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A Trump Rule Change Could Make It Harder to Find the Cheapest Airfare - What Travelers Need to Know

A proposed DOT change could make low base fares more prominent again.

By Ruth Jackson-Kirby , Edited by Calista Headrick

Updated Sept. 18, 2026

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Cheap airfare is only a bargain if the price you see is close to what you actually pay. That idea has shaped airline shopping for more than a decade, but a new Trump administration proposal could change how prominently airlines display base fares, taxes, and mandatory charges. The proposal is not final, yet it could make comparing fares less obvious. Here's what travelers need to know, especially those looking to start traveling more.

Editor's note: Airfare rules and ticket prices could change. Regulatory details in this article reflect the DOT proposal and related filings available as of August 2026.

The 2011 full-fare rule requires airlines to show the all-in price first

The full-fare advertising rule requires U.S. and foreign airlines and ticket agents to display the entire price consumers must pay, including mandatory taxes and fees, when an airfare is first presented. Individual components can't appear more prominently than the total.

The rule took effect in 2012 after the Department of Transportation (DOT) moved to curb advertising that highlighted low fares without making the final cost clear to travelers.

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The Trump DOT wants to give base fares equal billing

The Trump administration's DOT proposed changing how airlines present fare components on July 1, 2026. The proposal would allow base fares, taxes, and fees to appear with the same visual prominence as the total price.

DOT says the change would give airlines "greater flexibility" while keeping fare information clear. The agency is also asking for comments on repealing the full-fare rule entirely.

Critics warn that prominent base fares could confuse shoppers

The concern centers on what travelers notice first. Sean Cudahy, an aviation analyst at The Points Guy, said the proposal "has the potential to make things more confusing for customers."

A prominently displayed $79 base fare could draw attention away from a $147 total price, particularly when travelers compare several airlines at once. The result could be more anchoring on the cheaper number before the actual cost becomes clear.

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Spirit's $9 fares show why the old system raised concerns

Spirit Airlines offered a warning before the current rules took effect. In 2011, the carrier promoted $9 each-way fares through billboards and Twitter. Additional taxes and fees were not clearly disclosed alongside the advertised fare, and some offers required a round-trip purchase.

DOT fined Spirit $50,000, citing violations of its airfare advertising requirements. The full-fare rule followed soon afterward.

A low base fare could make comparing airlines harder

A $99 base fare and a $99 all-in fare may look identical at first glance, but they are not comparable if mandatory charges sit outside the advertised number. Travelers could end up evaluating airlines based on different pricing components rather than the actual cost of the trip.

That becomes particularly important for international itineraries, where taxes and government charges might vary significantly between destinations and airports.

Southwest now says changing the rule could be disruptive

Southwest once opposed the full-fare advertising requirement, but its position has changed after 14 years of consumers shopping under the current system.

In a July 2026 filing, Southwest said repealing the rule now would be "extremely disruptive" and pointed to established consumer expectations around seeing tax-inclusive fares upfront. The airline also requested additional time to study the proposed changes.

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The proposal is still being debated, not implemented

As of August 25, 2026, the proposal has not yet been implemented. The DOT extended the public comment period from July 31 to August 21, 2026, after requests from groups including Airlines for America, Southwest Airlines, and Travel Tech.

The agency must now review the feedback before deciding whether to finalize the rule, revise it, or drop the proposal. For travelers, the current full-fare requirements remain in effect.

Google Flights can help you compare prices across dates

Google Flights remains useful for finding lower fares when your schedule has some flexibility. Its calendar, date grid, and price graph let you compare different travel dates, while its Cheapest tab surfaces lower-priced itineraries that may involve trade-offs.

Price tracking could also send alerts when fares change. Those tools work best when you compare the actual itinerary and total price, not simply the lowest headline number.

Check baggage costs separately before calling a fare cheap

Mandatory taxes aren't the only expense that may change the value of an airfare. Checked bags, carry-ons, seat selection, and other optional services could push the final cost higher depending on the airline and fare.

Google Flights allows travelers to filter prices by bag fees, while DOT requires airlines to disclose applicable baggage fees and allowances. Check those costs before deciding which ticket is genuinely cheaper.

Set fare alerts before you feel pressured to book

Price tracking can take some of the guesswork out of timing a flight. Fare alert tools from Skyscanner, Hopper, and Kayak notify you when prices drop to a target level. They might also flag situations where a fare may increase.

Setting an alert early gives you a reference point, so a low-looking fare doesn't automatically feel like an opportunity you have to grab immediately.

Always compare the price you will actually pay

The safest habit remains remarkably simple. Search for the flight, note the total price, then check what baggage and other required trip costs will add. If two airlines show different pricing formats, calculate the comparable total before choosing.

A lower number on the first screen isn't necessarily a lower airfare. The proposed rule makes that distinction more important, not less, for careful shoppers.

Bottom line

While the DOT proposal could make airfare advertising more flexible, it might make comparing fares harder if base prices receive equal prominence. The full-fare requirement remains in place for now, so focus on what you're actually paying, including mandatory charges and baggage costs.

To save money on travel, compare flexible dates, set fare alerts, and check prices across airlines before booking. A low headline fare isn't always the cheapest ticket.

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