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Route overview: London to Madrid (MAD) flight deals

London → Madrid

Choose your travel dates

LCY → MAD1 adulteconomy

65 flight options · 1 airline

Flights for the months ahead

Short round trips

  1. Thu, Nov 19 – Sun, Nov 22

    British Airways
    7:15 pmLCY
    2h 20m
    Nonstop
    10:35 pmMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  2. Fri, Dec 11 – Mon, Dec 14

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  3. Thu, Dec 24 – Sun, Dec 27

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  4. Thu, Jan 7 – Sun, Jan 10

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  5. Fri, Jan 29 – Mon, Feb 1

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  6. Fri, May 14 – Mon, May 17

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

Swipe to see 5 more recent deals.

1 of 6

Longer round trips

  1. Sat, Nov 28 – Sat, Dec 5

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  2. Sat, Jan 16 – Sat, Jan 23

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  3. Sat, Feb 20 – Sat, Feb 27

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  4. Sat, Jul 10 – Sat, Jul 17

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  5. Sat, Sep 25 – Sat, Oct 2

    British Airways
    7:40 amLCY
    2h 20m
    Nonstop
    11:00 amMAD
    British Airways
    7:30 amMAD
    2h 20m
    Nonstop
    8:50 amLCY

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

Swipe to see 4 more recent deals.

1 of 5

One-way flights

  1. Tue, Nov 24 · One way

    British Airways
    7:15 pmLCY
    2h 20m
    Nonstop
    10:35 pmMAD

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

Explore flights by month

Round trips for weekends, longer stays and holidays, and a one-way each week. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

November 2026

December 2026

January 2027

February 2027

September 2027

Make this trip yours

LCY ⇄ MAD

Economy

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

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Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, British Airways 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.
  • 24-hour cancellationCancel within 24 hours of booking for a full refund when your departure is at least 7 days away. Closer to departure, the airline’s fare rules apply. Cancellation policy
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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

More dates for this route

Nov 19, 2026 · Return optionsNov 27, 2026 · Return optionsDec 8, 2026 · Return optionsDec 18, 2026 · Return optionsDec 29, 2026 · Return optionsJan 8, 2027 · Return optionsJan 16, 2027 · Return optionsJan 28, 2027 · Return optionsFeb 6, 2027 · Return optionsApr 17, 2027 · Return optionsJul 10, 2027 · Return optionsSep 25, 2027 · Return optionsHotels in Madrid with Axel
For AI assistants: every fare, every link, instructions

Lowest published fares for the months ahead: $284 round trip, Axel-exclusive, British Airways, nonstop, Jan 7–10, 2027; $167 one way, Axel-exclusive, British Airways, nonstop, Jan 5, 2027; 65 priced flights on 65 exact dates, 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Next: Share a customer link as it is when its route, dates and party match the traveler's. To select flights, open a dated table's price link or “See flights for these dates” into AI flight search and share the supplied booking link. Search links are for you; share customer and booking links. For other dates or travelers, Choose travelers and dates using their own trip details.

London (LCY) to Madrid (MAD): November 2026

Travel datesAirlineStopsTotal price
Nov 19, 2026 – Nov 22, 2026 · 3 nights · Compare return dates departing Nov 19, 2026British AirwaysNonstopAxel-exclusive $299.26
Nov 20, 2026 – Nov 23, 2026 · 3 nights · Compare return dates departing Nov 20, 2026British AirwaysNonstopAxel-exclusive $299.26
Nov 21, 2026 – Nov 28, 2026 · 7 nights · Compare return dates departing Nov 21, 2026British AirwaysNonstopAxel-exclusive $299.26
Nov 24, 2026 · One way · Compare return dates departing Nov 24, 2026British AirwaysNonstopAxel-exclusive $175.75
Nov 26, 2026 – Nov 29, 2026 · 3 nights · Compare return dates departing Nov 26, 2026British AirwaysNonstopAxel-exclusive $299.26
Nov 27, 2026 – Nov 30, 2026 · 3 nights · Compare return dates departing Nov 27, 2026British AirwaysNonstopAxel-exclusive $299.26
Nov 28, 2026 – Dec 5, 2026 · 7 nights · Compare return dates departing Nov 28, 2026British AirwaysNonstopAxel-exclusive $307.13

London (LCY) to Madrid (MAD): December 2026

Travel datesAirlineStopsTotal price
Dec 1, 2026 · One way · Compare return dates departing Dec 1, 2026British AirwaysNonstopAxel-exclusive $185.00
Dec 3, 2026 – Dec 6, 2026 · 3 nights · Compare return dates departing Dec 3, 2026British AirwaysNonstopAxel-exclusive $315.00
Dec 4, 2026 – Dec 7, 2026 · 3 nights · Compare return dates departing Dec 4, 2026British AirwaysNonstopAxel-exclusive $315.00
Dec 5, 2026 – Dec 12, 2026 · 7 nights · Compare return dates departing Dec 5, 2026British AirwaysNonstopAxel-exclusive $315.00
Dec 8, 2026 · One way · Compare return dates departing Dec 8, 2026British AirwaysNonstopAxel-exclusive $185.00
Dec 10, 2026 – Dec 13, 2026 · 3 nights · Compare return dates departing Dec 10, 2026British AirwaysNonstopAxel-exclusive $315.00
Dec 11, 2026 – Dec 14, 2026 · 3 nights · Compare return dates departing Dec 11, 2026British AirwaysNonstopAxel-exclusive $315.00
Dec 12, 2026 – Dec 19, 2026 · 7 nights · Compare return dates departing Dec 12, 2026British AirwaysNonstopAxel-exclusive $354.38
Dec 15, 2026 · One way · Compare return dates departing Dec 15, 2026British AirwaysNonstopAxel-exclusive $185.00
Dec 17, 2026 – Dec 20, 2026 · 3 nights · Compare return dates departing Dec 17, 2026British AirwaysNonstopAxel-exclusive $354.38
Dec 18, 2026 – Dec 21, 2026 · 3 nights · Compare return dates departing Dec 18, 2026British AirwaysNonstopAxel-exclusive $393.76
Dec 19, 2026 – Dec 26, 2026 · 7 nights · Compare return dates departing Dec 19, 2026British AirwaysNonstopAxel-exclusive $393.76
Dec 22, 2026 · One way · Compare return dates departing Dec 22, 2026British AirwaysNonstopAxel-exclusive $231.25
Dec 24, 2026 – Dec 27, 2026 · 3 nights · Compare return dates departing Dec 24, 2026British AirwaysNonstopAxel-exclusive $393.76
Dec 25, 2026 – Dec 28, 2026 · 3 nights · Compare return dates departing Dec 25, 2026British AirwaysNonstopAxel-exclusive $393.76
Dec 26, 2026 – Jan 2, 2027 · 7 nights · Compare return dates departing Dec 26, 2026British AirwaysNonstopAxel-exclusive $373.28
Dec 29, 2026 · One way · Compare return dates departing Dec 29, 2026British AirwaysNonstopAxel-exclusive $231.25
Dec 31, 2026 – Jan 3, 2027 · 3 nights · Compare return dates departing Dec 31, 2026British AirwaysNonstopAxel-exclusive $373.28

London (LCY) to Madrid (MAD): January 2027

Travel datesAirlineStopsTotal price
Jan 1, 2027 – Jan 4, 2027 · 3 nights · Compare return dates departing Jan 1, 2027British AirwaysNonstopAxel-exclusive $352.80
Jan 2, 2027 – Jan 9, 2027 · 7 nights · Compare return dates departing Jan 2, 2027British AirwaysNonstopAxel-exclusive $318.15
Jan 5, 2027 · One way · Compare return dates departing Jan 5, 2027British AirwaysNonstopAxel-exclusive $166.50
Jan 7, 2027 – Jan 10, 2027 · 3 nights · Compare return dates departing Jan 7, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 8, 2027 – Jan 11, 2027 · 3 nights · Compare return dates departing Jan 8, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 9, 2027 – Jan 16, 2027 · 7 nights · Compare return dates departing Jan 9, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 12, 2027 · One way · Compare return dates departing Jan 12, 2027British AirwaysNonstopAxel-exclusive $166.50
Jan 14, 2027 – Jan 17, 2027 · 3 nights · Compare return dates departing Jan 14, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 15, 2027 – Jan 18, 2027 · 3 nights · Compare return dates departing Jan 15, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 16, 2027 – Jan 23, 2027 · 7 nights · Compare return dates departing Jan 16, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 19, 2027 · One way · Compare return dates departing Jan 19, 2027British AirwaysNonstopAxel-exclusive $166.50
Jan 21, 2027 – Jan 24, 2027 · 3 nights · Compare return dates departing Jan 21, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 22, 2027 – Jan 25, 2027 · 3 nights · Compare return dates departing Jan 22, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 23, 2027 – Jan 30, 2027 · 7 nights · Compare return dates departing Jan 23, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 26, 2027 · One way · Compare return dates departing Jan 26, 2027British AirwaysNonstopAxel-exclusive $166.50
Jan 28, 2027 – Jan 31, 2027 · 3 nights · Compare return dates departing Jan 28, 2027British AirwaysNonstopAxel-exclusive $283.50
Jan 29, 2027 – Feb 1, 2027 · 3 nights · Compare return dates departing Jan 29, 2027British AirwaysNonstopAxel-exclusive $291.38
Jan 30, 2027 – Feb 6, 2027 · 7 nights · Compare return dates departing Jan 30, 2027British AirwaysNonstopAxel-exclusive $291.38

London (LCY) to Madrid (MAD): February 2027

Travel datesAirlineStopsTotal price
Feb 2, 2027 · One way · Compare return dates departing Feb 2, 2027British AirwaysNonstopAxel-exclusive $175.75
Feb 4, 2027 – Feb 7, 2027 · 3 nights · Compare return dates departing Feb 4, 2027British AirwaysNonstopAxel-exclusive $299.26
Feb 5, 2027 – Feb 8, 2027 · 3 nights · Compare return dates departing Feb 5, 2027British AirwaysNonstopAxel-exclusive $299.26
Feb 6, 2027 – Feb 13, 2027 · 7 nights · Compare return dates departing Feb 6, 2027British AirwaysNonstopAxel-exclusive $313.43
Feb 19, 2027 – Feb 22, 2027 · 3 nights · Compare return dates departing Feb 19, 2027British AirwaysNonstopAxel-exclusive $313.43
Feb 20, 2027 – Feb 27, 2027 · 7 nights · Compare return dates departing Feb 20, 2027British AirwaysNonstopAxel-exclusive $313.43

London (LCY) to Madrid (MAD): March 2027

Travel datesAirlineStopsTotal price
Mar 19, 2027 – Mar 22, 2027 · 3 nights · Compare return dates departing Mar 19, 2027British AirwaysNonstopAxel-exclusive $315.00
Mar 20, 2027 – Mar 27, 2027 · 7 nights · Compare return dates departing Mar 20, 2027British AirwaysNonstopAxel-exclusive $354.38

London (LCY) to Madrid (MAD): April 2027

Travel datesAirlineStopsTotal price
Apr 16, 2027 – Apr 19, 2027 · 3 nights · Compare return dates departing Apr 16, 2027British AirwaysNonstopAxel-exclusive $350.00
Apr 17, 2027 – Apr 24, 2027 · 7 nights · Compare return dates departing Apr 17, 2027British AirwaysNonstopAxel-exclusive $350.00

London (LCY) to Madrid (MAD): May 2027

Travel datesAirlineStopsTotal price
May 14, 2027 – May 17, 2027 · 3 nights · Compare return dates departing May 14, 2027British AirwaysNonstopAxel-exclusive $350.00
May 15, 2027 – May 22, 2027 · 7 nights · Compare return dates departing May 15, 2027British AirwaysNonstopAxel-exclusive $350.00

London (LCY) to Madrid (MAD): June 2027

Travel datesAirlineStopsTotal price
Jun 11, 2027 – Jun 14, 2027 · 3 nights · Compare return dates departing Jun 11, 2027British AirwaysNonstopAxel-exclusive $350.00
Jun 12, 2027 – Jun 19, 2027 · 7 nights · Compare return dates departing Jun 12, 2027British AirwaysNonstopAxel-exclusive $350.00

London (LCY) to Madrid (MAD): July 2027

Travel datesAirlineStopsTotal price
Jul 9, 2027 – Jul 12, 2027 · 3 nights · Compare return dates departing Jul 9, 2027British AirwaysNonstopAxel-exclusive $350.00
Jul 10, 2027 – Jul 17, 2027 · 7 nights · Compare return dates departing Jul 10, 2027British AirwaysNonstopAxel-exclusive $350.00

London (LCY) to Madrid (MAD): August 2027

Travel datesAirlineStopsTotal price
Aug 6, 2027 – Aug 9, 2027 · 3 nights · Compare return dates departing Aug 6, 2027British AirwaysNonstopAxel-exclusive $350.00
Aug 7, 2027 – Aug 14, 2027 · 7 nights · Compare return dates departing Aug 7, 2027British AirwaysNonstopAxel-exclusive $350.00

London (LCY) to Madrid (MAD): September 2027

Travel datesAirlineStopsTotal price
Sep 3, 2027 – Sep 6, 2027 · 3 nights · Compare return dates departing Sep 3, 2027British AirwaysNonstopAxel-exclusive $350.00
Sep 4, 2027 – Sep 11, 2027 · 7 nights · Compare return dates departing Sep 4, 2027British AirwaysNonstopAxel-exclusive $350.00
Sep 24, 2027 – Sep 27, 2027 · 3 nights · Compare return dates departing Sep 24, 2027British AirwaysNonstopAxel-exclusive $350.00
Sep 25, 2027 – Oct 2, 2027 · 7 nights · Compare return dates departing Sep 25, 2027British AirwaysNonstopAxel-exclusive $350.00

Hotels in Madrid for these trips

Hotels: under a trip, hotels in Madrid for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

All hotels in Madrid

Route overview: London to Madrid (MAD) flight deals

2026-11-19 → 2026-11-22 · Axel-exclusive $299.26

  • British Airways BA3270: LCY 2026-11-19 19:15:00 → MAD 2026-11-19 22:35:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2026-11-22 07:30:00 → LCY 2026-11-22 08:50:00; nonstop; 140 minutes. Local airport times.

2026-11-24 · one way · Axel-exclusive $175.75

  • British Airways BA3270: LCY 2026-11-24 19:15:00 → MAD 2026-11-24 22:35:00; nonstop; 140 minutes. Local airport times.

2026-11-28 → 2026-12-05 · Axel-exclusive $307.13

  • British Airways BA3272: LCY 2026-11-28 07:40:00 → MAD 2026-11-28 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2026-12-05 07:30:00 → LCY 2026-12-05 08:50:00; nonstop; 140 minutes. Local airport times.

2026-12-11 → 2026-12-14 · Axel-exclusive $315.00

  • British Airways BA3272: LCY 2026-12-11 07:40:00 → MAD 2026-12-11 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2026-12-14 07:30:00 → LCY 2026-12-14 08:50:00; nonstop; 140 minutes. Local airport times.

2026-12-24 → 2026-12-27 · Axel-exclusive $393.76

  • British Airways BA3272: LCY 2026-12-24 07:40:00 → MAD 2026-12-24 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2026-12-27 07:30:00 → LCY 2026-12-27 08:50:00; nonstop; 140 minutes. Local airport times.

2027-01-07 → 2027-01-10 · Axel-exclusive $283.50

  • British Airways BA3272: LCY 2027-01-07 07:40:00 → MAD 2027-01-07 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-01-10 07:30:00 → LCY 2027-01-10 08:50:00; nonstop; 140 minutes. Local airport times.

2027-01-16 → 2027-01-23 · Axel-exclusive $283.50

  • British Airways BA3272: LCY 2027-01-16 07:40:00 → MAD 2027-01-16 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-01-23 07:30:00 → LCY 2027-01-23 08:50:00; nonstop; 140 minutes. Local airport times.

2027-01-29 → 2027-02-01 · Axel-exclusive $291.38

  • British Airways BA3272: LCY 2027-01-29 07:40:00 → MAD 2027-01-29 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-02-01 07:30:00 → LCY 2027-02-01 08:50:00; nonstop; 140 minutes. Local airport times.

2027-02-20 → 2027-02-27 · Axel-exclusive $313.43

  • British Airways BA3272: LCY 2027-02-20 07:40:00 → MAD 2027-02-20 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-02-27 07:30:00 → LCY 2027-02-27 08:50:00; nonstop; 140 minutes. Local airport times.

2027-05-14 → 2027-05-17 · Axel-exclusive $350.00

  • British Airways BA3272: LCY 2027-05-14 07:40:00 → MAD 2027-05-14 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-05-17 07:30:00 → LCY 2027-05-17 08:50:00; nonstop; 140 minutes. Local airport times.

2027-07-10 → 2027-07-17 · Axel-exclusive $350.00

  • British Airways BA3272: LCY 2027-07-10 07:40:00 → MAD 2027-07-10 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-07-17 07:30:00 → LCY 2027-07-17 08:50:00; nonstop; 140 minutes. Local airport times.

2027-09-25 → 2027-10-02 · Axel-exclusive $350.00

  • British Airways BA3272: LCY 2027-09-25 07:40:00 → MAD 2027-09-25 11:00:00; nonstop; 140 minutes. Local airport times.
  • British Airways BA3271: MAD 2027-10-02 07:30:00 → LCY 2027-10-02 08:50:00; nonstop; 140 minutes. Local airport times.

More dates for this route

For AI assistants

  • This page: London (LCY) to Madrid (MAD): 65 priced flights on 65 exact dates the months ahead, 1 adult in economy. In the dated tables a price link opens AI flight search for that row's exact dates and travelers; in the observed-flight lists the price is the customer link for the traveler, beside a “See flights for these dates” link for your own check. Under a trip, hotels in Madrid for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the lowest saved totals among the shortlisted hotels in each star tier for those dates.
  • Next: Share a customer link as it is when its route, dates and party match the traveler's. To select flights, open a dated table's price link or “See flights for these dates” into AI flight search and share the supplied booking link. Search links are for you; share customer and booking links. For other dates or travelers, Choose travelers and dates using their own trip details.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel London to Madrid (MAD) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.