The night before a trip, do four checks: documents and cards in the bag you'll carry, phone and chargers, tomorrow's times worked backward into an alarm and a ride, and the house. That's about fifteen minutes. Then stop packing, because the list only works if you finish it.
This is written for U.S. travelers flying from a U.S. airport, and it can't know your airline's rules. Where a limit belongs to the airline, like when online check-in opens or how early to arrive, the line says to check its page.

Example: working backward from a 09:10 flight
An illustration, not a rule. It assumes the airline suggests arriving two hours ahead and the ride takes 45 minutes. Yours will differ, so do this sum with your own numbers.
05:30
- What
- Alarm. Nothing left to pack.
- Where the number came from
- Leave time minus 50 minutes to get out the door
06:20
- What
- Leave for the airport.
- Where the number came from
- Arrive time minus a 45 minute ride
07:10
- What
- At the airport.
- Where the number came from
- Departure minus the two hours the airline suggests
09:10
- What
- Flight leaves.
- Where the number came from
- From the booking
| Time | What | Where the number came from |
|---|---|---|
| 05:30 | Alarm. Nothing left to pack. | Leave time minus 50 minutes to get out the door |
| 06:20 | Leave for the airport. | Arrive time minus a 45 minute ride |
| 07:10 | At the airport. | Departure minus the two hours the airline suggests |
| 09:10 | Flight leaves. | From the booking |
In the bag you carry
Carry the things you can't replace at a counter. Don't put them in a checked bag.
7 things to do
Ticks are for this visit only. Nothing here is saved anywhere.
Times and rides
- Check the flight or train time once more on the airline or operator's own app or page. Times move overnight sometimes, and you want to hear it tonight, not at the curb.
- Work backward from departure the way the table does, and set the alarm for the earliest time you need, not the time you'd like.
- Book or confirm the ride, or decide where you'll park. Write the leave time on your paper page.
- If any hotel, rental car or transfer on the first two days depends on the flight, glance at its time. If a flight changed, what else it affects shows how to check the chain.
The house
Small jobs, five minutes.
5 things to do
Ticks are for this visit only. Nothing here is saved anywhere.
What to skip tonight
Skip re-packing the whole bag. If the bag is done, a packing list already did that job, and opening it now only creates a new gap. Skip deep cleaning and skip re-planning the trip. Anything you think of after the list is done goes on one sticky note by the door.
When it goes wrong tonight
The passport isn't where you left it. Check the last place you used it and the pockets of the bag you carried last, then look at what to do when a passport, wallet or phone goes missing. The airline moved your flight. Read the new time against everything that hangs on it, and if you have a connection, what to do first when a flight is delayed covers the first twenty minutes.
Where Travel Companion fits
Today in Travel Companion shows what's happening today, what is worth knowing about tomorrow, such as a hotel check-in window or a rental pickup, the bookings for the day after, and anything you're still waiting to hear back on. It looks two days ahead, no further, and it sends no alerts. The Preparation list holds to-dos in seven kinds (Documents, Packing, Transport, Money, Home, People, Bookings) that you tick off, and the packing list can be saved as a PDF. It holds one trip at a time, the one you're about to take. See the Travel Companion page.
Questions people ask
What should I do the night before a flight?
Check that your ID and cards are in the bag you carry, charge your phone, confirm the flight time and your ride, work backward into an alarm, and do the house jobs. If your airline's online check-in is open, do it. Then stop packing and go to bed.
When can I check in for a flight online?
It depends on the airline. Many open online check-in about a day ahead, but the window differs, so read your airline's page or app instead of trusting a rule of thumb. If it's open the night before, doing it then leaves the morning free.
What ID do I need for a domestic flight?
Adults need acceptable ID at the TSA checkpoint. Since May 7, 2025, that means a REAL ID-compliant license or another accepted document such as a U.S. passport. Children under 18 don't need ID for TSA on domestic flights, though an airline may set its own rule, so check yours.
Can I bring medication and a power bank in my carry-on?
Yes to both, and carry-on is where they belong. TSA allows medication in amounts over the 3.4 ounce liquid limit, and says devices with lithium batteries should be carried in carry-on baggage. Keep medication in its original packaging. Check your airline for any limits on power banks.
How early should I leave for the airport?
Work backward from your flight. Start with how early your airline suggests arriving, subtract the ride time, and add a buffer for traffic or parking. There's no single number that fits every airport, so use the airline's page and give a bigger airport a bigger cushion.
Sources and how we checked
- TSA: Identification: Adult ID, REAL ID enforcement from May 7, 2025, no ID for under 18.Checked 26 September 2026.
- TSA: Liquids, Aerosols and Gels Rule: 3.4 ounce limit and the medication exception.Checked 26 September 2026.
- TSA: What Can I Bring: Lithium battery devices belong in carry-on baggage.Checked 26 September 2026.
- CBP: Know Before You Go, Traveling Abroad: Carry, do not pack, travel documents; carry prescription medication in original packaging.Checked 26 September 2026.
Where to go next
- Travel document checklist: what to carry and where
For a fuller check of what each traveler needs and where it is kept, use this documents guide.
- Carry-on only packing list: how to fit it in one bag
To check the bag itself, this covers packing one carry-on to a list, with size and weight checked on the airline page.
- Flight delayed with a connection: what to do first
If the morning goes wrong at the airport, this covers the first twenty minutes of a delay with a connection.