Travel with Axel,
get the best price.

Route overview: Kansas City to Seattle (SEA) flight deals

Kansas City → Seattle

Dec 21, 2026 · return Dec 28, 2026

MCI → SEA1 adulteconomyRound trip

8 flight options · 4 airlines

Nonstop flights

Mon, Dec 21 – Mon, Dec 28

Alaska Airlines
7:00 amMCI
4h 9m
Nonstop
9:09 amSEA
Alaska Airlines
6:34 pmSEA
3h 25m
Nonstop
11:59 pmMCI

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Dec 28

Alaska Airlines
2:52 pmMCI
4h 4m
Nonstop
4:56 pmSEA
Alaska Airlines
6:34 pmSEA
3h 25m
Nonstop
11:59 pmMCI

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Mon, Dec 28

Southwest Airlines
5:20 amMCI
7h 15m
DAL · 1h 10m
10:35 amSEA
Southwest Airlines
9:25 amSEA
5h 10m
DEN · 1h
4:35 pmMCI

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Dec 28

United Airlines
7:00 amMCI
7h 18m
SFO · 1h
12:18 pmSEA
United Airlines
5:05 amSEA
5h 23m
DEN · 1h 3m
12:28 pmMCI

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Dec 28

Delta Air Lines
7:00 amMCI
4h 11m
Nonstop
9:11 amSEA
Delta Air Lines
9:18 amSEA
5h 51m
SLC · 1h 16m
5:09 pmMCI

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Dec 28

Southwest Airlines
6:30 pmMCI
6h 20m
DEN · 1h 15m
10:50 pmSEA
Southwest Airlines
9:25 amSEA
5h 10m
DEN · 1h
4:35 pmMCI

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Dec 28

Southwest Airlines
1:30 pmMCI
7h 10m
SMF · 1h 25m
6:40 pmSEA
Southwest Airlines
9:25 amSEA
5h 10m
DEN · 1h
4:35 pmMCI

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Mon, Dec 28

United Airlines
9:48 amMCI
7h 44m
ORD · 1h 11m
3:32 pmSEA
United Airlines
5:05 amSEA
5h 23m
DEN · 1h 3m
12:28 pmMCI

Round-trip total · 1 adult · Taxes included

Make this trip yours

MCI ⇄ SEA

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, Alaska Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

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. How Axel works · About

Explore this route

All dates for this routeDec 20, 2026 → Dec 27, 2026Dec 22, 2026 → Dec 29, 2026
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Route overview: Kansas City to Seattle (SEA) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-28Alaska AirlinesAS563 / AS497$470.382026-10-29T01:28:15Z
2026-12-21 → 2026-12-28Southwest AirlinesWN1349 + WN534 / WN2150 + WN2075$437.252026-10-29T01:28:15Z
2026-12-21 → 2026-12-28United AirlinesUA2051 + UA2192 / UA757 + UA2159$463.752026-10-29T01:28:15Z
2026-12-21 → 2026-12-28Delta Air LinesDL2105 / DL1016 + DL2903$470.632026-10-29T01:28:15Z
2026-12-21 → 2026-12-28Alaska AirlinesAS418 / AS497$470.382026-10-29T01:28:15Z
2026-12-21 → 2026-12-28Southwest AirlinesWN1491 + WN3141 / WN2150 + WN2075$437.252026-10-29T01:28:15Z
2026-12-21 → 2026-12-28Southwest AirlinesWN2769 + WN1586 / WN2150 + WN2075$437.252026-10-29T01:28:15Z
2026-12-21 → 2026-12-28United AirlinesUA5270 + UA1660 / UA757 + UA2159$463.752026-10-29T01:28:15Z

2026-12-21 → 2026-12-28 · $470.38

  • Alaska Airlines AS563: MCI 2026-12-21 07:00:00 → SEA 2026-12-21 09:09:00; nonstop; 249 minutes. Local airport times.
  • Alaska Airlines AS497: SEA 2026-12-28 18:34:00 → MCI 2026-12-28 23:59:00; nonstop; 205 minutes. Local airport times.

2026-12-21 → 2026-12-28 · $437.25

  • Southwest Airlines WN1349 / WN534: MCI 2026-12-21 05:20:00 → SEA 2026-12-21 10:35:00; 1 stop(s) via DAL; 435 minutes. Local airport times.
    • WN1349: MCI 2026-12-21 05:20:00 → DAL 2026-12-21 07:00:00; layover at DAL: 70 minutes.
    • WN534: DAL 2026-12-21 08:10:00 → SEA 2026-12-21 10:35:00.
  • Southwest Airlines WN2150 / WN2075: SEA 2026-12-28 09:25:00 → MCI 2026-12-28 16:35:00; 1 stop(s) via DEN; 310 minutes. Local airport times.
    • WN2150: SEA 2026-12-28 09:25:00 → DEN 2026-12-28 13:00:00; layover at DEN: 60 minutes.
    • WN2075: DEN 2026-12-28 14:00:00 → MCI 2026-12-28 16:35:00.

2026-12-21 → 2026-12-28 · $463.75

  • United Airlines UA2051 / UA2192: MCI 2026-12-21 07:00:00 → SEA 2026-12-21 12:18:00; 1 stop(s) via SFO; 438 minutes. Local airport times.
    • UA2051: MCI 2026-12-21 07:00:00 → SFO 2026-12-21 09:05:00; layover at SFO: 60 minutes.
    • UA2192: SFO 2026-12-21 10:05:00 → SEA 2026-12-21 12:18:00.
  • United Airlines UA757 / UA2159: SEA 2026-12-28 05:05:00 → MCI 2026-12-28 12:28:00; 1 stop(s) via DEN; 323 minutes. Local airport times.
    • UA757: SEA 2026-12-28 05:05:00 → DEN 2026-12-28 08:42:00; layover at DEN: 63 minutes.
    • UA2159: DEN 2026-12-28 09:45:00 → MCI 2026-12-28 12:28:00.

2026-12-21 → 2026-12-28 · $470.63

  • Delta Air Lines DL2105: MCI 2026-12-21 07:00:00 → SEA 2026-12-21 09:11:00; nonstop; 251 minutes. Local airport times.
  • Delta Air Lines DL1016 / DL2903: SEA 2026-12-28 09:18:00 → MCI 2026-12-28 17:09:00; 1 stop(s) via SLC; 351 minutes. Local airport times.
    • DL1016: SEA 2026-12-28 09:18:00 → SLC 2026-12-28 12:31:00; layover at SLC: 76 minutes.
    • DL2903: SLC 2026-12-28 13:47:00 → MCI 2026-12-28 17:09:00.

2026-12-21 → 2026-12-28 · $470.38

  • Alaska Airlines AS418: MCI 2026-12-21 14:52:00 → SEA 2026-12-21 16:56:00; nonstop; 244 minutes. Local airport times.
  • Alaska Airlines AS497: SEA 2026-12-28 18:34:00 → MCI 2026-12-28 23:59:00; nonstop; 205 minutes. Local airport times.

2026-12-21 → 2026-12-28 · $437.25

  • Southwest Airlines WN1491 / WN3141: MCI 2026-12-21 18:30:00 → SEA 2026-12-21 22:50:00; 1 stop(s) via DEN; 380 minutes. Local airport times.
    • WN1491: MCI 2026-12-21 18:30:00 → DEN 2026-12-21 19:25:00; layover at DEN: 75 minutes.
    • WN3141: DEN 2026-12-21 20:40:00 → SEA 2026-12-21 22:50:00.
  • Southwest Airlines WN2150 / WN2075: SEA 2026-12-28 09:25:00 → MCI 2026-12-28 16:35:00; 1 stop(s) via DEN; 310 minutes. Local airport times.
    • WN2150: SEA 2026-12-28 09:25:00 → DEN 2026-12-28 13:00:00; layover at DEN: 60 minutes.
    • WN2075: DEN 2026-12-28 14:00:00 → MCI 2026-12-28 16:35:00.

2026-12-21 → 2026-12-28 · $437.25

  • Southwest Airlines WN2769 / WN1586: MCI 2026-12-21 13:30:00 → SEA 2026-12-21 18:40:00; 1 stop(s) via SMF; 430 minutes. Local airport times.
    • WN2769: MCI 2026-12-21 13:30:00 → SMF 2026-12-21 15:15:00; layover at SMF: 85 minutes.
    • WN1586: SMF 2026-12-21 16:40:00 → SEA 2026-12-21 18:40:00.
  • Southwest Airlines WN2150 / WN2075: SEA 2026-12-28 09:25:00 → MCI 2026-12-28 16:35:00; 1 stop(s) via DEN; 310 minutes. Local airport times.
    • WN2150: SEA 2026-12-28 09:25:00 → DEN 2026-12-28 13:00:00; layover at DEN: 60 minutes.
    • WN2075: DEN 2026-12-28 14:00:00 → MCI 2026-12-28 16:35:00.

2026-12-21 → 2026-12-28 · $463.75

  • United Airlines UA5270 / UA1660: MCI 2026-12-21 09:48:00 → SEA 2026-12-21 15:32:00; 1 stop(s) via ORD; 464 minutes. Local airport times.
    • UA5270: MCI 2026-12-21 09:48:00 → ORD 2026-12-21 11:34:00; layover at ORD: 71 minutes.
    • UA1660: ORD 2026-12-21 12:45:00 → SEA 2026-12-21 15:32:00.
  • United Airlines UA757 / UA2159: SEA 2026-12-28 05:05:00 → MCI 2026-12-28 12:28:00; 1 stop(s) via DEN; 323 minutes. Local airport times.
    • UA757: SEA 2026-12-28 05:05:00 → DEN 2026-12-28 08:42:00; layover at DEN: 63 minutes.
    • UA2159: DEN 2026-12-28 09:45:00 → MCI 2026-12-28 12:28:00.

Explore this route