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I've booked international air tickets from a variety of sources and I've always needed to supply passport details, e.g. airline websites, travel agents. However I've just booked a flight with Expedia and at no point did they ask for my passport details.

Has anyone got some experience with this? Should I be concerned? Do I need to provide them at some point, or just when I show up at the airport to check in?

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I have just had the same thing happen to me. What was the outcome? :) – user32315 Jul 29 '15 at 11:13
Eventually I got access working to the airline's site and entered my details in there. I don't believe I needed to, as I was never prompted for it, but I figured why potentially cause myself future hassle. My airline was Thai Airways BTW. – dlanod Aug 10 '15 at 23:48
up vote 6 down vote accepted

In some airline examples, it's only when you get to check in - either online or in person, that the passport details are requested. Before then you'd receive only a booking reference number, and you may be asked for your name and other identifying details (as you've stated Expedia did).

The booking number is enough to confirm it was your ticket, and at check-in, the passport details will be entered, either by you or the airline staff at the counter.

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Does this vary by route or airline? I know some airlines seem very insistent on getting the details up front. – SpaceDog Apr 28 '14 at 5:44
Often it's by destination country - some countries (notably the US) are very keen to hoover up all your personal details ASAP... – Gagravarr Apr 28 '14 at 7:35
@SpaceDog I couldn't be certain, I've just noticed in the past myself. As Gagravarr points out, some countries are more fanatical about getting your specs. – Mark Mayo Apr 28 '14 at 8:32

It depends where you're coming from and going to, however -- in my experience -- if the airline needs these details then either they will contact you directly, or they will get Expedia to do it. This often happens a little after booking, and sometimes they will wait until nearer your departure date.

If you're concerned the first thing to try is go to the 'Manage my flight' or equivalent on the relevant airlines webpage and try and access your booking via the information Expedia gave (hopefully you have the e-ticket number or booking reference, but often just name and flight are enough). These pages generally make it clear that you need to provide further info, and you can generally do it from that page.

If that doesn't work, and you don't get an e-mail, then contact Expedia support and ask them in the first instance. They should be able to help you.

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I did try the airline page, as that seemed the most logical place, but the booking reference didn't call up any flight. Thanks for the info though. – dlanod Apr 28 '14 at 5:42
How far away is your flight and how long ago did you book? Sometimes it takes a while for the on-line site to catch up with bookings on the backend. – SpaceDog Apr 28 '14 at 5:44
The flight is in June, and we only booked about a fortnight ago. – dlanod Apr 28 '14 at 6:15
Sometimes you can manipulate agency booked flights via the normal online system. But anyway if they need the info someone will contact you, if you're really concerned mail Expedia support (and possibly the airline) and double check. – SpaceDog Apr 28 '14 at 9:07
@dlanod Are you certain you used the right booking reference? You'll have one for Expedia, but you'll have another one for more or less each airline on the itinerary. An airline won't be able to look up a flight based on Expedia's number or another airline's number. In any event, flights booked through third parties like Expedia often omit or get wrong details like seat requests or frequent flyer numbers, so I try to call in and confirm that everything is in order after booking. – choster Apr 28 '14 at 14:52

We have travelled to Thailand for the past 8 years with Thai Airways and have always booked our tickets online; at no time have we ever been asked for passport numbers, just showing these at check-in. Never had any problems whatsoever.

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