You must checkin no later than 45minutes before your flight. It's a TSA requirement so they can confirm the manifest
this post was submitted on 19 Aug 2023
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I'm guessing that's a USA-only rule.
The TSA doesn't have much authority over other countries
Itβs all there in the name: the Transportation States of America
This is the only real rule. Some airlines will have incentives for checking in early.
EDIT: a little bit of research seems to show varying times down to as low as 30 min, and up to about 90 for international travel.
I believe ICAO (that would be the regulating authority) says be at the gate minimum 20 before departure. Considering security queues, though, my advice is to check in online the night before and be at the airport at least 2 hours before departure for a large airport. Small ones you might be able to get away with less, but unless you go through regular and know the setup, I would not chance it. Your airline will give you instructions.
Check in counters normally close for bag drop 1h to 45min before departure here in Europe in my experience. Vast majority of airports also now support digital boarding passes in Europe. My home airport is small so I can work with 1 hr before departure; Brussels was 20min queue at security; Frankfurt we were there 2h30 before departure but at the gate for less.than 10 minutes, queues were that long and slow-moving.
YMMV, check instructions.
Source: I fly lots, mostly in Europe.
Are you sure about ICAO? Feels more like an IATA kind of thing to me β¦?
TSA knows who you are way ahead of time when you put your secure flight information in, and maybe it checks the information when your boarding pass is printed. Airlines close check-in so they don't have unexpected people showing up during boarding. But if you get rebooked on a different flight or something, they can check you in at the gate whenever.
Also, United and Delta let you check in 30 minutes prior to departure if you don't have bags.
Why would the TSA care about when I check in?
This is heavily dependent on your region, country, and airline. Some commenters immediately answer like you were in the US but those might not be valid for you.
When I travel by plane, I download the respective airline Mobile app to get the digital boarding pass.
It'll remind me to check in the day before. I can only assume what would happen if I don't (my would seat given to a standby passenger or something).
Bingo bango, just do it when they ping you. You don't have to, but I don't want to give any airlines any hope that there might be a seat available. Overbooking is stupid but they bank on people missing their flights, I don't want them to think my seat is one of the ones available
I donβt think itβs ever been required but it affects where your seat assignment is I believe.
Everything Iβve gone to buy tickets it lets me choose my seat. How would they give that seat away and move me to a different seat.
Some airlines don't have seat assignment until you print your boarding pass
In the states Southwest Airlines doesnβt assign seats at all, youβre assigned a place in the boarding line and pick any seat. There are upgrades to get in sooner, but for normal folks the order you check in is your place in line, so it is worth checking in 24 hours early (the earliest possible).
It's use is limited for some situations. Especially when you don't only have carry-on, some places still require you to stand in line for checkin. Then you barely have a benefit doing an online checkin.
However, more modern airports/airlines have automated the checkin process, even offer tags to print at home and automated bag drop areas.
For these situations it's pretty good to check in online and just walk past the lines.
I dunno how required it is, but I still make sure to do it.
Also I love it when I check in on my computer and it tells me I've successfully checked in, but then at the airport when I try to pull up my boarding pass on the app it acts like I haven't checked in and makes me do it again.
It's a good idea to avoid being bumped out of a flight because they ended up overbooked
When I fly Southwest, you're supposed to check in starting 24 hours before to get a decent position in line. You can pay extra to get a guaranteed spot in boarding group A, but as long as you check in on the dot you'll get at least B. Wait till the last minute and you'll be stuck in a middle seat in the rear on most flights. Not sure how it works with other airlines, though.