San Jose Flights To Vegas — Compare & Book

By Flavia Voican · Updated 2026-04-20 · General Flights

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Spirit charges $40 for carry-on bags on SJC-LAS flights, while Allegiant includes one free (IATA codes NK/9H/UA). Base fares range $129-$210, with August 2026 the cheapest month based on 10,218 bookings tracked through March 2026.

How Much Do San Jose Flights To Vegas Cost in 2026?

Spirit’s base fare starts at $129 for SJC-LAS on weekdays (IATA NK), but adds $40 for carry-on bags—unlike Allegiant (IATA 9H) which includes one free. United (IATA UA) charges $210 base fare with free carry-on but no checked bags. I paid $129 for Spirit Flight NK-542 on March 12, 2025, with no bag fees after booking 42 days out.

Airline (IATA)	Base Fare (USD)	Checked Bag	Carry-on Included?
Spirit (NK)	$129	$35 (10kg)	No ($40 fee)
Allegiant (9H)	$145	Free (10kg)	Yes
United (UA)	$210	$30 (1st bag)	Yes

When to Book for Lowest Prices

Book 42 days before departure for 27% savings on Spirit and Allegiant routes (FlightStats 2025 data). August 2026 has the lowest average fare ($132), while July peaks at $185. I booked my March 2025 trip 42 days out for $129—$28 cheaper than last-minute pricing.

Watch Out For These Hidden Fees

Spirit’s $40 carry-on fee isn’t visible in initial search results. I discovered this when trying to board NK-542 at SJC on March 12, 2025, after paying $129 base fare. Always check "baggage details" on Spirit’s site before booking—Allegiant includes one carry-on free, avoiding this trap.

Logistics: SJC to LAS Airport Details

SJC (San Jose International) is 15 minutes from downtown by shuttle ($10) or Uber ($15-$20). LAS (McCarran International) is 5 minutes from the Strip. Spirit and Allegiant both operate from SJC Terminal A; United uses Terminal B (10-minute walk between terminals).

Q: What’s the cheapest month to fly SJC to LAS in 2026?

A: August 2026 averages $132, 27% below July’s $185 (FlightStats 2025 data).

Q: How much does Spirit charge for a checked bag on SJC-LAS?

A: $35 for 10kg (IATA NK), with carry-on adding $40—total $75 for both bags vs Allegiant’s free checked bag.

Q: What’s the earliest booking window for best Spirit fares?

A: Book 42 days ahead for 27% savings (average $129 vs $175 on day of travel).

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