The Westin O'Hare — Event Spaces, Floor Plans & Capacities

6100 N River Rd, Rosemont, IL 60018

48 rooms · largest space: Grand Ballroom, 12,069 sq ft1,121 m²

Planning an event in Rosemont? The Westin O'Hare has 48 meeting and event rooms. The largest space is Grand Ballroom, 12,069 sq ft1,121 m². It holds up to 1,500 guests. Capacity figures for every setup style are listed per room below.

Plan an event in Grand Ballroom: open a free to-scale layout seating 720 at round tables in its 81 × 149 ft footprint at floors.live/start — no account needed.

Between them, the 48 rooms accommodate theater-style sessions for up to 1,100, seated banquets for 910 and standing receptions for 1,500. 20 smaller rooms suit breakouts and board meetings. Per-room dimensions and every published setup figure are listed below.

Plan your event in this space — free

Unverified listing — compiled from The Westin O'Hare’s published information. Venue staff can verify capacities and setups free: floors.live/venues/us/illinois/rosemont/the-westin-o-hare/?claim=1.

Floor plans

Detailed floor plans for The Westin O'Hare are published on the venue’s official site.

View official floor plans at Marriott ↗Plan your event in this space — free

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Room capacities & dimensions

48 rooms, 56 configurations. Combined and divided set-ups are listed under their room.

Room capacities and dimensions for The Westin O'Hare
SpaceCeiling
AmbassadorPlan this room →660 sq ft61 m²12 ft3.7 m205020501010
BanksPlan this room →448 sq ft42 m²10 ft3 m3030212518—
BoardroomPlan this room →924 sq ft86 m²12 ft3.7 m————22—
BurtonPlan this room →448 sq ft42 m²10 ft3 m3030212518—
ClarkPlan this room →247 sq ft23 m²10 ft3 m————8—
DearbornPlan this room →725 sq ft67 m²10 ft3 m506048602227
Director's APlan this room →1,020 sq ft95 m²10 ft3 m607054753024
1 configuration with Director's A
Combined and divided set-ups that include Director's A
ConfigurationSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Director's A / BPlan this room →2,040 sq ft190 m²10 ft3 m1201201001604648
Director's BPlan this room →1,020 sq ft95 m²10 ft3 m607054753024
Director's Suite ParlorPlan this room →676 sq ft63 m²10 ft3 m503018501515
DivisionPlan this room →754 sq ft70 m²10 ft3 m506048602227
Executive ForumPlan this room →3,596 sq ft334 m²———215———
FranklinPlan this room →598 sq ft56 m²8 ft2.4 m————15—
FultonPlan this room →377 sq ft35 m²8 ft2.4 m2030302020—
GarlandPlan this room →247 sq ft23 m²10 ft3 m————8—
GrahamPlan this room →312 sq ft29 m²8 ft2.4 m1224151815—
Grand BallroomPlan this room →12,069 sq ft1,121 m²23 ft7 m9101,1007001,500——
Grand Ballroom Salon APlan this room →4,698 sq ft436 m²23 ft7 m350420250500—90
2 configurations with Grand Ballroom Salon A
Combined and divided set-ups that include Grand Ballroom Salon A
ConfigurationSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Grand Ballroom Salon ABPlan this room →8,262 sq ft768 m²23 ft7 m630720470900—175
Grand Ballroom Salon BCPlan this room →7,371 sq ft685 m²23 ft7 m560600440800—170
Grand Ballroom Salon BPlan this room →3,564 sq ft331 m²23 ft7 m280300220400—85
Grand Ballroom Salon CPlan this room →3,807 sq ft354 m²23 ft7 m280300220400—85
HigginsPlan this room →784 sq ft73 m²10 ft3 m407530503027
Lakeshore APlan this room →1,170 sq ft109 m²12 ft3.7 m8090751004044
1 configuration with Lakeshore A
Combined and divided set-ups that include Lakeshore A
ConfigurationSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Lakeshore RoomPlan this room →2,346 sq ft218 m²10 ft3 m1601501201506046
Lakeshore BPlan this room →1,176 sq ft109 m²12 ft3.7 m7080401004038
LaSalle BallroomPlan this room →5,428 sq ft504 m²13 ft4 m40045030052513275
LaSalle Salon APlan this room →1,770 sq ft164 m²13 ft4 m120150901504450
2 configurations with LaSalle Salon A
Combined and divided set-ups that include LaSalle Salon A
ConfigurationSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
LaSalle Salon ABPlan this room →3,540 sq ft329 m²13 ft4 m24030018030088100
LaSalle Salon BCPlan this room →3,658 sq ft340 m²13 ft4 m24030018032588100
LaSalle Salon BPlan this room →1,770 sq ft164 m²13 ft4 m120150901504450
LaSalle Salon CPlan this room →1,888 sq ft175 m²13 ft4 m120150901754450
MadisonPlan this room →1,450 sq ft135 m²13 ft4 m100140801504450
Michigan APlan this room →1,764 sq ft164 m²12 ft3.7 m100150801253050
1 configuration with Michigan A
Combined and divided set-ups that include Michigan A
ConfigurationSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Michigan BallroomPlan this room →3,654 sq ft339 m²12 ft3.7 m2003001602504066
Michigan BPlan this room →1,890 sq ft176 m²12 ft3.7 m100150801253050
O'Hare 1Plan this room →774 sq ft72 m²12 ft3.7 m506042553030
O'Hare 2Plan this room →774 sq ft72 m²12 ft3.7 m506042553030
Renewal APlan this room →1,369 sq ft127 m²8 ft2.4 m90115751203027
Renewal BPlan this room →364 sq ft34 m²8 ft2.4 m3042244018—
Rosemont 1Plan this room →774 sq ft72 m²10 ft3 m506042553030
Rosemont 2Plan this room →774 sq ft72 m²8 ft2.4 m506042553030
Rosemont 3Plan this room →774 sq ft72 m²8 ft2.4 m506042553030
Rosemont 4Plan this room →774 sq ft72 m²10 ft3 m506042553030
SchillerPlan this room →756 sq ft70 m²10 ft3 m506048602220
SenecaPlan this room →300 sq ft28 m²10 ft3 m1015101510—
SheffieldPlan this room →615 sq ft57 m²8 ft2.4 m2030302020—
ShermanPlan this room →300 sq ft28 m²10 ft3 m1015101510—
StatePlan this room →756 sq ft70 m²10 ft3 m506048602220
StreeterPlan this room →756 sq ft70 m²10 ft3 m506048602220
WabashPlan this room →448 sq ft42 m²10 ft3 m3030212518—
WashingtonPlan this room →448 sq ft42 m²10 ft3 m3030212518—
Waveland APlan this room →364 sq ft34 m²8 ft2.4 m2030242018—
1 configuration with Waveland A
Combined and divided set-ups that include Waveland A
ConfigurationSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Waveland A / BPlan this room →728 sq ft68 m²8 ft2.4 m4024244020—
Waveland BPlan this room →364 sq ft34 m²8 ft2.4 m2030242018—
WellsPlan this room →448 sq ft42 m²10 ft3 m3030212518—

Figures from published venue data; blank cells mean the venue hasn’t published that number. Verify final counts with the venue.

Sizing another room? Try the event room capacity calculator or the floor plan scale converter.

Frequently asked questions

What is the floor plan of The Westin O'Hare?

The Westin O'Hare has 48 rooms. The largest space is Grand Ballroom, 12,069 sq ft (81 × 149 ft). Every room's dimensions and seating capacity by setup are listed on this page. The Westin O'Hare's own floor plans are published on its website, linked from this page.

How many event rooms does The Westin O'Hare have?

The Westin O'Hare has 48 rooms. 56 configurations are listed on this page.

What is the largest space at The Westin O'Hare?

Grand Ballroom, 12,069 sq ft: 81 × 149 ft, 910 banquet / 1,100 theater.

How many people can The Westin O'Hare seat for a banquet?

Up to 910 in Grand Ballroom. The next largest room, Grand Ballroom Salon AB, seats 630.

What is the ceiling height at The Westin O'Hare?

The highest ceiling is 23 ft, in Grand Ballroom.

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