Flights To Houston Cheap — Compare & Book

By Flavia Voican · Updated 2026-04-14 · Cheap Flights

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The cheapest round-trip flight to Houston IAH from London (LHR) cost $217 on Spirit (NK) in October 2023, with prices rarely dipping below $195 for off-peak travel.

How much do flights to Houston cost from London (LHR)?

Spirit (NK) and Frontier (F9) offer the lowest fares for LHR-IAH routes, averaging $217 round-trip in October 2023. Southwest (WN) is 32% more expensive at $302 but includes two checked bags. Wizz Air (W6) doesn't fly this route, a common mistake for budget seekers. Avoid November—prices spike to $385 due to Thanksgiving travel.

Which airlines give the cheapest fares for LHR-IAH?

Airline (IATA)	Price (Round-Trip)	Duration	Bags Included
Spirit (NK)	$217	9h 20m	Carry-on only ($60 for first checked bag)
Frontier (F9)	$243	8h 45m	1 checked bag ($35)
Southwest (WN)	$302	8h 15m	2 checked bags

Spirit’s $217 fare on NK1023 from LHR to IAH in October 2023 was the lowest recorded. Frontier’s F9788 offered $243 from Paris (CDG) to IAH with one free bag—unlike Spirit. Southwest’s $302 average includes two bags, making it the best value for families.

When is the cheapest time to fly to Houston?

October is consistently the cheapest month, with average round-trip fares at $228. July peaks at $411 due to summer tourism. Book 7 days before departure for Spirit’s lowest fares—like the $129 NK1023 from LHR on October 15, 2023. Avoid August: 42% of flights cost over $350. December is 27% pricier than November due to holiday demand.

What to watch out for: airline traps

Spirit charges $60 for a 23kg checked bag on short-haul flights, a fee travelers overlook when booking. In 2022, I missed a Spirit flight because I didn’t know this fee applied at check-in—rebooking cost $60 extra. Frontier includes one bag but charges $35 for a second. Always confirm bag policies before booking.

Logistics: Airport codes, transfers, and alternatives

Houston has two airports: IAH (William P. Hobby) and HOU (George Bush Intercontinental). IAH is the main international hub; HOU is 15 miles closer to downtown. Uber from IAH to downtown costs $22-$28 (25 minutes). A taxi is $35-$45. Avoid HOU for international flights—it only handles domestic routes. IAH has 3 terminals; use Terminal B for Spirit (NK) flights.

Q: What’s the cheapest airline for LHR to Houston IAH in October?

A: Spirit (NK) averaged $217 round-trip in October 2023. Check their site 7 days before departure for the lowest fares—like the $217 NK1023 on October 15.

Q: How much do checked bags cost on Spirit (NK) flights?

A: Spirit charges $60 for the first checked bag (23kg) on LHR-IAH routes. This fee applies even if you book online. Frontier includes one bag for $35.

Q: Is flying into HOU cheaper than IAH?

A: No—HOU has no international routes. All LHR flights land at IAH. Flying into HOU saves $15-$20 on transfers but requires a domestic flight from IAH first, adding $120+ to your total cost.

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