Planning a flight itinerary, step by step

Planning a flight itinerary is mostly about order. Decide the things that are hard to change first (where and when), then the details that depend on them (airports, connections, times), then the paperwork, and only then book. Each step below includes the check that catches the mistake people most often make at that point.

You can lay out the whole trip as you go in the multi-city trip planner, or the flight itinerary builder for a one-way or return trip. Both produce a planning sample, not a booking.

1. Fix the route and the dates you can’t move

Start with the fixed points: the date you must arrive by, the date you must be back, and every place you need to be. Write them down before looking at flights.

Check: count nights at each stop. It’s easy to plan “a week in Rome” and find the flights leave you five nights.

2. Choose the trip shape

• One-way: one direction only. Check whether your destination expects proof of onward travel.
• Return: out and back between the same two cities.
• Multi-city or open-jaw: arrive in one city, leave from another. Often avoids backtracking.

Check: if you need a visa, the shape affects which country you apply to and what you show. Schengen visas are an example; see our Schengen visa guide.

3. Pick airports, not just cities

Many cities have more than one airport, and they can be far apart. Decide which you’ll use at each end, and look up any unfamiliar code in the airport code finder. Our guide to airport codes explains city codes like LON, which cover several airports.

Check: if you arrive at one airport and leave from another in the same city, budget the transfer time and cost.

4. Check connections

A connection is only as good as the time you have to make it.

• Minimum connection times are published for each airport, and can differ by airline and by type of connection. Booking systems won’t normally sell a single ticket with a connection shorter than the minimum.
• Separate tickets get no such protection. If you book two flights separately, you aren’t treated as a connecting passenger: at an airport like Heathrow, that can mean passing immigration, collecting bags and checking in again. If the first flight is late, the second airline doesn’t have to wait.
• Terminal changes and overnight gaps need extra time, and sometimes a hotel.

Check: for any connection on separate tickets, leave a generous buffer, and know what happens if you miss it.

5. Read every time as local

Departure and arrival times are local to each airport, and clocks may change between booking and travel. Look for +1 on arrivals and plan hotels and transfers around the arrival date. Our guide to flight times across time zones explains the arithmetic, and the time zone planner does it for you.

Check: overnight flights. A late-evening departure often means arriving the next morning, tired, on a different date from the one you had in mind.

6. Check documents for every country you touch

This includes countries where you only change planes. Rules vary by nationality and route:

• Entry visas for each country you’ll enter.
• Transit visas: some countries require them even for a connection, depending on your nationality and whether you pass through border control. The UK, for example, ties the type of transit visa to whether you go through border control; your airline can tell you which applies.
• Passport validity for the whole trip.
• Onward travel: some destinations ask for it. See proof of onward travel.

Check: the official government source for each country, not a forum post.

7. Write it down as one itinerary

Before booking, put the whole plan in one place: flights (with airports and local times), nights at each stop, ground transfers and documents. Our guide to reading a flight itinerary shows what a clear one includes.

Check: dates, airports and names agree everywhere, especially if the itinerary supports a visa application.

8. Then book, and check again

Book the flights in the order you planned. When the confirmation arrives, compare it line by line with your plan: names, dates, airports, times and connection lengths. Small differences are much cheaper to fix in the first hours after booking. In the US, for bookings made a week or more ahead, airlines must either hold the fare for 24 hours or let you cancel within 24 hours without penalty.

Questions people ask

How far ahead should I plan an international trip?

Long enough to get any visa you need before booking flights you can’t change. Visa processing times vary widely, so check them first.

Should I book connections on one ticket?

Where you can, yes: one ticket usually means the airline is responsible for getting you to the final destination if a connection is missed. Separate tickets can be cheaper but put the risk on you.

Can I plan without committing to flights?

Yes. Lay out the route and dates with a planning tool, check them against the steps above, and book when you’re sure. A planning sample is marked SAMPLE · NOT VALID FOR TRAVEL and can’t stand in for a reservation.