Most people don't know this exists. US DOT regulation 14 CFR 259.5 requires all airlines to either hold a reservation at the quoted price for 24 hours without payment, or allow free cancellation within 24 hours of purchase — as long as the booking is made at least 7 days before departure.
How to use this as a price-lock strategy
The trick is to use this rule to book now and decide later.
Step 1: Find a flight you like at a good price. Book it. Pay for it.
Step 2: Keep searching. Check Google Flights, Skyscanner, the airline direct. Check the same flight the next morning when sale prices sometimes update.
Step 3: If you find a better price within 24 hours, cancel the first booking (free) and rebook at the lower price.
Step 4: If you don't find better — you already have the ticket.
The practical version
I use this every time I book a flight more than a week out. I book the best price I find, then spend 30 minutes the next morning checking if prices dropped overnight. About 30% of the time I find something better.
Which airlines honor this
All US airlines by law. For international airlines operating to/from the US, they also must comply. That covers most major carriers.
Airlines that are easy about it: United, Delta, American, Southwest, JetBlue, Alaska.
Watch out for: Budget carriers like Spirit and Frontier sometimes make cancellation harder than it should be — read the cancellation flow carefully.
The 7-day rule
This only applies to bookings made at least 7 days before departure. Last-minute bookings don't qualify. Plan accordingly.
What about Priceline specifically
Priceline is my preferred OTA for this because their cancellation flow is fast and the refund usually hits within 3–5 business days. Expedia works too. Booking direct with the airline is the most reliable.
Stack it with price alerts
Set a Google Flights price alert for the route before you book. If the alert emails you a drop within your 24-hour window, you know to cancel and rebook. I've saved $60–$180 doing this.
The one thing to check
Some fares are marked "non-refundable" even on Priceline. For those, the 24-hour rule still applies — US law overrides the fare rules for the first 24 hours. But after 24 hours, those fares are genuinely non-refundable. Don't miss the window.
Written by Avi
Full-time traveler and travel hacker who has explored 50+ countries. Real experience, not theory — every guide comes from time actually spent in the place.
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