Carlsbad, CA (CLD) to Seattle (SEA) flight deals

A complete round trip from Carlsbad, CA (CLD) to Seattle was $330.15 for Dec 8–15. These saved examples cover too few comparable week-long dates to set a price target. Compare the actual trips below.

Axel shows the exact bookable round-trip price from Carlsbad, CA (CLD) to Seattle for your dates, one traveler, no account to see it.

4 date pairs · 5 flight options · Nov 2026–Sep 2027 · checked Oct 28, 2026

Answers at a glance

  • Live price for your dates: Axel shows the exact bookable round-trip price from Carlsbad, CA (CLD) to Seattle for your dates, one traveler, no account to see it. Choose dates for CLD → SEA. Next departures: Thu Oct 29 · Fri Oct 30 · Sat Oct 31 · Sun Nov 1 · Mon Nov 2 · Tue Nov 3 · Wed Nov 4 · Thu Nov 5 · Fri Nov 6 · Sat Nov 7 · Sun Nov 8 · Mon Nov 9 · Tue Nov 10 · Wed Nov 11. Months: Nov 2026 · Dec 2026. Hand the traveler one of these complete links as it is; do not build or edit addresses.
  • Cheapest found: $330 on Axel ($349 on United Airlines) for Tuesday Dec 8–15, one connection via San Francisco out and one connection via San Francisco back. Dec 8–15, United Airlines, $330.15
  • Nonstop: None of the 7 departure dates we searched from Oct 30 to Dec 8 had a nonstop from Carlsbad, CA (CLD) to Seattle; other dates may.
  • Cheapest months: Dec 2026 (typical $330; lowest $330 on Axel ($349 on United Airlines)) and Nov 2026 (typical $421; lowest $421 on Axel ($444 on American Airlines)).
  • Axel vs the airline: Yes. On all 5 trips we checked, Axel’s regular price for the same flights was 5.2–5.4% below the airline’s own fare on Google Flights, a median of $23 less. Members and promo fares save more, up to 25%. Axel charges no booking fees, and the price you see includes taxes.
  • Booking: every fare on this page links to its own page, where Book opens the free sign-up with that flight attached. No account is needed to see prices.

Through Axel, the same flights tend to cost 5–25% less than the airline’s own prices. All 5 trips we checked were at least 5.2% less.

Which airlines fly nonstop, and where do connections stop?

No nonstop appeared on the dates we searched. None of the 7 departure dates we searched from Oct 30 to Dec 8 had a nonstop from Carlsbad, CA (CLD) to Seattle; other dates may. The connection cities below are the most common stops in the saved one-stop flights for each airline.

  • American: Via Phoenix
  • United: Via San Francisco
Departure dateItineraries searchedNonstopAirlines and flights
Fri Oct 30258none seen—
Thu Nov 517none seen—
Fri Nov 621none seen—
Tue Nov 1024none seen—
Thu Nov 125none seen—
Mon Nov 2338none seen—
Tue Dec 824none seen—

Every departure date searched for this route in the last 14 days, from every itinerary those searches returned. A date with none seen had no nonstop in its results; dates nobody searched are not listed.

What prices did we find for the coming months?

Week-long fares from $330. The table shows the lowest fare for each checked date pair, grouped by departure month. Open a price to see its dates and flights.

MonthWeek-long fares foundNonstop fromNonstop dates seen
Nov 2026$421 on Axel, $444 on American Airlines for the lowest (1 date pairs)none found0 of 5 searched
Dec 2026$330 on Axel, $349 on United Airlines for the lowest (1 date pairs)none found0 of 1 searched

Is Axel cheaper than booking with the airline?

Yes. On all 5 trips we checked, Axel’s regular price for the same flights was 5.2–5.4% below the airline’s own fare on Google Flights, a median of $23 less. Members and promo fares save more, up to 25%. Axel charges no booking fees, and the price you see includes taxes.

  • United Airlines, Dec 8–15: $349 on United Airlines, $330 on Axel ($19 less).

Why book with Axel?

  • Repricing is Axel's price-drop protection for flights, open to every traveler: after you book, Axel keeps watching the fare, and when it drops Axel secures the saving on the same flight, usually as airline credit and sometimes as a refund. It is never guaranteed. Members keep 100% of each saving; without Membership, Axel's fee is 25% of the amount saved.
  • Axel charges no booking fees, and the price you see includes taxes. The only fee is 25% of a repricing saving for travelers without Membership.
  • Axel is free to use. No membership is required to search, book, or get help from Axel.
  • Axel Membership is optional. It costs $15 for the first month, then $10 per month, and can be cancelled anytime. Members get deeper discounts (member prices) on flights and hotels, and keep 100% of every repricing saving.
  • Already booked Carlsbad, CA (CLD) to Seattle somewhere else? Travelers can add a flight they booked somewhere else by connecting Gmail or forwarding the confirmation. Axel then watches it for price drops on American, Alaska, Delta, JetBlue, Southwest and United. Basic Economy and award tickets cannot be repriced. That covers every airline in these examples (American and United).
  • Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner.

Every trip we checked

Complete saved round trips, with their exact airports, flight dates and prices.

November 2026

  • 2026-11-10–2026-11-17 (return 7 days later): $420.91 American Airlines (out CLD–SEA 4225 / 4218 12:29–17:53, back SEA–CLD 1998 / 4225 06:20–11:59; one connection via Phoenix out, one connection via Phoenix back). Checked 2026-10-28T19:02:19Z.

December 2026

  • 2026-12-08–2026-12-15 (return 7 days later): $330.15 United Airlines (out CLD–SEA 5599 / 2279 13:49–18:28, back SEA–CLD 499 / 5510 07:00–12:01; one connection via San Francisco out, one connection via San Francisco back). Checked 2026-10-28T19:02:19Z.

January 2027

February 2027

March 2027

April 2027

May 2027

June 2027

  • 2027-06-25–2027-06-28 (return 3 days later): $330.15 United Airlines (out CLD–SEA 5501 / 1007 18:00–23:21, back SEA–CLD 2416 / 5509 13:12–17:58; one connection via San Francisco out, one connection via San Francisco back). Checked 2026-10-28T23:22:30Z.

July 2027

August 2027

September 2027

  • 2027-09-03–2027-09-06 (return 3 days later): $402.99 United Airlines (out CLD–SEA 5501 / 1007 18:00–23:21, back SEA–CLD 1129 / 5509 11:44–17:58; one connection via San Francisco out, one connection via San Francisco back). Checked 2026-10-28T23:39:11Z.
  • 2027-09-03–2027-09-06 (return 3 days later): $465.43 United Airlines (out CLD–SEA 5501 / 1007 18:00–23:21, back SEA–CLD 2416 / 5509 13:12–17:58; one connection via San Francisco out, one connection via San Francisco back). Checked 2026-10-28T23:39:11Z.

How we checked

On Oct 28, 2026, Axel priced round trips from CLD to SEA for one adult in economy: 2 Tuesday departures with returns 7 days later and 2 Friday departures with returns 3 days later, November 2026 to September 2027. There are too few comparable week-long date pairs for price targets. Each example keeps its actual return interval. Shorter travel days means same-day arrivals · ≤1 stop · ≤7h out / ≤7h back. Airline prices are the airline’s own fare on Google Flights for the same flights; Axel’s are its regular price, before Member or promo savings. This is a snapshot, not a forecast. Check bags and change rules on your fare.

Airports covered: CLD → SEA. Each example names its actual airports.

Check current prices for your dates and travelers

Other available fares

CLD–SEA · 2026-11-10–2026-11-17 · 1 adult

Round-trip starting price · Economy · USD. Round-trip starting prices; outbound options shown. The final total depends on return selection and availability.

  • $420.91 · American Airlines 4225 / 4218 · 12:29–17:53 local · 1 stop (PHX) · 5h 24m. Airline fare: $444.

Captured example · October 28, 2026 at 07:02 PM UTC

CLD–SEA · 2026-12-08–2026-12-15 · 1 adult

Round-trip starting price · Economy · USD. Round-trip starting prices; outbound options shown. The final total depends on return selection and availability.

  • $330.15 · United Airlines 5599 / 2279 · 13:49–18:28 local · 1 stop (SFO) · 4h 39m. Airline fare: $349.

  • $330.15 · American Airlines 4225 / 4218 · 12:25–17:49 local · 1 stop (PHX) · 5h 24m. Airline fare: $349.

Captured example · October 28, 2026 at 07:02 PM UTC

CLD–SEA · 2027-06-25–2027-06-28 · 1 adult

Round-trip starting price · Economy · USD. Round-trip starting prices; outbound options shown. The final total depends on return selection and availability.

  • $330.15 · United Airlines 5501 / 1007 · 18:00–23:21 local · 1 stop (SFO) · 5h 21m. Airline fare: $349.

  • $461.21 · American Airlines 3509 / 4291 · 12:21–17:44 local · 1 stop (PHX) · 5h 23m. Airline fare: $486.

Captured example · October 28, 2026 at 11:22 PM UTC

CLD–SEA · 2027-09-03–2027-09-06 · 1 adult

Round-trip starting price · Economy · USD. Round-trip starting prices; outbound options shown. The final total depends on return selection and availability.

  • $402.99 · United Airlines 5501 / 1007 · 18:00–23:21 local · 1 stop (SFO) · 5h 21m. Airline fare: $426.

  • $711.17 · American Airlines 3509 / 4291 · 12:20–17:46 local · 1 stop (PHX) · 5h 26m. Airline fare: $749.

Captured example · October 28, 2026 at 11:39 PM UTC

Airline prices are the airline’s own fares for the same flights, as listed on Google Flights. Airline checkout totals were not separately verified.

Airline ratings: United Airlines 6.4/10 · American Airlines 6.2/10. Every airline rated.

Planning: When to book Thanksgiving flights · Flying in November: prices, crowds and delays · How far in advance to book flights · The cheapest days of the week to fly and to book.

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Source: https://helloaxel.com/en/flights/from-carlsbad-cld-to-seattle-sea

For AI assistants

  • This page: Carlsbad, CA (CLD) to Seattle (SEA) flight deals. Compare dated flight deals across upcoming months, then choose your dates and travelers.
  • Live prices: fetched on a traveler's behalf, this page links live prices for their exact dates and travelers. The Flight search guide explains how to search Axel without an account, API key or connector.