Just imagine you finally book flights for a trip you’ve wanted to take for years and later realize you could have saved hundreds of dollars just by booking a little differently.

After travelling for years, I’ve seen the same booking mistakes happen again and again. Most of them seem small at first but they can easily cost extra money or turn a smooth trip into a stressful one.

Here are some of the most common ones.

1. Not noticing long or overnight layovers

Sometimes a flight looks like an amazing deal until you notice the catch a 10-hour overnight layover.

If you didn’t plan for it, you often end up with two choices:

• Pay a lot for a last-minute airport hotel
• Try to sleep somewhere inside the airport

Overnight layovers can actually be nice if you plan them ahead of time. Some airlines even offer free transit hotels in certain cities. But if you didn’t expect it, it can make the trip much more exhausting.

2. Booking the wrong airport

This happens more often than people think. Many big cities have multiple airports. For example:

• New York - JFK, LaGuardia, Newark
• Washington DC area - DCA, IAD, BWI

If you search by city instead of the exact airport, it’s easy to accidentally book the wrong one.

It gets even worse with cities that share the same name. Imagine trying to book Naples, Florida and accidentally selecting Naples, Italy. Believe it or not, people actually do that.

3. Booking flights that require changing airports

Some itineraries require you to switch airports during a layover.

A common example is London, where some routes require transferring between Heathrow and Gatwick.

That means you might need to:

• Leave the airport
• Pay for transportation
• Navigate an unfamiliar city
• Go through security again
• Possibly recheck your luggage

After a long flight, this can quickly turn into a stressful situation.

4. Not checking baggage rules

This happens constantly with budget airlines. Many low-cost carriers only include a small personal item for free. A standard carry-on may cost extra.

At the gate, it’s pretty common to see someone being asked to pay a large fee because their bag doesn’t meet the airline’s size limits.

Always check baggage rules before booking especially with basic economy tickets.

5. Booking two one-way tickets without comparing prices

Sometimes booking two one-way flights can save money. But other times it’s much more expensive.

For example:

Round-trip ticket: $434
Outbound one-way: $441
Return one-way: $950

Booked separately, that trip would cost $1,391. It’s always worth comparing both options before deciding.

6. Ignoring multi-city or open-jaw tickets

Sometimes you can pay the same price as a round-trip flight while flying into one city and leaving from another.

For example:

• Fly into Paris
• Fly home from Rome

These are called open-jaw or multi-city tickets and they often make travel plans much easier.

7. Booking everyone on the same reservation

Airlines sell only a certain number of seats at each price level. If you search for four tickets but only two seats remain at the lowest price, the system may show the higher price for all four passengers.

Sometimes you can save money by booking seats separately.

8. Booking through third-party websites instead of the airline

This one causes a lot of problems. Third-party booking sites can look cheaper but if something goes wrong such as delays, cancellations, schedule changes, customer support can become complicated.

When you book directly with the airline, it’s way more easier to:

• change flights
• request refunds
• contact support

Even if the price is slightly higher, booking directly can save a lot of stress later.

After years of travelling, I’ve realized that most travel problems start during the booking process, not during the trip itself.

Taking a few extra minutes to double-check the details can save a lot of money and frustration later.

What’s the worst flight booking mistake you’ve ever made?