Travel with Axel,
get the best price.

Route overview: Washington, DC to Guanacaste (LIR) flight deals

Dulles → Guanacaste

Dec 4, 2026 · return Dec 9, 2026

IAD → LIR1 adulteconomyRound trip

6 flight options · 3 airlines

One-stop flights

Fri, Dec 4 – Wed, Dec 9

American Airlines
6:00 amIAD
7h 30m
CLT · 1h 22m
12:30 pmLIR
United Airlines
2:20 pmLIR
9h 17m
IAH · 2h 34m
12:37 am+1IAD

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Wed, Dec 9

United Airlines
6:10 amIAD
10h 10m
ORD · 2h 31m
3:20 pmLIR
United Airlines
2:20 pmLIR
9h 17m
IAH · 2h 34m
12:37 am+1IAD

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Wed, Dec 9

Delta Air Lines
6:00 amIAD
7h 45m
ATL · 1h 42m
12:45 pmLIR
Delta Air Lines
2:00 pmLIR
9h 36m
ATL · 3h 53m
12:36 am+1IAD

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Wed, Dec 9

American Airlines
6:01 amIAD
9h 18m
MIA · 3h 25m
2:19 pmLIR
United Airlines
2:20 pmLIR
9h 17m
IAH · 2h 34m
12:37 am+1IAD

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Wed, Dec 9

United Airlines
8:30 amIAD
11h 7m
IAH · 3h 59m
6:37 pmLIR
United Airlines
2:20 pmLIR
9h 17m
IAH · 2h 34m
12:37 am+1IAD

Round-trip total · 1 adult · Taxes included

Fri, Dec 4 – Wed, Dec 9

United Airlines
8:51 amIAD
4h 59m
Nonstop
12:50 pmLIR
United Airlines
2:20 pmLIR
9h 17m
IAH · 2h 34m
12:37 am+1IAD

Round-trip total · 1 adult · Taxes included

Make this trip yours

IAD ⇄ LIR

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, American 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 3, 2026 → Dec 8, 2026Dec 5, 2026 → Dec 10, 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.

Live price for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the flights there to get the current bookable total; the listed prices are the ones issued at the times shown.

Route overview: Washington, DC to Guanacaste (LIR) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-04 → 2026-12-09American Airlines / United AirlinesAA5649 + AA887 / UA1516 + UA750$565.002026-10-29T01:07:18Z
2026-12-04 → 2026-12-09United AirlinesUA565 + UA1120 / UA1516 + UA750$570.002026-10-29T01:07:18Z
2026-12-04 → 2026-12-09Delta Air LinesDL2327 + DL1898 / DL1820 + DL2549$590.002026-10-29T01:07:18Z
2026-12-04 → 2026-12-09American Airlines / United AirlinesAA552 + AA1383 / UA1516 + UA750$565.002026-10-29T01:07:18Z
2026-12-04 → 2026-12-09United AirlinesUA1524 + UA1737 / UA1516 + UA750$570.002026-10-29T01:07:18Z
2026-12-04 → 2026-12-09United AirlinesUA1547 / UA1516 + UA750$615.002026-10-29T01:07:18Z

2026-12-04 → 2026-12-09 · $565.00

  • American Airlines AA5649 / AA887: IAD 2026-12-04 06:00:00 → LIR 2026-12-04 12:30:00; 1 stop(s) via CLT; 450 minutes. Local airport times.
    • AA5649: IAD 2026-12-04 06:00:00 → CLT 2026-12-04 07:48:00; layover at CLT: 82 minutes.
    • AA887: CLT 2026-12-04 09:10:00 → LIR 2026-12-04 12:30:00.
  • United Airlines UA1516 / UA750: LIR 2026-12-09 14:20:00 → IAD 2026-12-10 00:37:00; 1 stop(s) via IAH; 557 minutes. Local airport times.
    • UA1516: LIR 2026-12-09 14:20:00 → IAH 2026-12-09 18:04:00; layover at IAH: 154 minutes.
    • UA750: IAH 2026-12-09 20:38:00 → IAD 2026-12-10 00:37:00.

2026-12-04 → 2026-12-09 · $570.00

  • United Airlines UA565 / UA1120: IAD 2026-12-04 06:10:00 → LIR 2026-12-04 15:20:00; 1 stop(s) via ORD; 610 minutes. Local airport times.
    • UA565: IAD 2026-12-04 06:10:00 → ORD 2026-12-04 07:32:00; layover at ORD: 151 minutes.
    • UA1120: ORD 2026-12-04 10:03:00 → LIR 2026-12-04 15:20:00.
  • United Airlines UA1516 / UA750: LIR 2026-12-09 14:20:00 → IAD 2026-12-10 00:37:00; 1 stop(s) via IAH; 557 minutes. Local airport times.
    • UA1516: LIR 2026-12-09 14:20:00 → IAH 2026-12-09 18:04:00; layover at IAH: 154 minutes.
    • UA750: IAH 2026-12-09 20:38:00 → IAD 2026-12-10 00:37:00.

2026-12-04 → 2026-12-09 · $590.00

  • Delta Air Lines DL2327 / DL1898: IAD 2026-12-04 06:00:00 → LIR 2026-12-04 12:45:00; 1 stop(s) via ATL; 465 minutes. Local airport times.
    • DL2327: IAD 2026-12-04 06:00:00 → ATL 2026-12-04 07:58:00; layover at ATL: 102 minutes.
    • DL1898: ATL 2026-12-04 09:40:00 → LIR 2026-12-04 12:45:00.
  • Delta Air Lines DL1820 / DL2549: LIR 2026-12-09 14:00:00 → IAD 2026-12-10 00:36:00; 1 stop(s) via ATL; 576 minutes. Local airport times.
    • DL1820: LIR 2026-12-09 14:00:00 → ATL 2026-12-09 19:02:00; layover at ATL: 233 minutes.
    • DL2549: ATL 2026-12-09 22:55:00 → IAD 2026-12-10 00:36:00.

2026-12-04 → 2026-12-09 · $565.00

  • American Airlines AA552 / AA1383: IAD 2026-12-04 06:01:00 → LIR 2026-12-04 14:19:00; 1 stop(s) via MIA; 558 minutes. Local airport times.
    • AA552: IAD 2026-12-04 06:01:00 → MIA 2026-12-04 08:50:00; layover at MIA: 205 minutes.
    • AA1383: MIA 2026-12-04 12:15:00 → LIR 2026-12-04 14:19:00.
  • United Airlines UA1516 / UA750: LIR 2026-12-09 14:20:00 → IAD 2026-12-10 00:37:00; 1 stop(s) via IAH; 557 minutes. Local airport times.
    • UA1516: LIR 2026-12-09 14:20:00 → IAH 2026-12-09 18:04:00; layover at IAH: 154 minutes.
    • UA750: IAH 2026-12-09 20:38:00 → IAD 2026-12-10 00:37:00.

2026-12-04 → 2026-12-09 · $570.00

  • United Airlines UA1524 / UA1737: IAD 2026-12-04 08:30:00 → LIR 2026-12-04 18:37:00; 1 stop(s) via IAH; 667 minutes. Local airport times.
    • UA1524: IAD 2026-12-04 08:30:00 → IAH 2026-12-04 11:06:00; layover at IAH: 239 minutes.
    • UA1737: IAH 2026-12-04 15:05:00 → LIR 2026-12-04 18:37:00.
  • United Airlines UA1516 / UA750: LIR 2026-12-09 14:20:00 → IAD 2026-12-10 00:37:00; 1 stop(s) via IAH; 557 minutes. Local airport times.
    • UA1516: LIR 2026-12-09 14:20:00 → IAH 2026-12-09 18:04:00; layover at IAH: 154 minutes.
    • UA750: IAH 2026-12-09 20:38:00 → IAD 2026-12-10 00:37:00.

2026-12-04 → 2026-12-09 · $615.00

  • United Airlines UA1547: IAD 2026-12-04 08:51:00 → LIR 2026-12-04 12:50:00; nonstop; 299 minutes. Local airport times.
  • United Airlines UA1516 / UA750: LIR 2026-12-09 14:20:00 → IAD 2026-12-10 00:37:00; 1 stop(s) via IAH; 557 minutes. Local airport times.
    • UA1516: LIR 2026-12-09 14:20:00 → IAH 2026-12-09 18:04:00; layover at IAH: 154 minutes.
    • UA750: IAH 2026-12-09 20:38:00 → IAD 2026-12-10 00:37:00.

Explore this route

For AI assistants

  • This page: Dulles (IAD) to Guanacaste (LIR) · Dec 4, 2026 · return Dec 9, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
  • 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 Washington, DC to Guanacaste (LIR) 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. Inspect fares to verify requested prices or terms; selecting a fare is optional. Use that fare’s booking link to preserve its Membership price basis. State anything unverified. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and explain what remains unresolved. Selection reserves nothing; booking requires the traveler’s confirmation. 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.