Why your calendar sync is behind, and what to check first
If you list on more than one platform, your calendars are not synced. They are periodically reconciled, which is a different thing, and the gap between those two words is where double bookings live.
How iCal sync actually works
Each platform gives you a calendar file at a URL. The other platform fetches that file on its own schedule and updates itself. Nobody pushes anything. There is no live connection.
That means a booking on platform A is invisible to platform B until B decides to go and look. How often that happens is not something you control, and platforms describe it in vague terms rather than committing to a number. In practice the window is long enough that a guest can book a date you already sold.
The risk is not spread evenly. It concentrates in two places:
- Same-day and next-day bookings. A last-minute booking has the least time to propagate before someone else books the same night.
- Popular dates. The nights most likely to be booked twice are the ones most likely to be booked at all.
What to check, in order
1. Are both directions connected? This is the one that catches people. You imported A's calendar into B, felt finished, and never did the reverse. Sync is two separate one-way links and you need both. Open each platform's calendar settings and confirm you see the other platform listed as an imported calendar. (see Airbnb: Sync your home host calendar to other websites)
2. Are the URLs still alive? iCal links can go stale — you regenerated one, changed a listing, or the platform rotated it. A dead link usually does not announce itself. It just stops updating, and everything looks fine until it isn't.
3. Is there a buffer? Most platforms let you require a gap between bookings. A one-night buffer does two useful things: it gives the cleaner room, and it absorbs a sync delay that would otherwise become a collision. If you are managing sync by hand, this is the single highest-value setting available to you, and it is free.
4. Do the calendars actually match right now? Not "should they" — do they. Open both, side by side, and compare the next sixty days. Record the comparison date and any differences you actually find.
Checking it without doing it by hand
A manual comparison is a point-in-time check; record how long it takes for your calendars. Choose a review interval you can maintain and record when the check last ran.
What you want is something that reads both calendar files directly and tells you when two bookings overlap. The calendar files are plain text at a URL — anything that can fetch a URL can read them. This is not a hard problem, and it does not require platform API access, which individual hosts do not get anyway. (see RFC 5545, the iCalendar specification)
When it happens anyway
If two accepted bookings conflict, check each reservation and the platform's current change or cancellation rules before deciding what action to take. Record the guest impact and the options available for the specific conflict. Compare the actual cancellation or change conditions with the guest impact; there is no universal cost ranking for all platforms and reservations. (see Airbnb: Cancellation options)
Then write down which platforms were involved and how many hours the booking was live before you saw it. Three of those notes will tell you where your actual gap is.
Questions people ask about this
I already imported Airbnb's calendar into my other platform — is that enough?
No. Each connection is one-way, so importing A into B only tells B about A. You have to go into the other platform's calendar settings and import in the reverse direction too, then confirm each side actually lists the other.
How often does iCal sync actually update?
You don't get to set it — the receiving platform fetches the file whenever it decides to, and platforms describe the timing in vague terms instead of a fixed number. In practice the gap is wide enough for a second guest to book a night you already sold.
When am I most likely to get a double booking?
The risk isn't even across the calendar. Same-day and next-day bookings are worst because there's almost no time for the update to travel, and popular dates are next because they're the ones two people are most likely to grab.
What's the single best free setting to stop double bookings?
Turn on a booking buffer — most platforms let you require a gap between stays. One night of buffer absorbs a sync delay that would otherwise turn into an overlap, and it gives your cleaner breathing room at the same time.
Do I need API access to check my calendars for overlaps automatically?
No. The iCal files sit at a public URL as plain text, so anything that can fetch a URL can read them and flag overlapping bookings. Platform API access isn't available to individual hosts anyway, and you don't need it for this.
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