Travel with Axel,
get the best price.

Route overview: Washington, DC to Lisbon (LIS) flight deals

Dulles → Lisbon

Dec 21, 2026 · return Dec 23, 2026

IAD → LIS1 adulteconomyRound trip

9 flight options · 3 airlines

Nonstop flights

Mon, Dec 21 – Wed, Dec 23

TAP Air Portugal
10:30 pmIAD
7h 10m
Nonstop
10:40 am+1LIS
TAP Air Portugal
4:40 pmLIS
8h 50m
Nonstop
8:30 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
10:30 pmIAD
6h 50m
Nonstop
10:20 am+1LIS
United Airlines
11:55 amLIS
8h 20m
Nonstop
3:15 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

TAP Air Portugal
5:25 pmIAD
7h 10m
Nonstop
5:35 am+1LIS
TAP Air Portugal
4:40 pmLIS
8h 50m
Nonstop
8:30 pmIAD

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Wed, Dec 23

Air Canada
4:30 pmIAD
11h 25m
YYZ · 2h 48m
8:55 am+1LIS
Air Canada
12:50 pmLIS
12h 33m
YUL · 2h 30m
8:23 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
6:20 pmIAD
11h 45m
LHR · 1h 35m
11:05 am+1LIS
United Airlines
11:55 amLIS
8h 20m
Nonstop
3:15 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
5:15 pmIAD
11h 30m
BOS · 3h 13m
9:45 am+1LIS
United Airlines
11:55 amLIS
8h 20m
Nonstop
3:15 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
6:10 pmIAD
11h 35m
MAD · 2h 35m
10:45 am+1LIS
United Airlines
11:55 amLIS
8h 20m
Nonstop
3:15 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
5:18 pmIAD
10h 37m
YYZ · 1h 44m
8:55 am+1LIS
United Airlines
11:55 amLIS
8h 20m
Nonstop
3:15 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Wed, Dec 23

United Airlines
12:38 pmIAD
11h 47m
EWR · 3h 41m
5:25 am+1LIS
United Airlines
11:55 amLIS
8h 20m
Nonstop
3:15 pmIAD

Round-trip total · 1 adult · Taxes included

Make this trip yours

IAD ⇄ LIS

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, TAP Air Portugal 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 22, 2026Dec 22, 2026 → Dec 24, 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 Lisbon (LIS) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-23TAP Air PortugalTP234 / TP233$972.002026-10-29T01:07:18Z
2026-12-21 → 2026-12-23United AirlinesUA942 / UA943$1147.502026-10-29T01:07:18Z
2026-12-21 → 2026-12-23Air CanadaAC8619 + AC810 / AC813 + AC8725$999.002026-10-29T01:07:18Z
2026-12-21 → 2026-12-23TAP Air PortugalTP232 / TP233$972.002026-10-29T01:07:18Z
2026-12-21 → 2026-12-23United AirlinesUA918 + TP1351 / UA943$1093.502026-10-29T01:07:18Z
2026-12-21 → 2026-12-23United AirlinesUA688 + TP216 / UA943$1093.502026-10-29T01:07:18Z
2026-12-21 → 2026-12-23United AirlinesUA260 + TP1011 / UA943$1093.502026-10-29T01:07:18Z
2026-12-21 → 2026-12-23United AirlinesUA3453 + AC810 / UA943$1093.502026-10-29T01:07:18Z
2026-12-21 → 2026-12-23United AirlinesUA2823 + TP202 / UA943$1093.502026-10-29T01:07:18Z

2026-12-21 → 2026-12-23 · $972.00

  • TAP Air Portugal TP234: IAD 2026-12-21 22:30:00 → LIS 2026-12-22 10:40:00; nonstop; 430 minutes. Local airport times.
  • TAP Air Portugal TP233: LIS 2026-12-23 16:40:00 → IAD 2026-12-23 20:30:00; nonstop; 530 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $1147.50

  • United Airlines UA942: IAD 2026-12-21 22:30:00 → LIS 2026-12-22 10:20:00; nonstop; 410 minutes. Local airport times.
  • United Airlines UA943: LIS 2026-12-23 11:55:00 → IAD 2026-12-23 15:15:00; nonstop; 500 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $999.00

  • Air Canada AC8619 / AC810: IAD 2026-12-21 16:30:00 → LIS 2026-12-22 08:55:00; 1 stop(s) via YYZ; 685 minutes. Local airport times.
    • AC8619: IAD 2026-12-21 16:30:00 → YYZ 2026-12-21 17:57:00; layover at YYZ: 168 minutes.
    • AC810: YYZ 2026-12-21 20:45:00 → LIS 2026-12-22 08:55:00.
  • Air Canada AC813 / AC8725: LIS 2026-12-23 12:50:00 → IAD 2026-12-23 20:23:00; 1 stop(s) via YUL; 753 minutes. Local airport times.
    • AC813: LIS 2026-12-23 12:50:00 → YUL 2026-12-23 15:55:00; layover at YUL: 150 minutes.
    • AC8725: YUL 2026-12-23 18:25:00 → IAD 2026-12-23 20:23:00.

2026-12-21 → 2026-12-23 · $972.00

  • TAP Air Portugal TP232: IAD 2026-12-21 17:25:00 → LIS 2026-12-22 05:35:00; nonstop; 430 minutes. Local airport times.
  • TAP Air Portugal TP233: LIS 2026-12-23 16:40:00 → IAD 2026-12-23 20:30:00; nonstop; 530 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $1093.50

  • United Airlines UA918 / TP1351: IAD 2026-12-21 18:20:00 → LIS 2026-12-22 11:05:00; 1 stop(s) via LHR; 705 minutes. Local airport times.
    • UA918: IAD 2026-12-21 18:20:00 → LHR 2026-12-22 06:40:00; layover at LHR: 95 minutes.
    • TP1351: LHR 2026-12-22 08:15:00 → LIS 2026-12-22 11:05:00.
  • United Airlines UA943: LIS 2026-12-23 11:55:00 → IAD 2026-12-23 15:15:00; nonstop; 500 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $1093.50

  • United Airlines UA688 / TP216: IAD 2026-12-21 17:15:00 → LIS 2026-12-22 09:45:00; 1 stop(s) via BOS; 690 minutes. Local airport times.
    • UA688: IAD 2026-12-21 17:15:00 → BOS 2026-12-21 18:57:00; layover at BOS: 193 minutes.
    • TP216: BOS 2026-12-21 22:10:00 → LIS 2026-12-22 09:45:00.
  • United Airlines UA943: LIS 2026-12-23 11:55:00 → IAD 2026-12-23 15:15:00; nonstop; 500 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $1093.50

  • United Airlines UA260 / TP1011: IAD 2026-12-21 18:10:00 → LIS 2026-12-22 10:45:00; 1 stop(s) via MAD; 695 minutes. Local airport times.
    • UA260: IAD 2026-12-21 18:10:00 → MAD 2026-12-22 07:45:00; layover at MAD: 155 minutes.
    • TP1011: MAD 2026-12-22 10:20:00 → LIS 2026-12-22 10:45:00.
  • United Airlines UA943: LIS 2026-12-23 11:55:00 → IAD 2026-12-23 15:15:00; nonstop; 500 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $1093.50

  • United Airlines UA3453 / AC810: IAD 2026-12-21 17:18:00 → LIS 2026-12-22 08:55:00; 1 stop(s) via YYZ; 637 minutes. Local airport times.
    • UA3453: IAD 2026-12-21 17:18:00 → YYZ 2026-12-21 19:01:00; layover at YYZ: 104 minutes.
    • AC810: YYZ 2026-12-21 20:45:00 → LIS 2026-12-22 08:55:00.
  • United Airlines UA943: LIS 2026-12-23 11:55:00 → IAD 2026-12-23 15:15:00; nonstop; 500 minutes. Local airport times.

2026-12-21 → 2026-12-23 · $1093.50

  • United Airlines UA2823 / TP202: IAD 2026-12-21 12:38:00 → LIS 2026-12-22 05:25:00; 1 stop(s) via EWR; 707 minutes. Local airport times.
    • UA2823: IAD 2026-12-21 12:38:00 → EWR 2026-12-21 13:59:00; layover at EWR: 221 minutes.
    • TP202: EWR 2026-12-21 17:40:00 → LIS 2026-12-22 05:25:00.
  • United Airlines UA943: LIS 2026-12-23 11:55:00 → IAD 2026-12-23 15:15:00; nonstop; 500 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Dulles (IAD) to Lisbon (LIS) · Dec 21, 2026 · return Dec 23, 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 Lisbon (LIS) 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.