In 2026, the decision to fly instead of drive typically hinges on a "500-mile rule" and the number of travelers. If you are a solo traveler going more than 500 miles (800 km), flying is almost always the better option for both time and cost efficiency. For example, a flight from Dallas to Chicago takes roughly 2.5 hours, whereas driving takes over 13 hours and can cost more in gas, tolls, and "wear and tear" than a budget airfare. However, for groups of 3 or more or trips under 300 miles, driving remains the winner in 2026 due to the "hidden" time costs of flying (getting to the airport 2 hours early, security lines, and baggage claim). Furthermore, if your destination requires a rental car, the high 2026 rental rates often make driving your own vehicle more economical. Ultimately, fly when your "door-to-door" travel time by air is less than half the driving time, or when the cost of gas exceeds the total price of all air tickets combined.