Cheap Flights in the US: A Complete Price Guide for Belgian Travelers
Hunting for cheap flights in the US feels different from booking within Europe. American carriers charge for bags, seat selection, and even carry-ons on some budget airlines, so the sticker price rarely tells the full story. If you are planning a multi-city trip across the United States from Brussels or Antwerp, understanding how domestic airfare works can save you hundreds of euros before you even leave home. This guide breaks down real prices, the best booking windows, and the airlines worth your money.
How Much Do Domestic US Flights Actually Cost?
Domestic fares in the US swing wildly depending on route, season, and how far ahead you book. On competitive corridors like Los Angeles to Las Vegas or Orlando to Atlanta, basic economy fares start around $39 to $59 one-way (roughly €36 to €55). Longer transcontinental routes, such as New York to Los Angeles, typically run $120 to $300 one-way when booked sensibly.
Here is a realistic picture of typical one-way fares on popular routes:
| Route | Budget carrier | Legacy airline | Typical price range |
|---|---|---|---|
| Los Angeles – Las Vegas | Spirit, Frontier | Delta, American | $39 – $120 |
| New York – Miami | JetBlue, Spirit | American | $59 – $180 |
| New York – Los Angeles | JetBlue | Delta, United | $120 – $300 |
| Chicago – Denver | Frontier | United, Southwest | $49 – $150 |
| San Francisco – Seattle | Alaska (sale fares) | Delta, United | $59 – $160 |
Compare that with Europe, where a Brussels to R
ome hop can cost €20 on Ryanair. American budget fares look higher on paper, but distances are often three to five times longer. Per kilometre, cheap flights in the US frequently beat European pricing on long sectors.
Which Budget Airlines Operate in the US?
Five low-cost carriers dominate the American market, and each has its own quirks that affect your final bill.
- Spirit Airlines: The ultralow-cost leader. Fares can drop to $28 one-way, but carry-on bags cost $35 to $65 each way if you pay at the gate instead of online.
- Frontier Airlines: Similar model to Spirit, strong in Denver and Orlando. Watch for their occasional penny-fare sales, though add-ons pile up quickly.
- Southwest Airlines: Two free checked bags on every fare and no change fees, which makes them cheaper than they first appear on longer trips.
- JetBlue: A hybrid carrier with more legroom and free Wi-Fi. Excellent for transcontinental routes when legacy prices spike.
- Allegiant Air: Serves smaller cities like Asheville and Fresno, often the only low-fare option in those markets.
A Spirit fare of $45 becomes $140 fast once you add a cabin bag and choose a seat. Always compare the total price with bags included, not the headline fare.
When Should You Book to Get the Best Price?
Domestic US airfare follows predictable patterns. Data from airfare studies consistently shows that booking 28 to 60 days before departure produces the lowest average fares. Book earlier than four months out and you often pay a premium, because airlines have not yet started discounting to fill seats.
Timing within the week matters less than it used to, but fares still dip on Tuesdays and Wednesdays, when airlines match competitors’ sales. Departure day matters more. Flying Tuesday, Wednesday, or Saturday routinely saves $30 to $70 per segment compared with Friday or Sunday travel.
For Belgians visiting in summer (July and August align with European school holidays), expect US fares to peak. Aim for May, late September, or October instead, when domestic prices drop 20 to 40 percent and national parks are quieter.
What About Last-Minute Deals?
Forget the myth of cheap last-minute domestic fares in the US. Unlike European carriers that dump unsold seats, American airlines raise prices sharply inside 14 days of departure, targeting business travellers. If you must fly last minute, check Southwest directly, since their fares never appear on Google Flights or most aggregators.
How Do You Search Effectively from Belgium?
Google Flights remains the strongest starting point for domestic US routes thanks to its calendar view and price tracking. But several important carriers are missing from it. Southwest sells only through its own website, and Allegiant appears on few third-party platforms. Check those two separately or you will miss genuine bargains.
A practical approach from Belgium: book your transatlantic leg as a multi-city itinerary (for example, Brussels to New York, return from Los Angeles) and then fill in domestic hops separately. Since US domestic one-way pricing carries no round-trip penalty, you can piece together an open-jaw American road-trip-by-air without fare penalties.
Pay in dollars when booking US carriers if your Belgian card avoids foreign transaction fees. Cards like Revolut or KBC’s travel-friendly options keep conversion costs near zero, while paying in euros through an airline’s converted price often adds a 3 to 4 percent markup.
What Hidden Fees Should Belgians Watch For?
American airline pricing hides costs that European travellers rarely expect. Knowing these before you click pay makes the difference between a bargain and a budget buster.
- Bag fees: Spirit and Frontier charge $35 to $65 per carry-on bag per direction. Delta, United, and American include a carry-on but charge $30 to $35 for the first checked bag.
- Seat selection: Basic economy fares on legacy carriers do not include seat choice, and families may be split up unless they pay $15 to $45 per seat.
- Boarding groups: Cheaper boarding positions on some carriers cost extra and affect overhead bin access.
- Change and cancellation: Most standard US fares are now flexible, but basic economy is usually non-refundable and non-changeable.
One more difference from Europe: there is no EU261-style compensation for delays on domestic US flights. If a cancellation strands you, the airline’s only obligation is rebooking. Travel insurance bought in Belgium before departure is your real safety net here.
Is It Cheaper to Fly or Take the Train or Bus?
For distances under 300 km, nothing beats a bus. FlixBus and Greyhound sell northeast corridor hops like New York to Philadelphia for $10 to $20. Amtrak’s Northeast Regional train connects New York to Washington in under three hours for $30 to $90, which beats airport hassle entirely.
Beyond that, flying wins almost everywhere. There is no American equivalent of the high-speed rail linking Brussels to Paris. A train from Chicago to Los Angeles takes 43 hours and costs $150 to $300, while a flight covers it in four hours for a similar price. For cross-country itineraries, cheap flights in the US are not just faster, they are usually the only rational option.
FAQ: Cheap Flights in the US
Can I book US domestic flights from Belgium before my trip?
Yes, and you should. US carriers accept foreign billing addresses and European cards without issue. Booking before departure locks in lower fares and lets you plan baggage costs in advance.
Do I need a passport for domestic flights inside the US?
Foreign visitors must show a passport for domestic flights, since the REAL ID system does not apply to international travellers. Keep your passport accessible at every US airport, not locked in checked luggage.
Are budget US airlines safe?
Completely. The FAA regulates all US carriers under the same strict safety standards, whether the ticket cost $28 or $400. Budget airlines cut comfort and baggage allowances, never maintenance.
What is the single cheapest way to cross the US?
Book a JetBlue or Southwest sale fare on a transcontinental route 30 to 60 days out, fly midweek, and pack in a personal item only. Done right, coast-to-coast costs under $100 one-way.
Conclusion
Scoring cheap flights in the US comes down to arithmetic, not luck. Book four to eight weeks ahead, fly midweek, compare total prices with bags included, and remember that Southwest and Allegiant never show up on mainstream search engines. Build your American itinerary as one-way segments, skip the basic economy traps when you have luggage, and let a Belgian travel insurance policy cover what US carriers will not. Do those five things and a multi-city American adventure costs far less than most Belgians expect.
