Basic Economy fare will save you money, but there are restrictions with this bare-bones service. American, Delta, Hawaiian, JetBlue, and United Airlines are offering a Basic Economy fare on select routes in an effort to compete with low-cost carriers such as Spirit, Frontier, and Allegiant. Alaska Airlines has a similar Saver Fare.

For travelers who want the lowest fare available and are willing to accept the limitations, a Basic Economy fare is an option.

Seven Restrictions to be Aware of:

1. Tickets Cannot Be Changed:

With most nonrefundable tickets, you can make a change for an added fee. This is not the case with the Basic Economy fare. No changes or refunds are allowed.

If you have to change your flight schedule because of an emergency or other personal reasons, you will forfeit the money paid for the ticket and will be required to purchase a new one.

If the airline cancels the flight, you will automatically be rebooked on the next available flight at no additional cost.

With Basic Economy fare, you cannot fly standby, and same-day flight changes are not allowed.

The 24-hour cancellation period (implemented by the Department of Transportation) includes the Basic Economy fare. You can cancel or change your flight within 24 hours of booking it. Check with the airline before confirming your reservation to see if there are any additional stipulations.

2. Restrictions on Seat Assignments:

Seats will be assigned at check-in or at the gate unless you want to pay a fee for this option. However, there are restrictions. You will not be able to request an upgraded seat or change your seat once assigned, and seating may be restricted to the back of the plane.

There are no guarantees that your family or travel companions will be able to sit together. If traveling with children under the age of 13, this could present a problem. The airlines will try to keep parents and young children together, but that may not always be possible.

If you pay the additional fee, you can request a seat assignment before check-in.

With Delta, your seat will be assigned after you check in for your flight. You cannot pay a fee and choose your seat in advance.

In comparison, Spirit, Allegiant, and Frontier all charge for an advanced seat selection.

3. Carry-on Bag Restrictions:

United Airlines and JetBlue:

United and JetBlue limit you to one personal item you can bring on board. It must be small enough to fit under your seat, like a purse, small backpack, or laptop case.

Full-sized carry-on bags are not allowed, and you cannot use the overhead bins.

If you show up at the gate with a full-sized carry-on bag, you will be required to check it as baggage at the gate and pay the standard checked baggage fee plus a $25 gate handling charge.

United will allow their elite members to bring a full-sized carry-on bag and store it in the overhead bins.

American, Delta, Hawaiian, and Alaska Airlines:

American, Delta, Hawaiian, and Alaska have a more lenient policy. They will allow Basic Economy passengers to bring aboard a personal item and a full-sized carry-on bag and use the overhead bins. Delta will gate-check your carry-on for free if there is no space in the overhead bins by the time you board.

International flights:

For international flights, the airlines that offer Basic Economy fares are less restrictive regarding carry-ons.

Spirit, Allegiant, and Frontier Airlines:

Spirit, Allegiant, and Frontier allow one personal carry-on for free (purse, laptop bag, etc.) if it will fit under the seat. There is an additional charge for full-sized carry-on bags that are stored in the overhead bins.

4. Checked Baggage:

The checked baggage fee is the same as the Economy fare for United, Delta, Alaska, Hawaiian, JetBlue, and American. Spirit, Allegiant, and Frontier charge for checked baggage as well. This fee is for one-way only. Double it for a round-trip ticket.

5. Getting Bumped from the Flight

Airlines typically sell more seats than what are available in anticipation of a certain percentage of passengers not showing up. If they need to bump passengers off the flight, they usually choose passengers who paid the least amount for their seats.

If you are flying on a Basic Economy fare, you increase your chances of getting bumped if the need should arise.

6. Boarding the Plane:

Basic Economy fare passengers will be the last group to board.

Passengers with disabilities or those requiring special assistance can still pre-board. Elite members will maintain their early boarding privileges.

On Frontier, you can board early if you paid for a carry-on bag. Allegiant and Spirit do not offer that service.

7. Privileges of Elite Members may Be Reduced:

If you are an elite member of the airline, you may not be eligible for many of the benefits that are available to members. However, you will continue to earn award miles. These may be at a reduced rate, and other restrictions may apply.

Frontier, Spirit, and Allegiant offer reward miles to their elite members as well.

What will stay the same?

In-Flight Services:

With Basic Economy fare, you will still enjoy the same in-flight services and amenities available with standard Economy service. This includes snacks, non-alcoholic drinks, Wi-Fi (you may have to purchase it), in-flight entertainment, and any meals that are included on long flights.

On Spirit, Allegiant, and Frontier, you can purchase drinks and snacks. Frontier and Spirit charge for inflight Wi-Fi, but Allegiant does not currently offer Wi-Fi service.

You can make an informed decision by understanding the restrictions and added fees that come with the Basic Economy fare. If there is a possibility that you will have to change your flight plans, avoid going with the Basic Economy fare. You will end up paying more in the long run.