packages are quoted separately, so ask when you book.

“Had our 5th birthday there and the kids loved it! Getting everyone in was a little chaotic and the cooked food was 2/5. We also had an ac issue in our party room, which was never…” — Misty

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2. Kids Empire Ontario

4.7 ★★★★★ 1,150 reviews

130 W G St, Ontario, CA

Hosts birthday parties

3. iFLY Indoor Skydiving - Ontario

4.7 ★★★★★ 586 reviews

4510 Ontario Mills Pkwy, Ontario, CA

Hosts birthday parties

“Omg this was a super cool first experience for my sons 13th birthday with a friend. He and his friend were both nervous initially, but the instructors were so much fun and…” — Tenderlie

4. Slick City Action Park

4.4 ★★★★☆ 251 reviews

4655 Mills Cir, Ontario, CA

Hosts birthday parties Toddler-friendly Sensory-friendly

Open-play admission runs around $40 — party packages are quoted separately, so ask when you book.

“We had the honor of being the first birthday party hosted at Slick City Ontario, CA location. We loved everything Megan was awesome she helped accommodate are large group and…” — Top

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5. Play Street Museum - Ontario

5 ★★★★★ 38 reviews

910 N Haven Ave #150, Ontario, CA

Hosts birthday parties Toddler-friendly

Open-play admission runs around $23 — party packages are quoted separately, so ask when you book.

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Booking a party in Ontario: the short checklist

  1. Book 3–4 weeks ahead — Saturday afternoons fill first. A Sunday-morning or weekday slot is easier to land and sometimes cheaper.
  2. Ask: exclusive use or shared floor? Some packages close the playground for your group; most give you a private party room while open play continues around you. Both work — just know which you're getting.
  3. Put grip socks on the invitation. Most venues require them for every child on the equipment, party guests included. Ask if they're included in the package or sold at the door.
  4. Sort the deposit and waivers early. Expect a deposit to hold the slot — check the refund and reschedule policy. If the venue has an online waiver, send the link with the invites so check-in isn't a paperwork line.
  5. Confirm the cake rules. Most venues let you bring your own cake; some charge for other outside food. Pizza add-ons are the standard route.

Party venues near Ontario

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