Just two days before thousands of runners and their supporters descended on Chicago for the marathon, hundreds of hotel workers walked off the job at six downtown properties — and union leaders say that could be only the beginning.

The strike was called by Unite Here Local 1, the hospitality workers' union, and it targets six prominent hotels: the Sheraton Grand Chicago Riverwalk, the Westin Chicago River North, the Westin Michigan Avenue, and — per the source — a Marriott-branded and Hilton-branded hotel plus a Millennium property. Three companies are involved, with Marriott and Hilton flags making up the bulk of the list.

Here's the part travellers should watch closely: this walkout is small compared with what union members have authorised. Last month, more than 7,000 workers at 46 Chicago hotels voted to approve strike action. Contracts expired at 44 of those hotels on August 31, with the remaining two also operating without current agreements. Most staff are still working — for now.

Local 1 President Karen Kent wouldn't spell out what would spark a broader walkout, telling Skift the union will have to do "a lot more, whether it's strikes or other actions." Her warning to travellers with bookings: workers at any of the remaining hotels "could be on strike at any moment."

Why does timing matter? The Chicago Marathon is one of the city's biggest hotel nights of the year, packing downtown properties and pushing rates sky-high. A strike over marathon weekend creates maximum pressure on the big chains — and maximum disruption for guests. Striking at unionised hotels often means reduced housekeeping, limited food and beverage service, and picket lines at entrances. Some unions ask guests not to cross; honouring a picket line is a personal call, but it's worth knowing where you're booked.

If you have an upcoming stay in Chicago — whether for a race, a conference, or a city break — it's worth checking which brand you've booked and whether it's affected. The struck hotels are all downtown, in the Riverwalk and Michigan Avenue areas that most visitors gravitate toward anyway, so simply switching to a different property in the same neighbourhood is usually easy. If you're booked at one of the affected Marriott or Hilton hotels and holding a prepaid rate, contact the hotel or the chain directly about options; chains typically reaccommodate guests when operations are disrupted. Credit card and loyalty points bookings are generally easier to cancel or move.

The bigger picture: this dispute covers dozens of hotels across Chicago, not just six. Even if a citywide strike doesn't materialise, the threat alone means service levels at many union hotels could be unpredictable in the coming weeks as negotiations continue. Business travellers and anyone booking Chicago accommodation this autumn should factor that in — book flexible rates where possible, and double-check the latest status in the days before you arrive. Marathon weekend may be the flashpoint, but the standoff between Local 1 and the major chains looks set to run considerably longer than 26.2 miles.

Story via Skift.