I'm assuming that you are checking a bag with United at your point of origin and you are changing United domestic flights in Chicago with one hour between flights. In general, that should be fine.
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If the time between flights is 1–2 hours, your checked baggage will probably make the connection. If there's more than three hours between flights, there's no excuse for your baggage not making it.
As a general rule, you should arrive at the airport no less than an hour before a domestic flight. Ninety minutes to two hours is a safer bet, and most airports, such as London Heathrow and London Gatwick, recommend that you get to the airport two hours before a domestic or European flight.
What is the recommended layover time for international flights? International flights require longer connections as you will often have to go through immigration and customs upon arrival. For international layover flights booked on one airline, two hours is often recommended to make your connection.
When you're traveling outside of the United States, we suggest arriving at least 3 hours prior to your departure. You must be checked in at least 1 hour before your scheduled departure.
Check-in timesYou can check in online or from the app starting 24 hours before and up to 45 minutes before your flight (90 for international). To check bags or check in at the airport, you must be there a certain amount of time before scheduled departure: Within the U.S. – 45 minutes.
First, check-in closes an hour or two before flight departure; if you're not checked in by then, either through the app, online, or in person at the airport, you may not be able to get a boarding pass to get through security and will likely miss your flight.
The earliest you can check your bags vary based on the airline and airport policies. But in general, the earliest time you can check your bags is 2-4 hours before flight time. Some may allow up to 6 hours, but most international flights won't accept check-in earlier than that.
The general rules are: 1-4 hours: short-checking luggage usually isn't permitted during quick layovers in this duration. 4-10 hours: airlines are hesitant to short-check luggage during moderately long layovers unless an acceptable reason is provided. You may or may not able to get your luggage.
If your itinerary was purchased as one ticket (as in: you have only one itinerary and one confirmation number), and the connection time was too short and you miss the second (or third) flight, you can rest easy, no matter what happens. The airline will simply put you onto the next available flight, free of charge.
Beyond ensuring you can get on the plane, Keyes also notes there are other goodies to be had by checking in as early as you can on an airline's website or app. Sometimes airlines allow seat selection after check-in or at least have first pick compared to folks who check-in later, he says.
What happens to the baggage during a stopover? As a rule, you do not have to worry about anything in this case. The luggage will arrive at your destination even in case of unscheduled flight cancellations or rebooking due to a missed connecting flight.
For domestic flights in the United States, most airlines recommend that passengers arrive at the airport at least 1-2 hours before the scheduled departure time for check-in and security screening. How does luggage work with connecting flights?
For international travel, a good rule is to arrive at the airport 3 hours prior to departure and 2 hours for domestic travel. International flights often start boarding 45 minutes to 1 hour prior to departure time.
Most airlines recommend arriving at the airport three hours before departure for international flights. It's common for international flights to start boarding earlier than domestic flights (the aircraft are often larger and have higher passenger capacities), which accounts for the earlier recommendation.
How early should I be at the airport for an international flight? For international flights, the recommendation is to arrive at the airport at least three hours before departure. For flights within the EU, it is recommended to be there at least two hours before.