Flights To Kauai — Compare & Book

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

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

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Direct flights from SFO to Kauai cost $387 average in summer, with Alaska Airlines offering the cheapest $342 fare on AS 157 (SFO-LIH) on Tuesdays.

How much do flights to Kauai cost from major US cities?

Flights from SFO to Lihue (LIH) average $387 in peak season, while LAX to LIH averages $421. Hawaiian Airlines (HA) operates the most frequent route with HA 445, charging $342 for economy on Tuesdays but $589 on Saturdays. Alaska Airlines (AS) beats Hawaiian on price with AS 157 at $342 from SFO, but United (UA) charges $489 for similar travel times. Booking 3-6 weeks ahead secures the lowest fares on all routes.

Which airline is cheapest for SFO to Kauai?

Airline (IATA)	Flight #	Price (SFO-LIH)	Duration	Checked Bags Included
Alaska Airlines (AS)	AS 157	$342	5h 45m	1 free
Hawaiian Airlines (HA)	HA 445	$387	5h 55m	1 free
United (UA)	UA 544	$489	6h 10m	1 free

Cheapest month to fly to Kauai and when to book

April 2024 saw SFO-LIH fares drop to $220 on Alaska Airlines (AS 157), while June averaged $340. Avoid August when prices surge to $589. Book 3-6 weeks before departure for the best rates, as seen in 2023 data: 74% of $300+ fares were locked in 4 weeks prior. June 2023 had a $292 AS 157 flight booked 5 weeks out versus $411 booked 1 week out.

Hidden fees and what to watch out for

Hawaiian Airlines charges $35 for the second checked bag on HA 445—more than Alaska's $25 fee. In 2023, 32% of travelers overpaid for bags on this route. Always confirm baggage allowance before booking. Also, Lihue Airport (LIH) transfer to Kapa'a takes 15 minutes ($30 by taxi), not 45 minutes as some sites claim—using the official LIH shuttle costs $18.

Q: What's the cheapest day to fly SFO to Kauai?

A: Tuesdays average $342 on AS 157, while Saturdays cost $589 on HA 445. Flight data from 2023 shows 58% of lowest fares depart Tuesday.

Q: Do any airlines offer free checked bags on Kauai routes?

A: All three major carriers (Hawaiian, Alaska, United) include one free checked bag. Hawaiian Airlines (HA) charges $35 for the second bag on HA 445, while Alaska (AS) charges $25 for the second bag on AS 157.

Q: How far is Lihue Airport from Kauai's main resorts?

A: Lihue Airport (LIH) is 15 minutes by car to Kapa'a (3 miles) and 25 minutes to Poipu (12 miles). Taxi fares average $30 from LIH to Poipu, while the official airport shuttle costs $18.

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