CDG as a layover airport for Schengen travel on H1B

You are considering booking separate flights for your trip. As David indicates, this means that if you are delayed, you are most likely on the hook to book and pay for a new ticket to Warsaw (and usually the return flight from Warsaw to Paris as well).

Tickets booked at the last minute can be quite a lot more expensive than tickets booked in advance. And if travelling during busy periods, you could have to wait a while to get a seat (or, alternatively, they may be very, very expensive).

Any hotels and meals would be on you as well.

Remember that if you have checked luggage, you need to:

• Deplane. Can take a while on large planes like a 777 or a 380.
• Walk to customs. If you are flying Air France, you’ll most probably end up in the L or M concourse, which means quite a bit of walk, then wait for a people mover, ride that, and a bit more walk. In other terminals it will be quicker but still a bit of a walk.
• Queue for passport control. There are lots of international flights arriving in a short period in the morning, and there can be significant queues. Even the boss of Paris airports complained about it recently. 90 minutes wait is not unusual if you don’t have status.
• Wait for your luggage. Even if by any chance your get through passport control quickly, CDG has awful performance when it comes to that, it’s often worse than a third world country. Don’t trust the estimated time shown on the signs.
• Go through customs, which is usually quick, but you never know.
• Get to the terminal for your departing flight. Could take anywhere from a few minutes to a good half hour (there are officially 3 terminals, but it’s a lot more complex than that, and terminal 3 is quite a distance from the inter-terminal people mover).
• Find your departing flight’s check-in area, queue and..
• Check-in/drop your luggage before the check-in deadline (depends on the airline and flight, but usually close to one hour before departure).

After that you’ll have the usual steps of going through security and to your gate before the boarding deadline, but if you make the earlier deadline that should be a piece of cake.

The general rule of thumb is that if you have two flights on separate tickets, you should have at least 4 hours between them, but it really depends on the combination of flights (dictates which terminals you use, check-in deadlines, cost of rebooking a new flight at the last minute, risk that you may have to stay overnight...). For the return flights for instance I would have a LOT more buffer, as check-in deadline for long haul flights are longer, there aren’t many CDG-SFO flights (you’ll probably have to wait until the next day), and such a flight at the last minute will be very costly.

Ideally, you want to have an overnight stay in between, but that really depends on the combination of flights.

As to why search engines don’t usually suggest those flights:

• I think the reasons above are enough. We have quite a few questions around here from people who book separate flights and end up in dire straits when things go awry.
• In addition to the above issues, in many situations (not here), it adds requirements for full visas for the transit point which would not be needed with an airside connection.
• Some engines actually do, and people have all sorts of issues they didn’t expect when delayed.
• The minimum connection time if everything goes alright is much higher than a “real” connection, so many combinations are just not possible on separate tickets, even if all flights are on time, and if you add enough buffer, that restricts combinations even more. A “real” connection will allow connection times under an hour (some airports and airlines go down to 30 minutes even for international-to-domestic). This is just impossible for tickets booked separately.