Cheap Flights From Houston: IAH vs Hobby, Bags and Timing

How do you find cheap flights from Houston?

Price Bush Intercontinental (IAH) and Hobby (HOU) together, because they sell different networks. Houston Airports’ route map listed 192 nonstop destinations from IAH, mostly United, and 70 from Hobby, mostly Southwest. Add bags and seats before comparing totals, search a month rather than a date, and discard any saved Spirit fares.

Houston has two busy airports run by one authority, and each airport’s main airline is absent from the other. On 17 October 2026 we read the interactive route map on Houston Airports’ Explore Destinations page: it listed 192 nonstop destinations from IAH, 179 of them served by United, and 70 from Hobby, 66 of them served by Southwest. A search that covers only one airport therefore sees only part of the city’s supply.

Fare history needs a reset too. Spirit Airlines began an orderly wind-down on 2 May 2026 and cancelled all of its flights (FOX 2 Detroit, 2 May 2026), and the route map we checked does not show it at either Houston airport. Price alerts, screenshots and rules of thumb built before May may anchor on fares that no airline now sells.

The rest of this page sets out which airport suits which trip, what the low-cost fares leave out, how far ahead to search and when points help. For tactics that work from any city, our 21 ways to cut airfare and Google Flights handbook go deeper.

Which Houston airport is cheaper, IAH or Hobby?

Neither airport is cheaper by default. IAH combines United’s hub with Frontier, American, Delta, two Mexican low-cost airlines and long-haul foreign carriers, while Hobby is a one-terminal Southwest base with a handful of Allegiant, American, Delta and Sun Country routes. Whichever airport has competing airlines on your route usually sets the price.

Counts in the table come from the route map on Houston Airports’ Explore Destinations page, read on 17 October 2026; a destination served by two airlines is counted under both. The single-route airlines at IAH range from Avelo, which flies to New Haven, to Emirates, Qatar Airways, Turkish Airlines, ANA and Air New Zealand on their own long-haul links. Houston Airports describes IAH as a major United hub and a primary gateway to Latin America (Houston Airports).

Reaching either airport by bus is cheap. METRO’s 500 runs nonstop between downtown and IAH Terminal E for $4.50, leaving every 15 to 30 minutes from outside Door E-201, while the 102 is a $1.25 local route that stops at Terminal C (METRO). At Hobby, every METRO bus uses the Hobby Transit Center just north of the baggage-claim exits, with the same $4.50 express and four $1.25 local routes (METRO).

Inside IAH, the five terminals are linked airside by the Skyway, which Houston Airports says runs every two minutes and takes nine minutes from Terminal A to D/E (Houston Airports). That matters when a cheap itinerary connects between airlines in different terminals.

Which nonstop routes from Houston have the most competition?

Routes with two or more airlines are where Houston fares have room to fall. At IAH the map shows four airlines each to Los Angeles, Mexico City and San Salvador, two each to London, Frankfurt, Amsterdam and Tokyo Narita, and three to Guadalajara and Querétaro. Single-airline routes, including Sydney and Munich, give connecting itineraries more of a chance.

The table pulls the busiest overlaps from the same Houston Airports route map. Domestic trunk routes are where the two airports compete with each other: Los Angeles, Atlanta, Chicago, New York, Denver, Las Vegas and Orlando can all be flown from either airport, on different airlines, so price both before choosing.

Long-haul choice is concentrated at IAH. Besides United’s own flights to London, Frankfurt, Munich, Amsterdam, Tokyo, Sydney and a long list of South American cities from Bogotá and Quito to Santiago and Buenos Aires, the map lists Air France to Paris, ITA Airways to Rome, Turkish Airlines to Istanbul, Emirates to Dubai, Qatar Airways to Doha, EVA Air to Taipei and Air New Zealand to Auckland.

Hobby’s international list is short but useful for beach trips: the map shows Southwest flying to Belize City, Cancún, Liberia, Montego Bay, Puerto Vallarta, Punta Cana, San José in Costa Rica and Los Cabos, and United flies every one of those eight from IAH. Houston Airports adds that HOU passengers move between gates within one main terminal (Houston Airports).

What do low-cost fares from Houston leave out?

Usually the bags. Southwest at Hobby includes a carry-on, but its cheaper fares booked from 9 April 2026 pay $45 for a first checked bag and $55 for a second. Frontier at IAH includes only an under-seat personal item. United Basic Economy allows a full-size carry-on only to South America and across the Atlantic or Pacific.

Southwest’s fee table lists $45 for the first checked bag and $55 for the second on Basic, Choice and Choice Preferred fares booked or changed on or after 9 April 2026, against $35 and $45 before that date. Choice Extra fares and A-List Preferred members get two bags free, A-List members and Rapid Rewards cardmembers get the first one free, and every passenger keeps one carry-on and one personal item (Southwest).

Frontier, which the route map shows on 20 IAH routes, works the other way round: a personal item up to 18 by 14 by 8 inches is included, and a carry-on or checked bag is bought separately or in a bundle. Frontier says bag prices vary with travel dates and timing, and are higher at the airport than when added in advance (Frontier).

United’s Basic Economy matters because United flies 179 of IAH’s 192 mapped destinations. On flights other than those to South America and across the Atlantic or Pacific, Basic Economy passengers cannot bring a full-size carry-on on board, an oversized personal item costs $75 at the gate, and checked bags bought from 3 April 2026 start at $45 prepaid, $50 in the lobby and $75 at the gate (United). Our basic economy hidden-fees checklist and US carry-on rules go through the rest.

When is a positioning flight or the other airport worth it from Houston?

Switching between IAH and Hobby is the positioning move that pays most often, because the two airports sell different airlines and both have $4.50 express buses to downtown. Flying first to Dallas, Austin or San Antonio on a separate ticket is worth testing only when the saving is large, and it carries the risk of a missed connection.

The route map shows how easy those hops are to arrange: United flies IAH to Austin, San Antonio and DFW, American flies both IAH and Hobby to DFW, and Southwest links Hobby with Dallas Love Field, Austin and San Antonio (Houston Airports). Positioning to DFW makes sense mainly when an American Airlines or oneworld long-haul fare from Dallas undercuts what IAH offers by more than the cost of the hop and a night’s buffer.

If you do build a self-transfer, size the gap with Houston Airports’ own guidance: it says most travellers find 45 to 60 minutes enough for a domestic connection at IAH and recommends 90 minutes to two hours when arriving from abroad and clearing US Customs (Houston Airports). On separate tickets, treat those as minimums rather than targets, because a missed onward flight is your loss, not the airline’s; see separate-ticket risk and what a self-transfer is.

Crossing town between the two airports by public transport means riding into downtown on one 500 bus and out on the other, so allow generously; a taxi or ride-hail is quicker but still a separate journey. Our positioning flights guide explains when the arithmetic works.

How far ahead should you book flights from Houston?

For domestic trips, Google’s October 2026 analysis of US departures found the lowest average prices about 39 days out, within a 22 to 57 day range. Mexico and the Caribbean bottomed out around 43 days, Europe around 90. Houston Airports advises booking at least 30 days ahead, and two to three months for European summer.

Google’s figures, published on 5 October 2026 from five years of aggregated Google Flights data, are averages across many routes, not promises for yours (Google). The same analysis found international fares lowest around 89 days out but with little movement across a wide window, which is Google’s way of saying there is no reward for waiting on long-haul.

Houston Airports’ own planning advice is cruder but points the same way: book at least 30 days ahead because summer, winter holidays and spring break fill fastest (Houston Airports), and lock in European summer flights from IAH two to three months out (Houston Airports). Treat those as the outer edges of a search window rather than a booking date.

Holiday travel shifts the timing. Google put the cheapest Christmas bookings about 56 days ahead and Thanksgiving about 34 days ahead, and found that leaving on a Monday and returning on a Tuesday or Wednesday averaged about 14% less than weekend flights (Google). Our guide to the best time to book flights sets out windows by route type.

When are flights from Houston busiest, and when is it quieter?

Houston Airports names summer, the winter holidays and spring break as the windows that fill fastest, with holidays, school breaks and long weekends driving the heaviest traffic. Its travel team pitches August and September as international shoulder season from IAH, after the July peak, while warning that September brings hurricane risk to the Caribbean.

These are demand patterns rather than price guarantees, but they are the closest thing to an official seasonal calendar for Houston departures. The airport authority’s 2026 planning article says midweek departures are a common off-peak choice for flexible travellers (Houston Airports), and its peak-travel guide notes that Houston’s spikes in summer and over the winter holidays mirror national trends (Houston Airports).

For trips abroad, Houston Airports argues that August and September bring lower hotel and attraction rates than the July peak, with Europe’s weather still good, and it suggests early September for the Caribbean because hurricane risk builds later in the month (Houston Airports). Pair that with Google’s finding that July and August trips bottomed out only about 21 days before departure (Google).

For an alert routine that catches short-lived drops in these quieter weeks, see how holiday deal alerts work.

Are MileagePlus miles or Rapid Rewards points worth using from Houston?

Use whichever programme matches your airport. United, which flies 179 of IAH’s mapped destinations, says MileagePlus miles never expire and can pay for partner flights, bags or part of a fare. Southwest’s Rapid Rewards has no blackout dates and no expiry, which suits Hobby. Always compare the points price against the cash fare first.

United’s MileagePlus page says miles never expire, that members can put them towards checked-bag fees as well as award flights, and that a Money + Miles option lets miles cover part of a fare; it adds that United’s international airline partners accept miles as a form of payment (United). For a Houston household that flies United most of the year, that makes MileagePlus the natural place to concentrate.

At Hobby, Southwest says Rapid Rewards points can be used for any seat with no blackout dates and do not expire, and that a Cash + Points option combines the two. It has also announced a new version of the programme starting on 1 January 2027, so check the earning and redemption rules again before then (Southwest).

Whichever currency you hold, price the same trip in cash first: if the fare is low, your points may stretch further on a peak-date ticket later. Our guides to MileagePlus and Rapid Rewards cover earning, and our review of the United Club at IAH covers the lounge side of a long IAH layover.

How should you use flight search tools for Houston departures?

Search IAH and HOU together, ideally as a month view, so United, Southwest and the smaller airlines land on one screen. Then open the cheapest result’s fare brand to see what bags and seats it includes, set a price alert, and run a second search on another engine before paying.

Most engines accept two departure airports in one search; enter IAH and HOU rather than relying on a city name, then use a calendar or date grid to see a whole month. Our Google Flights date-grid guide shows the layout, and which search tool to use when covers the rest of the toolkit.

A metasearch result is only as good as its fare brand. Before paying, open the fare details and check whether the price is a basic fare without bags, which airline actually operates each flight, and whether the itinerary is on one ticket. If an engine leaves out an airline that flies your route, price that airline separately so the comparison is complete.

For a second opinion, Aviasales and Trip.com can surface combinations and sellers that other engines miss; our comparison of Aviasales, Google Flights and Skyscanner explains the differences. Fares that look impossibly low may be errors, so read our mistake-fares guide before booking hotels around one, and know the 24-hour cancellation rules for US bookings.

What mistakes cost the most when booking from Houston?

The costly ones are searching one airport, comparing a fare without bags against one that includes them, and trusting pre-May 2026 fare memories that include Spirit. Others are booking a separate-ticket connection with less than Houston Airports’ suggested buffer, and redeeming points when the cash fare is low. A five-minute check avoids each.

Each of these mistakes has a quick fix that uses the sources on this page. Check both airports on the route map, read the fare brand before comparing totals, and add any bag you will really take at the price the airline quotes in advance rather than at the airport.

Before a self-transfer, compare your gap with the connection times Houston Airports publishes, and before redeeming points, note the cash price for the same flights. Keep a copy of the fare rules and cancellation terms with your booking.

• Search IAH and HOU together; their main airlines do not overlap.
• Add checked bags at advance prices, not airport prices.
• Check whether a Basic Economy fare allows a full-size carry-on on your route.
• Ignore saved Spirit fares; the airline shut down on 2 May 2026.
• Give separate-ticket connections at least Houston Airports’ suggested time.
• Compare the points price with cash before redeeming.