It’s hard to know for sure when you’ll get the best deal on a plane ticket, even with sites like FareCompare and Farecast, which help out by showing you flight price histories.

But Price Assurance from Orbitz, announced last week, makes booking with confidence much easier. After you book your flight, Price Assurance guarantees that if someone else books the same flight (same date, same time) through Orbitz at a better rate than yours, Orbitz will send you a check for the difference (between $5 and $250 per person).

If you are familiar with Yapta, this is similar however you don’t have to request the savings, Orbitz automatically gives it to you.

This makes a pretty convincing case for booking with Orbitz, even with the nominal fee they tack onto the ticket price.

Here’s the fine print:

Once you book a flight on Orbitz, we start tracking to see if another customer books the same itinerary at a lower price.

If that happens, we’ll issue a refund for the difference, between $5 and $250 per traveler. We’ll continue tracking until the day you fly. So each time the price drops and another customer books, your refund amount will increase.

Expect to receive your refund check approximately 30 days after your trip is complete. We’ll mail it to the billing address for the credit card used to make the booking. You’ll have 90 days from the date the check is issued to cash it.